diff --git a/.github/workflows/e2e-datasets.yml b/.github/workflows/e2e-datasets.yml
new file mode 100644
index 000000000..4d6f01351
--- /dev/null
+++ b/.github/workflows/e2e-datasets.yml
@@ -0,0 +1,28 @@
+# A cache saved by a pull request run is only visible to that pull request.
+# One saved on main is visible to all of them, so this keeps it there.
+name: E2E dataset cache
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  warm:
+    runs-on: ubuntu-latest
+    name: Warm the dataset cache
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+      # Keep in step with the cache step in e2e.yml.
+      - name: Cache test datasets
+        uses: actions/cache@v4
+        with:
+          path: .tmp/datasets
+          key: e2e-datasets-${{ hashFiles('tests/datasets.ts') }}
+          restore-keys: e2e-datasets-
+      - name: Download missing datasets
+        run: node tests/downloadDatasets.ts
diff --git a/.github/workflows/e2e.yml b/.github/workflows/e2e.yml
index 4993780ad..f540f0e1b 100644
--- a/.github/workflows/e2e.yml
+++ b/.github/workflows/e2e.yml
@@ -29,6 +29,12 @@ jobs:
         run: npm ci
         env:
           DETECT_CHROMEDRIVER_VERSION: true
+      - name: Cache test datasets
+        uses: actions/cache@v4
+        with:
+          path: .tmp/datasets
+          key: e2e-datasets-${{ hashFiles('tests/datasets.ts') }}
+          restore-keys: e2e-datasets-
       - name: Install xvfb (linux)
         if: matrix.os == 'ubuntu-latest'
         run: sudo apt-get install xvfb
diff --git a/eslint.config.js b/eslint.config.js
index 287844321..78aaaeafc 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -84,6 +84,38 @@ const featureBoundaries = (features) => {
   ];
 };
 
+// Files that still pass their own time limits. Remove a file once it is
+// clean; never add one.
+const E2E_TIMEOUT_DEBT = [
+  'tests/pageobjects/volview.page.ts',
+  'tests/specs/annotationTestUtils.ts',
+  'tests/specs/automatic-layering.e2e.ts',
+  'tests/specs/bug-report.e2e.ts',
+  'tests/specs/cine-drag-onto-slot.e2e.ts',
+  'tests/specs/cine-rendering.e2e.ts',
+  'tests/specs/cine-ruler-session.e2e.ts',
+  'tests/specs/crosshairs-multi-image.e2e.ts',
+  'tests/specs/delete-selected-annotation.e2e.ts',
+  'tests/specs/dicom-dimension-mismatch.e2e.ts',
+  'tests/specs/different-direction-labelmap.e2e.ts',
+  'tests/specs/imageCacheUtils.ts',
+  'tests/specs/layer-source-lifetime.e2e.ts',
+  'tests/specs/layers-and-rendering.e2e.ts',
+  'tests/specs/multi-series-load.e2e.ts',
+  'tests/specs/paint-tool-rendering.e2e.ts',
+  'tests/specs/polygon-nested-interaction.e2e.ts',
+  'tests/specs/sample-rendering.e2e.ts',
+  'tests/specs/save-large-labelmap.e2e.ts',
+  'tests/specs/seg-nrrd-export.e2e.ts',
+  'tests/specs/select-annotation-at-press.e2e.ts',
+  'tests/specs/select-tool-annotation-press.e2e.ts',
+  'tests/specs/session-large-uri-base.e2e.ts',
+  'tests/specs/sparse-manifest-prostate-rectangle.e2e.ts',
+  'tests/specs/sparse-manifest.e2e.ts',
+  'tests/specs/ultrasound-spacing.e2e.ts',
+  'tests/specs/vtk-interactor-lifecycle.e2e.ts',
+];
+
 export default tseslint.config(
   {
     ignores: [
@@ -142,6 +174,27 @@ export default tseslint.config(
       'class-methods-use-this': 'off',
     },
   },
+  // A wait with its own time limit stands in for a state the app should
+  // publish, and fails on a slow machine. Wait on the state instead.
+  {
+    files: ['**/tests/specs/**/*.ts', '**/tests/pageobjects/**/*.ts'],
+    ignores: E2E_TIMEOUT_DEBT,
+    rules: {
+      'no-restricted-syntax': [
+        'error',
+        {
+          selector: "Property[key.name='timeout']",
+          message:
+            'Wait for a state the page publishes rather than passing a timeout.',
+        },
+        {
+          selector:
+            "CallExpression[callee.object.name='browser'][callee.property.name='pause']",
+          message: 'Wait for a state the page publishes rather than pausing.',
+        },
+      ],
+    },
+  },
   {
     files: ['**/__tests__/*.{js,ts}', '**/tests/unit/**/*.spec.{js,ts}'],
     languageOptions: {
diff --git a/index.html b/index.html
index eda9801e8..d460585dc 100644
--- a/index.html
+++ b/index.html
@@ -6,14 +6,6 @@
     <meta name="viewport" content="width=device-width,initial-scale=1.0" />
     <link rel="icon" href="/favicon.ico" />
     <title>VolView</title>
-    <link
-      rel="stylesheet"
-      href="https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,700,900"
-    />
-    <link
-      rel="stylesheet"
-      href="https://cdn.jsdelivr.net/npm/@mdi/font@latest/css/materialdesignicons.min.css"
-    />
   </head>
   <body>
     <noscript>
diff --git a/package-lock.json b/package-lock.json
index db7f994ac..9b8ba4996 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,10 +11,12 @@
         "@commitlint/cli": "^21.0.0",
         "@commitlint/config-conventional": "^21.0.0",
         "@eslint/js": "^9.39.1",
+        "@fontsource/roboto": "^5.3.0",
         "@itk-wasm/dicom": "^7.6.4",
         "@itk-wasm/image-io": "1.6.1",
         "@itk-wasm/morphological-contour-interpolation": "2.0.0",
         "@kitware/vtk.js": "^37.0.4",
+        "@mdi/font": "^7.4.47",
         "@netlify/edge-functions": "^3.0.2",
         "@rollup/plugin-replace": "^6.0.3",
         "@sentry/vite-plugin": "^4.6.1",
@@ -1735,6 +1737,16 @@
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       }
     },
+    "node_modules/@fontsource/roboto": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/@fontsource/roboto/-/roboto-5.3.0.tgz",
+      "integrity": "sha512-BapRJOWYP+LZ21zp+wBQjfpPYKRoxc4LspJ/RLuI+HSMBD5u/X4O+ESDrSvEqDSy0rAl7GwBJ+09mdc16cVQ1Q==",
+      "dev": true,
+      "license": "OFL-1.1",
+      "funding": {
+        "url": "https://github.com/sponsors/ayuhito"
+      }
+    },
     "node_modules/@humanfs/core": {
       "version": "0.19.2",
       "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.2.tgz",
@@ -2664,6 +2676,13 @@
         "wslink": ">=2.0.0"
       }
     },
+    "node_modules/@mdi/font": {
+      "version": "7.4.47",
+      "resolved": "https://registry.npmjs.org/@mdi/font/-/font-7.4.47.tgz",
+      "integrity": "sha512-43MtGpd585SNzHZPcYowu/84Vz2a2g31TvPMTm9uTiCSWzaheQySUcSyUH/46fPnuPQWof2yd0pGBtzee/IQWw==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
     "node_modules/@msgpack/msgpack": {
       "version": "2.8.0",
       "resolved": "https://registry.npmjs.org/@msgpack/msgpack/-/msgpack-2.8.0.tgz",
diff --git a/package.json b/package.json
index df82796ee..9fd4d0a52 100644
--- a/package.json
+++ b/package.json
@@ -37,10 +37,12 @@
     "@commitlint/cli": "^21.0.0",
     "@commitlint/config-conventional": "^21.0.0",
     "@eslint/js": "^9.39.1",
+    "@fontsource/roboto": "^5.3.0",
     "@itk-wasm/dicom": "^7.6.4",
     "@itk-wasm/image-io": "1.6.1",
     "@itk-wasm/morphological-contour-interpolation": "2.0.0",
     "@kitware/vtk.js": "^37.0.4",
+    "@mdi/font": "^7.4.47",
     "@netlify/edge-functions": "^3.0.2",
     "@rollup/plugin-replace": "^6.0.3",
     "@sentry/vite-plugin": "^4.6.1",
diff --git a/src/main.js b/src/main.js
index 016aef90f..ea872828d 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,3 +1,10 @@
+import '@fontsource/roboto/100.css';
+import '@fontsource/roboto/300.css';
+import '@fontsource/roboto/400.css';
+import '@fontsource/roboto/500.css';
+import '@fontsource/roboto/700.css';
+import '@fontsource/roboto/900.css';
+import '@mdi/font/css/materialdesignicons.min.css';
 import 'vue-toastification/dist/index.css';
 import 'vuetify/lib/styles/main.css';
 import '@/src/global.css';
diff --git a/tests/datasets.ts b/tests/datasets.ts
new file mode 100644
index 000000000..b480aa636
--- /dev/null
+++ b/tests/datasets.ts
@@ -0,0 +1,105 @@
+// Every file the suite fetches from the internet. The runner downloads them
+// into the dataset cache before any spec starts, and specs read them from the
+// local server at `/tmp/<name>`. CI keys its dataset cache on this file.
+//
+// The files are assets of one GitHub release. An asset can be replaced after
+// it is published, so each download is checked against its hash. To change or
+// add a file, publish a new release and point DATASET_RELEASE at it.
+export const DATASET_RELEASE =
+  'https://github.com/Kitware/VolView/releases/download/test-data-1';
+
+// `origin` is where the file was first published.
+const DATASETS = {
+  ONE_CT_SLICE_DICOM: {
+    name: 'CT000085.dcm',
+    origin:
+      'https://data.kitware.com/api/v1/file/6566aa81c5a2b36857ad1783/download',
+    sha256: '8c9c3477a3bcf54477f7705c9f60ec2473699b8ac93a11f00332873c1dde6b9b',
+  },
+  MINIMAL_DICOM: {
+    name: 'minimal.dcm',
+    origin:
+      'https://data.kitware.com/api/v1/file/68e9807dbf0f869935e36481/download',
+    sha256: 'c0d05d47b16cbc2e1a913c5b1dc1b5c982eb8499f7674c2e5933a81d5ab878a1',
+  },
+  MINIMAL_501_SESSION: {
+    name: 'minimal-501-session.volview.zip',
+    origin:
+      'https://data.kitware.com/api/v1/file/693077d880eaefe49a4abb88/download',
+    sha256: 'e2dded0c7bcabae6611e4bcc7e0170e2902640624de60043aa6d363630844d7d',
+  },
+  PROSTATEX_DATASET: {
+    name: 'prostate.zip',
+    origin:
+      'https://data.kitware.com/api/v1/item/63527c7311dab8142820a338/download',
+    sha256: '2db4738cc063f80eaaeffd52b83271dca1e3543518a54240c01e5ba2d5629dd1',
+  },
+  PROSTATE_SEGMENT_GROUP: {
+    name: 'prostate-total.seg.nii.gz',
+    origin:
+      'https://data.kitware.com/api/v1/file/692f13ed80eaefe49a4abb72/download',
+    sha256: '30704eab70795d242f529c63c467867f7ac5256a8bf50af28a272bc6c866f394',
+  },
+  MRA_HEAD_NECK_DATASET: {
+    name: 'MRA-Head_and_Neck.zip',
+    origin:
+      'https://data.kitware.com/api/v1/item/6352a2b311dab8142820a33b/download',
+    sha256: 'd1d692f449e94294f1204040c43aa313b84fb4d6be9eb4c8558f78435126f875',
+  },
+  FETUS_DATASET: {
+    name: 'fetus.zip',
+    origin:
+      'https://data.kitware.com/api/v1/item/635679c311dab8142820a4f4/download',
+    sha256: '3cf89e3d24dfaaea61b006e797df6976a8b2e94a63637e34e16c3608d6e19464',
+  },
+  // Multiframe ultrasound DICOM from pydicom public test data.
+  // SequenceOfUltrasoundRegions: PhysicalDeltaX/Y = 0.05104970559 cm/pixel
+  // (unit code 3 = cm), so with US spacing fix the VTK spacing is ~0.5105 mm.
+  US_MULTIFRAME_DICOM: {
+    name: 'US_multiframe_30frames.dcm',
+    origin:
+      'https://data.kitware.com/api/v1/file/69e1630646ef98a20f563020/download',
+    sha256: '6fa3a087d3c631b43216a8abec8aac8d2d73751c5bf5885708d1150b09283f72',
+  },
+  // 8-frame echocardiogram from the BSD-licensed GDCM test corpus. Native
+  // Explicit VR LE, MONOCHROME2, retired Ultrasound Multi-frame SOP UID.
+  CINE_US_DATASET: {
+    name: 'US-MONO2-8-8x-echo.dcm',
+    origin:
+      'https://sourceforge.net/p/gdcm/gdcmdata/ci/master/tree/US-MONO2-8-8x-execho.dcm?format=raw',
+    sha256: '7d3f54806d0315c6cfc8b7371649a242b5ef8f31e0d20221971dd8087f2ff1ea',
+  },
+  // 120-frame RGB ultrasound cine encoded as JPEG Baseline. Exercises the async
+  // browser JPEG decode path used by common compressed ultrasound clips.
+  COLOR3D_JPEG_BASELINE_DICOM: {
+    name: 'color3d_jpeg_baseline.dcm',
+    origin:
+      'https://raw.githubusercontent.com/pydicom/pydicom-data/master/data_store/data/color3d_jpeg_baseline.dcm',
+    sha256: 'c8798b8abf8ae0a18e8c9952e7c7f75f3cc8465234b1b63f9e3ba3bebb9d5625',
+  },
+  CT_ELECTRODES: {
+    name: 'CT_Electrodes.nii.gz',
+    origin:
+      'https://raw.githubusercontent.com/neurolabusc/niivue-images/main/CT_Electrodes.nii.gz',
+    sha256: '0566942708ff451458d0fdb1f61c4611187bb5cc0efa516c8500f1ff3c142e57',
+  },
+} as const;
+
+export const {
+  ONE_CT_SLICE_DICOM,
+  MINIMAL_DICOM,
+  MINIMAL_501_SESSION,
+  PROSTATEX_DATASET,
+  PROSTATE_SEGMENT_GROUP,
+  MRA_HEAD_NECK_DATASET,
+  FETUS_DATASET,
+  US_MULTIFRAME_DICOM,
+  CINE_US_DATASET,
+  COLOR3D_JPEG_BASELINE_DICOM,
+  CT_ELECTRODES,
+} = DATASETS;
+
+// Everything declared above is downloaded.
+export const TEST_DATASETS = Object.values(DATASETS);
+
+export type TestDataset = (typeof TEST_DATASETS)[number];
diff --git a/tests/downloadDatasets.ts b/tests/downloadDatasets.ts
new file mode 100644
index 000000000..eec42328e
--- /dev/null
+++ b/tests/downloadDatasets.ts
@@ -0,0 +1,64 @@
+import * as fs from 'node:fs';
+import * as path from 'node:path';
+import { createHash } from 'node:crypto';
+import { fileURLToPath } from 'node:url';
+import {
+  DATASET_RELEASE,
+  TEST_DATASETS,
+  type TestDataset,
+} from './datasets.ts';
+import { projectRoot } from './e2eTestUtils.ts';
+
+// Node built-ins only, so CI can warm the dataset cache by running this file
+// with node, without installing dependencies.
+
+// Kept across runs, and across CI runs by the workflow cache.
+export const DATASET_CACHE = path.resolve(projectRoot(), '.tmp/datasets');
+
+const sha256 = (data: Buffer) =>
+  createHash('sha256').update(data).digest('hex');
+
+async function fetchDataset(dataset: TestDataset) {
+  const url = `${DATASET_RELEASE}/${dataset.name}`;
+  const fail = (reason: string) =>
+    new Error(
+      `Could not download test dataset ${dataset.name} from ${url}: ${reason}`
+    );
+
+  const response = await fetch(url).catch((err: Error) => {
+    throw fail(err.message);
+  });
+  if (!response.ok) throw fail(`HTTP ${response.status}`);
+
+  const data = Buffer.from(await response.arrayBuffer());
+  const actual = sha256(data);
+  if (actual !== dataset.sha256) {
+    throw fail(`sha256 is ${actual}, expected ${dataset.sha256}`);
+  }
+  return data;
+}
+
+/**
+ * The only place the suite reaches the internet. One attempt per file: a slow
+ * or missing host stops here and never shows up as a failing spec.
+ */
+export async function downloadDatasets() {
+  fs.mkdirSync(DATASET_CACHE, { recursive: true });
+  await Promise.all(
+    TEST_DATASETS.map(async (dataset) => {
+      const savePath = path.join(DATASET_CACHE, dataset.name);
+      // A cached file is only good while it is the file this checkout names.
+      const cached =
+        fs.existsSync(savePath) &&
+        sha256(fs.readFileSync(savePath)) === dataset.sha256;
+      if (cached) return;
+      // Rename into place so an interrupted write never looks cached.
+      fs.writeFileSync(`${savePath}.part`, await fetchDataset(dataset));
+      fs.renameSync(`${savePath}.part`, savePath);
+    })
+  );
+}
+
+if (process.argv[1] === fileURLToPath(import.meta.url)) {
+  await downloadDatasets();
+}
diff --git a/tests/fixtures/layer-axial.5-0-1.volview.json b/tests/fixtures/layer-axial.5-0-1.volview.json
index 2a83b40ce..da7ca7a0d 100644
--- a/tests/fixtures/layer-axial.5-0-1.volview.json
+++ b/tests/fixtures/layer-axial.5-0-1.volview.json
@@ -1 +1 @@
-{"version":"5.0.1","datasets":[{"id":"1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922","dataSourceId":1},{"id":"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144","dataSourceId":22}],"dataSources":[{"id":2,"type":"uri","name":"MRI-PROSTATEx-0004.zip","uri":"https://data.kitware.com/api/v1/item/63527c7311dab8142820a338/download"},{"id":3,"type":"archive","path":"MRI-PROSTATEx-0004/1-19.dcm","parent":2},{"id":4,"type":"archive","path":"MRI-PROSTATEx-0004/1-18.dcm","parent":2},{"id":5,"type":"archive","path":"MRI-PROSTATEx-0004/1-17.dcm","parent":2},{"id":6,"type":"archive","path":"MRI-PROSTATEx-0004/1-16.dcm","parent":2},{"id":7,"type":"archive","path":"MRI-PROSTATEx-0004/1-15.dcm","parent":2},{"id":8,"type":"archive","path":"MRI-PROSTATEx-0004/1-14.dcm","parent":2},{"id":9,"type":"archive","path":"MRI-PROSTATEx-0004/1-13.dcm","parent":2},{"id":10,"type":"archive","path":"MRI-PROSTATEx-0004/1-12.dcm","parent":2},{"id":11,"type":"archive","path":"MRI-PROSTATEx-0004/1-11.dcm","parent":2},{"id":12,"type":"archive","path":"MRI-PROSTATEx-0004/1-10.dcm","parent":2},{"id":13,"type":"archive","path":"MRI-PROSTATEx-0004/1-09.dcm","parent":2},{"id":14,"type":"archive","path":"MRI-PROSTATEx-0004/1-08.dcm","parent":2},{"id":15,"type":"archive","path":"MRI-PROSTATEx-0004/1-07.dcm","parent":2},{"id":16,"type":"archive","path":"MRI-PROSTATEx-0004/1-06.dcm","parent":2},{"id":17,"type":"archive","path":"MRI-PROSTATEx-0004/1-05.dcm","parent":2},{"id":18,"type":"archive","path":"MRI-PROSTATEx-0004/1-04.dcm","parent":2},{"id":19,"type":"archive","path":"MRI-PROSTATEx-0004/1-03.dcm","parent":2},{"id":20,"type":"archive","path":"MRI-PROSTATEx-0004/1-02.dcm","parent":2},{"id":21,"type":"archive","path":"MRI-PROSTATEx-0004/1-01.dcm","parent":2},{"id":1,"type":"collection","sources":[3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]},{"id":23,"type":"uri","name":"MRA-Head_and_Neck.zip","uri":"https://data.kitware.com/api/v1/item/6352a2b311dab8142820a33b/download"},{"id":24,"type":"archive","path":"MRA-Head_and_Neck/4016","parent":23},{"id":25,"type":"archive","path":"MRA-Head_and_Neck/4046","parent":23},{"id":26,"type":"archive","path":"MRA-Head_and_Neck/3956","parent":23},{"id":27,"type":"archive","path":"MRA-Head_and_Neck/3986","parent":23},{"id":28,"type":"archive","path":"MRA-Head_and_Neck/3925","parent":23},{"id":29,"type":"archive","path":"MRA-Head_and_Neck/25492","parent":23},{"id":30,"type":"archive","path":"MRA-Head_and_Neck/25432","parent":23},{"id":31,"type":"archive","path":"MRA-Head_and_Neck/25402","parent":23},{"id":32,"type":"archive","path":"MRA-Head_and_Neck/25462","parent":23},{"id":33,"type":"archive","path":"MRA-Head_and_Neck/25372","parent":23},{"id":34,"type":"archive","path":"MRA-Head_and_Neck/25312","parent":23},{"id":35,"type":"archive","path":"MRA-Head_and_Neck/25342","parent":23},{"id":36,"type":"archive","path":"MRA-Head_and_Neck/25282","parent":23},{"id":37,"type":"archive","path":"MRA-Head_and_Neck/25252","parent":23},{"id":38,"type":"archive","path":"MRA-Head_and_Neck/25162","parent":23},{"id":39,"type":"archive","path":"MRA-Head_and_Neck/25222","parent":23},{"id":40,"type":"archive","path":"MRA-Head_and_Neck/25132","parent":23},{"id":41,"type":"archive","path":"MRA-Head_and_Neck/25102","parent":23},{"id":42,"type":"archive","path":"MRA-Head_and_Neck/25072","parent":23},{"id":43,"type":"archive","path":"MRA-Head_and_Neck/25042","parent":23},{"id":44,"type":"archive","path":"MRA-Head_and_Neck/24892","parent":23},{"id":45,"type":"archive","path":"MRA-Head_and_Neck/24952","parent":23},{"id":46,"type":"archive","path":"MRA-Head_and_Neck/25012","parent":23},{"id":47,"type":"archive","path":"MRA-Head_and_Neck/24922","parent":23},{"id":48,"type":"archive","path":"MRA-Head_and_Neck/24982","parent":23},{"id":49,"type":"archive","path":"MRA-Head_and_Neck/24742","parent":23},{"id":50,"type":"archive","path":"MRA-Head_and_Neck/24802","parent":23},{"id":51,"type":"archive","path":"MRA-Head_and_Neck/24832","parent":23},{"id":52,"type":"archive","path":"MRA-Head_and_Neck/24772","parent":23},{"id":53,"type":"archive","path":"MRA-Head_and_Neck/24201","parent":23},{"id":54,"type":"archive","path":"MRA-Head_and_Neck/23570","parent":23},{"id":55,"type":"archive","path":"MRA-Head_and_Neck/24531","parent":23},{"id":56,"type":"archive","path":"MRA-Head_and_Neck/23871","parent":23},{"id":57,"type":"archive","path":"MRA-Head_and_Neck/22549","parent":23},{"id":58,"type":"archive","path":"MRA-Head_and_Neck/23240","parent":23},{"id":59,"type":"archive","path":"MRA-Head_and_Neck/22910","parent":23},{"id":60,"type":"archive","path":"MRA-Head_and_Neck/22008","parent":23},{"id":61,"type":"archive","path":"MRA-Head_and_Neck/22338","parent":23},{"id":62,"type":"archive","path":"MRA-Head_and_Neck/21348","parent":23},{"id":63,"type":"archive","path":"MRA-Head_and_Neck/21678","parent":23},{"id":64,"type":"archive","path":"MRA-Head_and_Neck/21048","parent":23},{"id":65,"type":"archive","path":"MRA-Head_and_Neck/20718","parent":23},{"id":66,"type":"archive","path":"MRA-Head_and_Neck/20388","parent":23},{"id":67,"type":"archive","path":"MRA-Head_and_Neck/20117","parent":23},{"id":68,"type":"archive","path":"MRA-Head_and_Neck/19817","parent":23},{"id":69,"type":"archive","path":"MRA-Head_and_Neck/19127","parent":23},{"id":70,"type":"archive","path":"MRA-Head_and_Neck/17860","parent":23},{"id":71,"type":"archive","path":"MRA-Head_and_Neck/19457","parent":23},{"id":72,"type":"archive","path":"MRA-Head_and_Neck/18797","parent":23},{"id":73,"type":"archive","path":"MRA-Head_and_Neck/18196","parent":23},{"id":74,"type":"archive","path":"MRA-Head_and_Neck/18466","parent":23},{"id":75,"type":"archive","path":"MRA-Head_and_Neck/15910","parent":23},{"id":76,"type":"archive","path":"MRA-Head_and_Neck/16870","parent":23},{"id":77,"type":"archive","path":"MRA-Head_and_Neck/16180","parent":23},{"id":78,"type":"archive","path":"MRA-Head_and_Neck/17530","parent":23},{"id":79,"type":"archive","path":"MRA-Head_and_Neck/16540","parent":23},{"id":80,"type":"archive","path":"MRA-Head_and_Neck/17200","parent":23},{"id":81,"type":"archive","path":"MRA-Head_and_Neck/15640","parent":23},{"id":82,"type":"archive","path":"MRA-Head_and_Neck/15310","parent":23},{"id":83,"type":"archive","path":"MRA-Head_and_Neck/14980","parent":23},{"id":84,"type":"archive","path":"MRA-Head_and_Neck/14320","parent":23},{"id":85,"type":"archive","path":"MRA-Head_and_Neck/14080","parent":23},{"id":86,"type":"archive","path":"MRA-Head_and_Neck/14650","parent":23},{"id":87,"type":"archive","path":"MRA-Head_and_Neck/13419","parent":23},{"id":88,"type":"archive","path":"MRA-Head_and_Neck/13750","parent":23},{"id":89,"type":"archive","path":"MRA-Head_and_Neck/12759","parent":23},{"id":90,"type":"archive","path":"MRA-Head_and_Neck/13089","parent":23},{"id":91,"type":"archive","path":"MRA-Head_and_Neck/12128","parent":23},{"id":92,"type":"archive","path":"MRA-Head_and_Neck/12458","parent":23},{"id":93,"type":"archive","path":"MRA-Head_and_Neck/11827","parent":23},{"id":94,"type":"archive","path":"MRA-Head_and_Neck/11497","parent":23},{"id":95,"type":"archive","path":"MRA-Head_and_Neck/11167","parent":23},{"id":96,"type":"archive","path":"MRA-Head_and_Neck/10866","parent":23},{"id":97,"type":"archive","path":"MRA-Head_and_Neck/9215","parent":23},{"id":98,"type":"archive","path":"MRA-Head_and_Neck/9875","parent":23},{"id":99,"type":"archive","path":"MRA-Head_and_Neck/10536","parent":23},{"id":100,"type":"archive","path":"MRA-Head_and_Neck/10206","parent":23},{"id":101,"type":"archive","path":"MRA-Head_and_Neck/9545","parent":23},{"id":102,"type":"archive","path":"MRA-Head_and_Neck/8885","parent":23},{"id":103,"type":"archive","path":"MRA-Head_and_Neck/7895","parent":23},{"id":104,"type":"archive","path":"MRA-Head_and_Neck/8555","parent":23},{"id":105,"type":"archive","path":"MRA-Head_and_Neck/8225","parent":23},{"id":106,"type":"archive","path":"MRA-Head_and_Neck/7565","parent":23},{"id":22,"type":"collection","sources":[24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106]}],"datasetFilePath":{},"labelMaps":[],"tools":{"crosshairs":{"position":[0,0,0]},"paint":{"activeSegmentGroupID":null,"activeSegment":null,"brushSize":4,"crossPlaneSync":false},"crop":{"1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922":{"Sagittal":[-0.5,383.5],"Coronal":[-0.5,383.5],"Axial":[-0.5,18.5]},"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144":{"Sagittal":[-0.5,511.5],"Coronal":[-0.5,511.5],"Axial":[-0.5,82.5]}},"current":"WindowLevel","polygons":{"tools":[],"labels":{"1":{"labelName":"Label 1","color":"red","strokeWidth":1}}},"rectangles":{"tools":[],"labels":{"3":{"labelName":"Label 1","color":"red","strokeWidth":1,"fillColor":"transparent"}}},"rulers":{"tools":[],"labels":{"2":{"labelName":"Label 1","color":"red","strokeWidth":1}}}},"layout":{"name":"Axial Only","direction":"H","items":["Axial"]},"views":[{"id":"Coronal","type":"2D","props":{"viewDirection":"Posterior","viewUp":"Superior"},"config":{"1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922":{"slice":{"slice":192,"min":0,"max":383,"axisDirection":"Posterior","syncState":false},"window":{"auto":"FullRange","useAuto":false,"width":1120,"level":549},"camera":{"position":[-22.163253907287167,-564.594223248674,174.1187338921456],"focalPoint":[-22.163253784231358,17.55373397057385,28.972948296001235],"viewUp":[1.4080733262381892e-17,0.24192188680171967,0.9702957272529602],"parallelScale":101.92947988832593,"directionOfProjection":[2.0510340073149801e-10,0.9702957270336714,-0.2419218925608004]}},"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144":{"slice":{"slice":256,"min":0,"max":511,"axisDirection":"Posterior","syncState":false},"window":{"auto":"FullRange","useAuto":false,"userTriggered":true,"width":81,"level":46},"camera":{"position":[-0.7825957138099202,-582.9333614467896,-5.548833820787268],"focalPoint":[-1.4482100259604564,-1.1179264052817643,-1.9742063331270465],"viewUp":[0.0013390391832217574,-0.00614239601418376,1.000001311302185],"parallelScale":106.17654155033951,"directionOfProjection":[-0.0011440076597175992,0.9999804722932084,0.0061438000233316895]}}}},{"id":"Sagittal","type":"2D","props":{"viewDirection":"Right","viewUp":"Superior"},"config":{"1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922":{"slice":{"slice":192,"min":0,"max":383,"axisDirection":"Right","syncState":false},"window":{"auto":"FullRange","useAuto":false,"width":1120,"level":549},"camera":{"position":[577.8063647556294,17.5537338511733,28.972948325771128],"focalPoint":[-22.163253784231358,17.55373397057385,28.972948296001235],"viewUp":[1.4080733262381892e-17,0.24192188680171967,0.9702957272529602],"parallelScale":101.92947988832593,"directionOfProjection":[-1,1.99010999481902e-10,-4.961900119157013e-11]}},"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144":{"slice":{"slice":256,"min":0,"max":511,"axisDirection":"Right","syncState":false},"window":{"auto":"FullRange","useAuto":false,"userTriggered":true,"width":81,"level":46},"camera":{"position":[580.3672250155474,-0.44754120656388774,-2.7491612199849333],"focalPoint":[-1.4482100259604564,-1.1179264052817643,-1.9742063331270465],"viewUp":[0.0013390391832217574,-0.00614239601418376,1.000001311302185],"parallelScale":106.17654155033951,"directionOfProjection":[-0.9999984491279005,-0.001152228213038641,0.0013319579343003985]}}}},{"id":"Axial","type":"2D","props":{"viewDirection":"Superior","viewUp":"Anterior"},"config":{"1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922":{"slice":{"slice":9,"min":0,"max":18,"axisDirection":"Superior","syncState":false},"window":{"auto":"FullRange","useAuto":false,"width":1120,"level":549},"camera":{"position":[-22.163253784231365,-127.59204817029726,-553.175009054814],"focalPoint":[-22.163253784231358,17.55373397057385,28.972948296001235],"viewUp":[-2.051034e-10,-0.97029572703367,0.2419218925608],"parallelScale":101.92947988832593,"directionOfProjection":[1.1842978621619476e-17,0.24192188708730178,0.9702957283983675]}},"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144":{"slice":{"slice":41,"min":0,"max":82,"axisDirection":"Superior","syncState":false},"window":{"auto":"FullRange","useAuto":false,"userTriggered":true,"width":81,"level":46},"camera":{"position":[-2.2272836908842484,2.4558144039077834,-583.7904043104862],"focalPoint":[-1.4482100259604564,-1.1179264052817643,-1.9742063331270465],"viewUp":[0.00114403,-1,-0.00614392],"parallelScale":106.17654155033951,"directionOfProjection":[0.0013390109674375123,-0.006142266583676531,0.9999802396101856]}}}},{"id":"ObliqueCoronal","type":"Oblique","props":{"viewDirection":"Posterior","viewUp":"Superior"},"config":{}},{"id":"ObliqueSagittal","type":"Oblique","props":{"viewDirection":"Right","viewUp":"Superior"},"config":{}},{"id":"ObliqueAxial","type":"Oblique","props":{"viewDirection":"Superior","viewUp":"Anterior"},"config":{}},{"id":"3D","type":"3D","props":{"viewDirection":"Posterior","viewUp":"Superior"},"config":{"1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922":{"camera":{"position":[-22.163253907287167,-564.594223248674,174.1187338921456],"focalPoint":[-22.163253784231358,17.55373397057385,28.972948296001235],"viewUp":[1.4080733262381892e-17,0.24192188680171967,0.9702957272529602],"parallelScale":155.28356376101038,"directionOfProjection":[2.0510340073149801e-10,0.9702957270336714,-0.2419218925608004]},"volumeColorConfig":{"colorBy":{"arrayName":"vtkDataArray838","location":"pointData"},"transferFunction":{"preset":"CT-Coronary-Arteries-2","mappingRange":[-2048,3661]},"opacityFunction":{"mode":1,"gaussians":[],"mappingRange":[0,1432],"preset":"CT-Coronary-Arteries-2","shift":0,"shiftAlpha":0},"cvr":{"enabled":true,"lightFollowsCamera":true,"volumeQuality":2,"useVolumetricScatteringBlending":false,"volumetricScatteringBlending":0.5,"useLocalAmbientOcclusion":true,"laoKernelRadius":5,"laoKernelSize":15,"ambient":0.2,"diffuse":0.7,"specular":0.3}}},"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144":{"camera":{"position":[-0.7825957138099202,-582.9333614467896,-5.548833820787268],"focalPoint":[-1.4482100259604564,-1.1179264052817643,-1.9742063331270465],"viewUp":[0.0013390391832217574,-0.00614239601418376,1.000001311302185],"parallelScale":150.58491532335074,"directionOfProjection":[-0.0011440076597175992,0.9999804722932084,0.0061438000233316895]},"volumeColorConfig":{"colorBy":{"arrayName":"vtkDataArray1797","location":"pointData"},"transferFunction":{"preset":"CT-Coronary-Arteries-2","mappingRange":[-2048,3661]},"opacityFunction":{"mode":1,"gaussians":[],"mappingRange":[0,496],"preset":"CT-Coronary-Arteries-2","shift":0,"shiftAlpha":0},"cvr":{"enabled":true,"lightFollowsCamera":true,"volumeQuality":2,"useVolumetricScatteringBlending":false,"volumetricScatteringBlending":0.5,"useLocalAmbientOcclusion":true,"laoKernelRadius":5,"laoKernelSize":15,"ambient":0.2,"diffuse":0.7,"specular":0.3}}}}},{"id":"Oblique3D","type":"Oblique3D","props":{"viewDirection":"Posterior","viewUp":"Superior","slices":[{"viewID":"ObliqueSagittal","axis":"Sagittal"},{"viewID":"ObliqueCoronal","axis":"Coronal"},{"viewID":"ObliqueAxial","axis":"Axial"}]},"config":{}}],"parentToLayers":[{"selectionKey":"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144","sourceSelectionKeys":["1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922"]}],"primarySelection":"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144"}
\ No newline at end of file
+{"version":"5.0.1","datasets":[{"id":"1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922","dataSourceId":1},{"id":"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144","dataSourceId":22}],"dataSources":[{"id":2,"type":"uri","name":"MRI-PROSTATEx-0004.zip","uri":"/tmp/prostate.zip"},{"id":3,"type":"archive","path":"MRI-PROSTATEx-0004/1-19.dcm","parent":2},{"id":4,"type":"archive","path":"MRI-PROSTATEx-0004/1-18.dcm","parent":2},{"id":5,"type":"archive","path":"MRI-PROSTATEx-0004/1-17.dcm","parent":2},{"id":6,"type":"archive","path":"MRI-PROSTATEx-0004/1-16.dcm","parent":2},{"id":7,"type":"archive","path":"MRI-PROSTATEx-0004/1-15.dcm","parent":2},{"id":8,"type":"archive","path":"MRI-PROSTATEx-0004/1-14.dcm","parent":2},{"id":9,"type":"archive","path":"MRI-PROSTATEx-0004/1-13.dcm","parent":2},{"id":10,"type":"archive","path":"MRI-PROSTATEx-0004/1-12.dcm","parent":2},{"id":11,"type":"archive","path":"MRI-PROSTATEx-0004/1-11.dcm","parent":2},{"id":12,"type":"archive","path":"MRI-PROSTATEx-0004/1-10.dcm","parent":2},{"id":13,"type":"archive","path":"MRI-PROSTATEx-0004/1-09.dcm","parent":2},{"id":14,"type":"archive","path":"MRI-PROSTATEx-0004/1-08.dcm","parent":2},{"id":15,"type":"archive","path":"MRI-PROSTATEx-0004/1-07.dcm","parent":2},{"id":16,"type":"archive","path":"MRI-PROSTATEx-0004/1-06.dcm","parent":2},{"id":17,"type":"archive","path":"MRI-PROSTATEx-0004/1-05.dcm","parent":2},{"id":18,"type":"archive","path":"MRI-PROSTATEx-0004/1-04.dcm","parent":2},{"id":19,"type":"archive","path":"MRI-PROSTATEx-0004/1-03.dcm","parent":2},{"id":20,"type":"archive","path":"MRI-PROSTATEx-0004/1-02.dcm","parent":2},{"id":21,"type":"archive","path":"MRI-PROSTATEx-0004/1-01.dcm","parent":2},{"id":1,"type":"collection","sources":[3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]},{"id":23,"type":"uri","name":"MRA-Head_and_Neck.zip","uri":"/tmp/MRA-Head_and_Neck.zip"},{"id":24,"type":"archive","path":"MRA-Head_and_Neck/4016","parent":23},{"id":25,"type":"archive","path":"MRA-Head_and_Neck/4046","parent":23},{"id":26,"type":"archive","path":"MRA-Head_and_Neck/3956","parent":23},{"id":27,"type":"archive","path":"MRA-Head_and_Neck/3986","parent":23},{"id":28,"type":"archive","path":"MRA-Head_and_Neck/3925","parent":23},{"id":29,"type":"archive","path":"MRA-Head_and_Neck/25492","parent":23},{"id":30,"type":"archive","path":"MRA-Head_and_Neck/25432","parent":23},{"id":31,"type":"archive","path":"MRA-Head_and_Neck/25402","parent":23},{"id":32,"type":"archive","path":"MRA-Head_and_Neck/25462","parent":23},{"id":33,"type":"archive","path":"MRA-Head_and_Neck/25372","parent":23},{"id":34,"type":"archive","path":"MRA-Head_and_Neck/25312","parent":23},{"id":35,"type":"archive","path":"MRA-Head_and_Neck/25342","parent":23},{"id":36,"type":"archive","path":"MRA-Head_and_Neck/25282","parent":23},{"id":37,"type":"archive","path":"MRA-Head_and_Neck/25252","parent":23},{"id":38,"type":"archive","path":"MRA-Head_and_Neck/25162","parent":23},{"id":39,"type":"archive","path":"MRA-Head_and_Neck/25222","parent":23},{"id":40,"type":"archive","path":"MRA-Head_and_Neck/25132","parent":23},{"id":41,"type":"archive","path":"MRA-Head_and_Neck/25102","parent":23},{"id":42,"type":"archive","path":"MRA-Head_and_Neck/25072","parent":23},{"id":43,"type":"archive","path":"MRA-Head_and_Neck/25042","parent":23},{"id":44,"type":"archive","path":"MRA-Head_and_Neck/24892","parent":23},{"id":45,"type":"archive","path":"MRA-Head_and_Neck/24952","parent":23},{"id":46,"type":"archive","path":"MRA-Head_and_Neck/25012","parent":23},{"id":47,"type":"archive","path":"MRA-Head_and_Neck/24922","parent":23},{"id":48,"type":"archive","path":"MRA-Head_and_Neck/24982","parent":23},{"id":49,"type":"archive","path":"MRA-Head_and_Neck/24742","parent":23},{"id":50,"type":"archive","path":"MRA-Head_and_Neck/24802","parent":23},{"id":51,"type":"archive","path":"MRA-Head_and_Neck/24832","parent":23},{"id":52,"type":"archive","path":"MRA-Head_and_Neck/24772","parent":23},{"id":53,"type":"archive","path":"MRA-Head_and_Neck/24201","parent":23},{"id":54,"type":"archive","path":"MRA-Head_and_Neck/23570","parent":23},{"id":55,"type":"archive","path":"MRA-Head_and_Neck/24531","parent":23},{"id":56,"type":"archive","path":"MRA-Head_and_Neck/23871","parent":23},{"id":57,"type":"archive","path":"MRA-Head_and_Neck/22549","parent":23},{"id":58,"type":"archive","path":"MRA-Head_and_Neck/23240","parent":23},{"id":59,"type":"archive","path":"MRA-Head_and_Neck/22910","parent":23},{"id":60,"type":"archive","path":"MRA-Head_and_Neck/22008","parent":23},{"id":61,"type":"archive","path":"MRA-Head_and_Neck/22338","parent":23},{"id":62,"type":"archive","path":"MRA-Head_and_Neck/21348","parent":23},{"id":63,"type":"archive","path":"MRA-Head_and_Neck/21678","parent":23},{"id":64,"type":"archive","path":"MRA-Head_and_Neck/21048","parent":23},{"id":65,"type":"archive","path":"MRA-Head_and_Neck/20718","parent":23},{"id":66,"type":"archive","path":"MRA-Head_and_Neck/20388","parent":23},{"id":67,"type":"archive","path":"MRA-Head_and_Neck/20117","parent":23},{"id":68,"type":"archive","path":"MRA-Head_and_Neck/19817","parent":23},{"id":69,"type":"archive","path":"MRA-Head_and_Neck/19127","parent":23},{"id":70,"type":"archive","path":"MRA-Head_and_Neck/17860","parent":23},{"id":71,"type":"archive","path":"MRA-Head_and_Neck/19457","parent":23},{"id":72,"type":"archive","path":"MRA-Head_and_Neck/18797","parent":23},{"id":73,"type":"archive","path":"MRA-Head_and_Neck/18196","parent":23},{"id":74,"type":"archive","path":"MRA-Head_and_Neck/18466","parent":23},{"id":75,"type":"archive","path":"MRA-Head_and_Neck/15910","parent":23},{"id":76,"type":"archive","path":"MRA-Head_and_Neck/16870","parent":23},{"id":77,"type":"archive","path":"MRA-Head_and_Neck/16180","parent":23},{"id":78,"type":"archive","path":"MRA-Head_and_Neck/17530","parent":23},{"id":79,"type":"archive","path":"MRA-Head_and_Neck/16540","parent":23},{"id":80,"type":"archive","path":"MRA-Head_and_Neck/17200","parent":23},{"id":81,"type":"archive","path":"MRA-Head_and_Neck/15640","parent":23},{"id":82,"type":"archive","path":"MRA-Head_and_Neck/15310","parent":23},{"id":83,"type":"archive","path":"MRA-Head_and_Neck/14980","parent":23},{"id":84,"type":"archive","path":"MRA-Head_and_Neck/14320","parent":23},{"id":85,"type":"archive","path":"MRA-Head_and_Neck/14080","parent":23},{"id":86,"type":"archive","path":"MRA-Head_and_Neck/14650","parent":23},{"id":87,"type":"archive","path":"MRA-Head_and_Neck/13419","parent":23},{"id":88,"type":"archive","path":"MRA-Head_and_Neck/13750","parent":23},{"id":89,"type":"archive","path":"MRA-Head_and_Neck/12759","parent":23},{"id":90,"type":"archive","path":"MRA-Head_and_Neck/13089","parent":23},{"id":91,"type":"archive","path":"MRA-Head_and_Neck/12128","parent":23},{"id":92,"type":"archive","path":"MRA-Head_and_Neck/12458","parent":23},{"id":93,"type":"archive","path":"MRA-Head_and_Neck/11827","parent":23},{"id":94,"type":"archive","path":"MRA-Head_and_Neck/11497","parent":23},{"id":95,"type":"archive","path":"MRA-Head_and_Neck/11167","parent":23},{"id":96,"type":"archive","path":"MRA-Head_and_Neck/10866","parent":23},{"id":97,"type":"archive","path":"MRA-Head_and_Neck/9215","parent":23},{"id":98,"type":"archive","path":"MRA-Head_and_Neck/9875","parent":23},{"id":99,"type":"archive","path":"MRA-Head_and_Neck/10536","parent":23},{"id":100,"type":"archive","path":"MRA-Head_and_Neck/10206","parent":23},{"id":101,"type":"archive","path":"MRA-Head_and_Neck/9545","parent":23},{"id":102,"type":"archive","path":"MRA-Head_and_Neck/8885","parent":23},{"id":103,"type":"archive","path":"MRA-Head_and_Neck/7895","parent":23},{"id":104,"type":"archive","path":"MRA-Head_and_Neck/8555","parent":23},{"id":105,"type":"archive","path":"MRA-Head_and_Neck/8225","parent":23},{"id":106,"type":"archive","path":"MRA-Head_and_Neck/7565","parent":23},{"id":22,"type":"collection","sources":[24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106]}],"datasetFilePath":{},"labelMaps":[],"tools":{"crosshairs":{"position":[0,0,0]},"paint":{"activeSegmentGroupID":null,"activeSegment":null,"brushSize":4,"crossPlaneSync":false},"crop":{"1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922":{"Sagittal":[-0.5,383.5],"Coronal":[-0.5,383.5],"Axial":[-0.5,18.5]},"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144":{"Sagittal":[-0.5,511.5],"Coronal":[-0.5,511.5],"Axial":[-0.5,82.5]}},"current":"WindowLevel","polygons":{"tools":[],"labels":{"1":{"labelName":"Label 1","color":"red","strokeWidth":1}}},"rectangles":{"tools":[],"labels":{"3":{"labelName":"Label 1","color":"red","strokeWidth":1,"fillColor":"transparent"}}},"rulers":{"tools":[],"labels":{"2":{"labelName":"Label 1","color":"red","strokeWidth":1}}}},"layout":{"name":"Axial Only","direction":"H","items":["Axial"]},"views":[{"id":"Coronal","type":"2D","props":{"viewDirection":"Posterior","viewUp":"Superior"},"config":{"1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922":{"slice":{"slice":192,"min":0,"max":383,"axisDirection":"Posterior","syncState":false},"window":{"auto":"FullRange","useAuto":false,"width":1120,"level":549},"camera":{"position":[-22.163253907287167,-564.594223248674,174.1187338921456],"focalPoint":[-22.163253784231358,17.55373397057385,28.972948296001235],"viewUp":[1.4080733262381892e-17,0.24192188680171967,0.9702957272529602],"parallelScale":101.92947988832593,"directionOfProjection":[2.0510340073149801e-10,0.9702957270336714,-0.2419218925608004]}},"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144":{"slice":{"slice":256,"min":0,"max":511,"axisDirection":"Posterior","syncState":false},"window":{"auto":"FullRange","useAuto":false,"userTriggered":true,"width":81,"level":46},"camera":{"position":[-0.7825957138099202,-582.9333614467896,-5.548833820787268],"focalPoint":[-1.4482100259604564,-1.1179264052817643,-1.9742063331270465],"viewUp":[0.0013390391832217574,-0.00614239601418376,1.000001311302185],"parallelScale":106.17654155033951,"directionOfProjection":[-0.0011440076597175992,0.9999804722932084,0.0061438000233316895]}}}},{"id":"Sagittal","type":"2D","props":{"viewDirection":"Right","viewUp":"Superior"},"config":{"1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922":{"slice":{"slice":192,"min":0,"max":383,"axisDirection":"Right","syncState":false},"window":{"auto":"FullRange","useAuto":false,"width":1120,"level":549},"camera":{"position":[577.8063647556294,17.5537338511733,28.972948325771128],"focalPoint":[-22.163253784231358,17.55373397057385,28.972948296001235],"viewUp":[1.4080733262381892e-17,0.24192188680171967,0.9702957272529602],"parallelScale":101.92947988832593,"directionOfProjection":[-1,1.99010999481902e-10,-4.961900119157013e-11]}},"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144":{"slice":{"slice":256,"min":0,"max":511,"axisDirection":"Right","syncState":false},"window":{"auto":"FullRange","useAuto":false,"userTriggered":true,"width":81,"level":46},"camera":{"position":[580.3672250155474,-0.44754120656388774,-2.7491612199849333],"focalPoint":[-1.4482100259604564,-1.1179264052817643,-1.9742063331270465],"viewUp":[0.0013390391832217574,-0.00614239601418376,1.000001311302185],"parallelScale":106.17654155033951,"directionOfProjection":[-0.9999984491279005,-0.001152228213038641,0.0013319579343003985]}}}},{"id":"Axial","type":"2D","props":{"viewDirection":"Superior","viewUp":"Anterior"},"config":{"1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922":{"slice":{"slice":9,"min":0,"max":18,"axisDirection":"Superior","syncState":false},"window":{"auto":"FullRange","useAuto":false,"width":1120,"level":549},"camera":{"position":[-22.163253784231365,-127.59204817029726,-553.175009054814],"focalPoint":[-22.163253784231358,17.55373397057385,28.972948296001235],"viewUp":[-2.051034e-10,-0.97029572703367,0.2419218925608],"parallelScale":101.92947988832593,"directionOfProjection":[1.1842978621619476e-17,0.24192188708730178,0.9702957283983675]}},"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144":{"slice":{"slice":41,"min":0,"max":82,"axisDirection":"Superior","syncState":false},"window":{"auto":"FullRange","useAuto":false,"userTriggered":true,"width":81,"level":46},"camera":{"position":[-2.2272836908842484,2.4558144039077834,-583.7904043104862],"focalPoint":[-1.4482100259604564,-1.1179264052817643,-1.9742063331270465],"viewUp":[0.00114403,-1,-0.00614392],"parallelScale":106.17654155033951,"directionOfProjection":[0.0013390109674375123,-0.006142266583676531,0.9999802396101856]}}}},{"id":"ObliqueCoronal","type":"Oblique","props":{"viewDirection":"Posterior","viewUp":"Superior"},"config":{}},{"id":"ObliqueSagittal","type":"Oblique","props":{"viewDirection":"Right","viewUp":"Superior"},"config":{}},{"id":"ObliqueAxial","type":"Oblique","props":{"viewDirection":"Superior","viewUp":"Anterior"},"config":{}},{"id":"3D","type":"3D","props":{"viewDirection":"Posterior","viewUp":"Superior"},"config":{"1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922":{"camera":{"position":[-22.163253907287167,-564.594223248674,174.1187338921456],"focalPoint":[-22.163253784231358,17.55373397057385,28.972948296001235],"viewUp":[1.4080733262381892e-17,0.24192188680171967,0.9702957272529602],"parallelScale":155.28356376101038,"directionOfProjection":[2.0510340073149801e-10,0.9702957270336714,-0.2419218925608004]},"volumeColorConfig":{"colorBy":{"arrayName":"vtkDataArray838","location":"pointData"},"transferFunction":{"preset":"CT-Coronary-Arteries-2","mappingRange":[-2048,3661]},"opacityFunction":{"mode":1,"gaussians":[],"mappingRange":[0,1432],"preset":"CT-Coronary-Arteries-2","shift":0,"shiftAlpha":0},"cvr":{"enabled":true,"lightFollowsCamera":true,"volumeQuality":2,"useVolumetricScatteringBlending":false,"volumetricScatteringBlending":0.5,"useLocalAmbientOcclusion":true,"laoKernelRadius":5,"laoKernelSize":15,"ambient":0.2,"diffuse":0.7,"specular":0.3}}},"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144":{"camera":{"position":[-0.7825957138099202,-582.9333614467896,-5.548833820787268],"focalPoint":[-1.4482100259604564,-1.1179264052817643,-1.9742063331270465],"viewUp":[0.0013390391832217574,-0.00614239601418376,1.000001311302185],"parallelScale":150.58491532335074,"directionOfProjection":[-0.0011440076597175992,0.9999804722932084,0.0061438000233316895]},"volumeColorConfig":{"colorBy":{"arrayName":"vtkDataArray1797","location":"pointData"},"transferFunction":{"preset":"CT-Coronary-Arteries-2","mappingRange":[-2048,3661]},"opacityFunction":{"mode":1,"gaussians":[],"mappingRange":[0,496],"preset":"CT-Coronary-Arteries-2","shift":0,"shiftAlpha":0},"cvr":{"enabled":true,"lightFollowsCamera":true,"volumeQuality":2,"useVolumetricScatteringBlending":false,"volumetricScatteringBlending":0.5,"useLocalAmbientOcclusion":true,"laoKernelRadius":5,"laoKernelSize":15,"ambient":0.2,"diffuse":0.7,"specular":0.3}}}}},{"id":"Oblique3D","type":"Oblique3D","props":{"viewDirection":"Posterior","viewUp":"Superior","slices":[{"viewID":"ObliqueSagittal","axis":"Sagittal"},{"viewID":"ObliqueCoronal","axis":"Coronal"},{"viewID":"ObliqueAxial","axis":"Axial"}]},"config":{}}],"parentToLayers":[{"selectionKey":"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144","sourceSelectionKeys":["1.3.6.1.4.1.14519.5.2.1.7311.5101.206828891270520544417996275680.5tse2d1254.538438420111018.1D000000SN0D000000S0D000000S0D000000S0D970296SN0D241922"]}],"primarySelection":"1.3.6.1.4.1.5962.1.1.0.0.0.1196533885.18148.0.21.31.200000e0051251220030505.1D000000S0D001152SN0D001332SN0D001144S1D000000S0D006144"}
\ No newline at end of file
diff --git a/tests/fixtures/pre-multi-4up.5-0-1.volview.json b/tests/fixtures/pre-multi-4up.5-0-1.volview.json
index d5fada989..d03f4af0f 100644
--- a/tests/fixtures/pre-multi-4up.5-0-1.volview.json
+++ b/tests/fixtures/pre-multi-4up.5-0-1.volview.json
@@ -11,7 +11,7 @@
             "id": 2,
             "type": "uri",
             "name": "MRI-PROSTATEx-0004.zip",
-            "uri": "https://data.kitware.com/api/v1/item/63527c7311dab8142820a338/download"
+            "uri": "/tmp/prostate.zip"
         },
         {
             "id": 3,
diff --git a/tests/rootHooks.ts b/tests/rootHooks.ts
new file mode 100644
index 000000000..cd69811b4
--- /dev/null
+++ b/tests/rootHooks.ts
@@ -0,0 +1,76 @@
+// Mocha root hooks, loaded through mochaOpts.require. They fail a test for
+// trouble a spec would otherwise sail past: a page that reaches the internet,
+// or a WebGL error.
+
+const LOCAL_HOSTS = ['localhost', '127.0.0.1', '[::1]'];
+const NETWORK_PROTOCOLS = ['http:', 'https:', 'ws:', 'wss:'];
+
+const WEBGL_FAILURES = [
+  'Error compiling shader',
+  'CONTEXT_LOST_WEBGL',
+  "reading 'setContext'",
+];
+
+let subscribedSession = '';
+const externalRequests: string[] = [];
+const webglErrors: string[] = [];
+
+// A spec that must reach an address compiled into the app swaps it in the
+// page with addInitScript. A network intercept or mock stalls the app's
+// data loading, even one that matches nothing.
+const isExternal = (rawUrl: string) => {
+  const url = new URL(rawUrl);
+  return (
+    NETWORK_PROTOCOLS.includes(url.protocol) &&
+    !LOCAL_HOSTS.includes(url.hostname)
+  );
+};
+
+function listen() {
+  browser.on('log.entryAdded', (entry) => {
+    const text = entry.text ?? '';
+    console.log(`[Browser Console] [${entry.level}] ${text}`);
+    if (WEBGL_FAILURES.some((failure) => text.includes(failure))) {
+      webglErrors.push(text);
+    }
+  });
+  browser.on('network.beforeRequestSent', (event) => {
+    if (isExternal(event.request.url)) {
+      externalRequests.push(event.request.url);
+    }
+  });
+}
+
+// reloadSession starts a session that has no subscriptions.
+async function subscribe() {
+  if (subscribedSession === browser.sessionId) return;
+  if (!subscribedSession) listen();
+  subscribedSession = browser.sessionId;
+  await browser.sessionSubscribe({
+    events: ['log.entryAdded', 'network.beforeRequestSent'],
+  });
+}
+
+export const mochaHooks = {
+  // Before a spec's own before hook, which may already load the page.
+  async beforeAll() {
+    await subscribe();
+  },
+
+  async beforeEach() {
+    await subscribe();
+  },
+
+  afterEach() {
+    const requested = externalRequests.splice(0);
+    const failed = webglErrors.splice(0);
+    if (requested.length) {
+      throw new Error(
+        `The page requested non-local URLs:\n${requested.join('\n')}`
+      );
+    }
+    if (failed.length) {
+      throw new Error(`WebGL failed during the test:\n${failed.join('\n')}`);
+    }
+  },
+};
diff --git a/tests/server/content-disposition-server.ts b/tests/server/content-disposition-server.ts
index 3f0c72087..6662deed4 100644
--- a/tests/server/content-disposition-server.ts
+++ b/tests/server/content-disposition-server.ts
@@ -4,6 +4,7 @@ import { readFileSync } from 'fs';
 import { join } from 'path';
 import { TEMP_DIR } from '../../wdio.shared.conf';
 import { AUX_PORT } from '../e2ePorts';
+import { CT_ELECTRODES } from '../datasets';
 
 export function createContentDispositionServer() {
   const app = express();
@@ -16,13 +17,13 @@ export function createContentDispositionServer() {
   );
 
   app.get('/scan', (req, res) => {
-    const filePath = join(TEMP_DIR, 'CT_Electrodes.nii.gz');
+    const filePath = join(TEMP_DIR, CT_ELECTRODES.name);
     const fileBuffer = readFileSync(filePath);
 
     res.setHeader('Content-Type', 'application/octet-stream');
     res.setHeader(
       'Content-Disposition',
-      'attachment; filename="CT_Electrodes.nii.gz"'
+      `attachment; filename="${CT_ELECTRODES.name}"`
     );
     res.send(fileBuffer);
   });
diff --git a/tests/specs/annotationTestUtils.ts b/tests/specs/annotationTestUtils.ts
index 457f7a100..66c3fc3d5 100644
--- a/tests/specs/annotationTestUtils.ts
+++ b/tests/specs/annotationTestUtils.ts
@@ -1,6 +1,6 @@
 import { type ChainablePromiseElement } from 'webdriverio';
 import AppPage from '../pageobjects/volview.page';
-import { MINIMAL_DICOM } from './configTestUtils';
+import { MINIMAL_DICOM } from '../datasets';
 import { openUrls } from './utils';
 
 const pointerAt = (x: number, y: number) =>
diff --git a/tests/specs/automatic-layering.e2e.ts b/tests/specs/automatic-layering.e2e.ts
index 8010fcfbf..27fb5200a 100644
--- a/tests/specs/automatic-layering.e2e.ts
+++ b/tests/specs/automatic-layering.e2e.ts
@@ -1,6 +1,6 @@
 import { DOWNLOAD_TIMEOUT } from '@/wdio.shared.conf';
 import { volViewPage } from '../pageobjects/volview.page';
-import { FETUS_DATASET } from './configTestUtils';
+import { FETUS_DATASET } from '../datasets';
 import { writeManifestToFile } from './utils';
 
 describe('Automatic Layering by File Name', () => {
@@ -15,7 +15,7 @@ describe('Automatic Layering by File Name', () => {
     await writeManifestToFile(config, configFileName);
 
     await volViewPage.open(
-      `?urls=[${FETUS_DATASET.url},${FETUS_DATASET.url},tmp/${configFileName}]&names=[base-image.mha,base-image.layer.mha,${configFileName}]`
+      `?urls=[tmp/${FETUS_DATASET.name},tmp/${FETUS_DATASET.name},tmp/${configFileName}]&names=[base-image.mha,base-image.layer.mha,${configFileName}]`
     );
     await volViewPage.waitForViews();
 
diff --git a/tests/specs/cine-drag-onto-slot.e2e.ts b/tests/specs/cine-drag-onto-slot.e2e.ts
index 66e57f192..dbf07e0ad 100644
--- a/tests/specs/cine-drag-onto-slot.e2e.ts
+++ b/tests/specs/cine-drag-onto-slot.e2e.ts
@@ -2,8 +2,8 @@
 // stores a 3D viewInfo. When cine binds to it, the slot renders as
 // CineViewer (data wins over slot type). Dragging a volume onto that same
 // slot reverts it to VolumeViewer because viewInfo was never mutated.
-import { CINE_US_DATASET, PROSTATEX_DATASET } from './configTestUtils';
-import { downloadFile, openUrls } from './utils';
+import { CINE_US_DATASET, PROSTATEX_DATASET } from '../datasets';
+import { openUrls } from './utils';
 import { volViewPage } from '../pageobjects/volview.page';
 
 const IMAGE_DRAG_MEDIA_TYPE = 'application/x-volview-image-id';
@@ -60,7 +60,6 @@ async function gridItemKind(index: number) {
 
 describe('Drag cine onto a non-2D slot', () => {
   it('cine renders in the 3D slot; dropping a volume reverts the slot to 3D', async () => {
-    await downloadFile(PROSTATEX_DATASET.url, PROSTATEX_DATASET.name);
     await openUrls([PROSTATEX_DATASET, CINE_US_DATASET]);
     await volViewPage.waitForViews();
     await browser.waitUntil(
diff --git a/tests/specs/cine-rendering.e2e.ts b/tests/specs/cine-rendering.e2e.ts
index a27364521..26791084b 100644
--- a/tests/specs/cine-rendering.e2e.ts
+++ b/tests/specs/cine-rendering.e2e.ts
@@ -1,10 +1,7 @@
 import { Key } from 'webdriverio';
 import { volViewPage } from '../pageobjects/volview.page';
-import {
-  CINE_US_DATASET,
-  COLOR3D_JPEG_BASELINE_DICOM,
-} from './configTestUtils';
-import { downloadFile, openUrls, writeManifestToFile } from './utils';
+import { CINE_US_DATASET, COLOR3D_JPEG_BASELINE_DICOM } from '../datasets';
+import { openUrls, writeManifestToFile } from './utils';
 
 const PLAY_CONTROLS = '.play-controls';
 const FRAME_LABEL = '.view-annotations .frame-label';
@@ -57,7 +54,6 @@ async function waitForCineFrameChange(index: number, previousText: string) {
 }
 
 async function openCineDatasetWithConfig(config: unknown, configName: string) {
-  await downloadFile(CINE_US_DATASET.url, CINE_US_DATASET.name);
   const configFileName = `${configName}-${Date.now()}.json`;
   await writeManifestToFile(config, configFileName);
   await volViewPage.open(
diff --git a/tests/specs/cine-ruler-mid-placement.e2e.ts b/tests/specs/cine-ruler-mid-placement.e2e.ts
index 2be86f8c7..4aa602714 100644
--- a/tests/specs/cine-ruler-mid-placement.e2e.ts
+++ b/tests/specs/cine-ruler-mid-placement.e2e.ts
@@ -7,7 +7,7 @@
 // click time is fragile (both render an svg <line>), so we scrub off the
 // click frame and back. A committed (buggy) ruler persists; an unfinished
 // placing tool is wiped by the reset on the second scroll.
-import { CINE_US_DATASET } from './configTestUtils';
+import { CINE_US_DATASET } from '../datasets';
 import { openUrls } from './utils';
 import { volViewPage } from '../pageobjects/volview.page';
 import {
diff --git a/tests/specs/cine-ruler-session.e2e.ts b/tests/specs/cine-ruler-session.e2e.ts
index 8bba5ac3b..046806117 100644
--- a/tests/specs/cine-ruler-session.e2e.ts
+++ b/tests/specs/cine-ruler-session.e2e.ts
@@ -3,7 +3,7 @@
 // frame N. A regression in either the zod schema or addTool defaults would
 // silently lose the per-frame association.
 import * as path from 'path';
-import { CINE_US_DATASET } from './configTestUtils';
+import { CINE_US_DATASET } from '../datasets';
 import { openUrls, SESSION_SAVE_TIMEOUT, waitForFileExists } from './utils';
 import { volViewPage } from '../pageobjects/volview.page';
 import { TEMP_DIR } from '../../wdio.shared.conf';
diff --git a/tests/specs/configTestUtils.ts b/tests/specs/configTestUtils.ts
index 74724384d..f290cad97 100644
--- a/tests/specs/configTestUtils.ts
+++ b/tests/specs/configTestUtils.ts
@@ -1,30 +1,11 @@
 import { volViewPage } from '../pageobjects/volview.page';
 import { writeManifestToFile } from './utils';
-
-export const ONE_CT_SLICE_DICOM = {
-  url: 'https://data.kitware.com/api/v1/file/6566aa81c5a2b36857ad1783/download',
-  name: 'CT000085.dcm',
-} as const;
-
-export const MINIMAL_DICOM = {
-  url: 'https://data.kitware.com/api/v1/file/68e9807dbf0f869935e36481/download',
-  name: 'minimal.dcm',
-} as const;
-
-export const MINIMAL_501_SESSION = {
-  url: 'https://data.kitware.com/api/v1/file/693077d880eaefe49a4abb88/download',
-  name: 'minimal-501-session.volview.zip',
-} as const;
-
-export const PROSTATEX_DATASET = {
-  url: 'https://data.kitware.com/api/v1/item/63527c7311dab8142820a338/download',
-  name: 'prostate.zip',
-} as const;
-
-export const PROSTATE_SEGMENT_GROUP = {
-  url: 'https://data.kitware.com/api/v1/file/692f13ed80eaefe49a4abb72/download',
-  name: 'prostate-total.seg.nii.gz',
-} as const;
+import {
+  ONE_CT_SLICE_DICOM,
+  PROSTATEX_DATASET,
+  PROSTATE_SEGMENT_GROUP,
+  type TestDataset,
+} from '../datasets';
 
 export const PROSTATE_610_LABELMAP_MANIFEST = {
   version: '6.1.0',
@@ -63,55 +44,14 @@ export const PROSTATE_610_LABELMAP_MANIFEST = {
   ],
 } as const;
 
-export const MRA_HEAD_NECK_DATASET = {
-  url: 'https://data.kitware.com/api/v1/item/6352a2b311dab8142820a33b/download',
-  name: 'MRA-Head_and_Neck.zip',
-} as const;
-
-export const FETUS_DATASET = {
-  url: 'https://data.kitware.com/api/v1/item/635679c311dab8142820a4f4/download',
-  name: 'fetus.zip',
-} as const;
-
-// Multiframe ultrasound DICOM from pydicom public test data.
-// SequenceOfUltrasoundRegions: PhysicalDeltaX/Y = 0.05104970559 cm/pixel
-// (unit code 3 = cm), so with US spacing fix the VTK spacing is ~0.5105 mm.
-export const US_MULTIFRAME_DICOM = {
-  url: 'https://data.kitware.com/api/v1/file/69e1630646ef98a20f563020/download',
-  name: 'US_multiframe_30frames.dcm',
-} as const;
-
-// 8-frame echocardiogram from the BSD-licensed GDCM test corpus. Native
-// Explicit VR LE, MONOCHROME2, retired Ultrasound Multi-frame SOP UID.
-export const CINE_US_DATASET = {
-  url: 'https://sourceforge.net/p/gdcm/gdcmdata/ci/master/tree/US-MONO2-8-8x-execho.dcm?format=raw',
-  name: 'US-MONO2-8-8x-echo.dcm',
-} as const;
-
-// 120-frame RGB ultrasound cine encoded as JPEG Baseline. Exercises the async
-// browser JPEG decode path used by common compressed ultrasound clips.
-export const COLOR3D_JPEG_BASELINE_DICOM = {
-  url: 'https://raw.githubusercontent.com/pydicom/pydicom-data/master/data_store/data/color3d_jpeg_baseline.dcm',
-  name: 'color3d_jpeg_baseline.dcm',
-} as const;
-
-export type DatasetResource = {
-  url: string;
-  name?: string;
-};
-
 export const openConfigAndDataset = async (
   config: unknown,
   name: string,
-  dataset: DatasetResource = ONE_CT_SLICE_DICOM
+  dataset: TestDataset = ONE_CT_SLICE_DICOM
 ) => {
   const configFileName = `${name}-config.json`;
   await writeManifestToFile(config, configFileName);
 
-  await volViewPage.open(
-    `?urls=[${dataset.url},tmp/${configFileName}]&names=[${
-      dataset.name ?? ''
-    },${configFileName}]`
-  );
+  await volViewPage.open(`?urls=[tmp/${dataset.name},tmp/${configFileName}]`);
   await volViewPage.waitForViews();
 };
diff --git a/tests/specs/content-disposition.e2e.ts b/tests/specs/content-disposition.e2e.ts
index f8b550d1c..659f3d4a6 100644
--- a/tests/specs/content-disposition.e2e.ts
+++ b/tests/specs/content-disposition.e2e.ts
@@ -1,18 +1,11 @@
 import { volViewPage } from '../pageobjects/volview.page';
-import { downloadFile } from './utils';
 import { startServer, stopServer } from '../server/content-disposition-server';
 import { AUX_PORT as SERVER_PORT } from '../e2ePorts';
 
-const CT_ELECTRODES = {
-  url: 'https://raw.githubusercontent.com/neurolabusc/niivue-images/main/CT_Electrodes.nii.gz',
-  name: 'CT_Electrodes.nii.gz',
-};
-
 describe('Content-Disposition header handling', () => {
   let server: ReturnType<typeof startServer>;
 
   before(async () => {
-    await downloadFile(CT_ELECTRODES.url, CT_ELECTRODES.name);
     server = startServer();
   });
 
diff --git a/tests/specs/crosshairs-multi-image.e2e.ts b/tests/specs/crosshairs-multi-image.e2e.ts
index 76cfa9230..b7371720f 100644
--- a/tests/specs/crosshairs-multi-image.e2e.ts
+++ b/tests/specs/crosshairs-multi-image.e2e.ts
@@ -1,4 +1,4 @@
-import { MRA_HEAD_NECK_DATASET, PROSTATEX_DATASET } from './configTestUtils';
+import { MRA_HEAD_NECK_DATASET, PROSTATEX_DATASET } from '../datasets';
 import { openUrls } from './utils';
 import { volViewPage } from '../pageobjects/volview.page';
 
diff --git a/tests/specs/different-direction-labelmap.e2e.ts b/tests/specs/different-direction-labelmap.e2e.ts
index 04c0f685a..ff29a2585 100644
--- a/tests/specs/different-direction-labelmap.e2e.ts
+++ b/tests/specs/different-direction-labelmap.e2e.ts
@@ -1,14 +1,7 @@
-import {
-  PROSTATEX_DATASET,
-  PROSTATE_SEGMENT_GROUP,
-  PROSTATE_610_LABELMAP_MANIFEST,
-} from './configTestUtils';
-import { downloadFile, writeManifestToFile } from './utils';
+import { PROSTATE_610_LABELMAP_MANIFEST } from './configTestUtils';
+import { writeManifestToFile } from './utils';
 import { volViewPage } from '../pageobjects/volview.page';
-import { DOWNLOAD_TIMEOUT, TEMP_DIR } from '../../wdio.shared.conf';
-import * as path from 'path';
-import * as fs from 'fs';
-import { cleanuptotal } from 'wdio-cleanuptotal-service';
+import { DOWNLOAD_TIMEOUT } from '../../wdio.shared.conf';
 
 /**
  * Regression test for labelmap with different direction matrix than parent image.
@@ -22,9 +15,6 @@ import { cleanuptotal } from 'wdio-cleanuptotal-service';
  */
 describe('Labelmap with different direction matrix', () => {
   it('paint tool works on coronal view', async () => {
-    await downloadFile(PROSTATEX_DATASET.url, PROSTATEX_DATASET.name);
-    await downloadFile(PROSTATE_SEGMENT_GROUP.url, PROSTATE_SEGMENT_GROUP.name);
-
     const config = {
       layouts: {
         'Coronal Only': [['coronal']],
@@ -35,11 +25,7 @@ describe('Labelmap with different direction matrix', () => {
     await writeManifestToFile(PROSTATE_610_LABELMAP_MANIFEST, manifestFileName);
 
     const configFileName = 'different-direction-labelmap-config.json';
-    const configFilePath = path.join(TEMP_DIR, configFileName);
-    await fs.promises.writeFile(configFilePath, JSON.stringify(config));
-    cleanuptotal.addCleanup(async () => {
-      fs.unlinkSync(configFilePath);
-    });
+    await writeManifestToFile(config, configFileName);
 
     const urlParams = `?urls=[tmp/${manifestFileName},tmp/${configFileName}]`;
     await volViewPage.open(urlParams);
diff --git a/tests/specs/layers-and-rendering.e2e.ts b/tests/specs/layers-and-rendering.e2e.ts
index a67be5fd0..50d53a4f8 100644
--- a/tests/specs/layers-and-rendering.e2e.ts
+++ b/tests/specs/layers-and-rendering.e2e.ts
@@ -4,7 +4,7 @@ import { cleanuptotal } from 'wdio-cleanuptotal-service';
 import { DOWNLOAD_TIMEOUT, FIXTURES, TEMP_DIR } from '@/wdio.shared.conf';
 import { volViewPage } from '../pageobjects/volview.page';
 import { openUrls, openVolViewPage, writeManifestToFile } from './utils';
-import { PROSTATEX_DATASET } from './configTestUtils';
+import { PROSTATEX_DATASET } from '../datasets';
 
 const openLayeringFixtures = async () => {
   const fixtureNames = ['prostate-3-slices.zip', 'mra-head-neck-3-slices.zip'];
diff --git a/tests/specs/layout-config.e2e.ts b/tests/specs/layout-config.e2e.ts
index a158183db..b89892a49 100644
--- a/tests/specs/layout-config.e2e.ts
+++ b/tests/specs/layout-config.e2e.ts
@@ -1,5 +1,6 @@
 import { volViewPage } from '../pageobjects/volview.page';
-import { PROSTATEX_DATASET, openConfigAndDataset } from './configTestUtils';
+import { openConfigAndDataset } from './configTestUtils';
+import { PROSTATEX_DATASET } from '../datasets';
 
 describe('VolView Layout Configuration', () => {
   it('should create a 2x2 grid layout from simple string array', async () => {
diff --git a/tests/specs/paint-fill-holes.e2e.ts b/tests/specs/paint-fill-holes.e2e.ts
index e90da9feb..4aed2c70a 100644
--- a/tests/specs/paint-fill-holes.e2e.ts
+++ b/tests/specs/paint-fill-holes.e2e.ts
@@ -1,10 +1,10 @@
 import AppPage from '../pageobjects/volview.page';
+import { PROSTATEX_DATASET } from '../datasets';
+import { openUrls } from './utils';
 
 describe('Fill Holes paint process', () => {
   beforeEach(async () => {
-    await AppPage.open();
-    await AppPage.downloadProstateSample();
-    await AppPage.waitForViews();
+    await openUrls([PROSTATEX_DATASET]);
 
     const views2D = await AppPage.getViews2D();
     const axialView = views2D[0];
diff --git a/tests/specs/paint-tool-rendering.e2e.ts b/tests/specs/paint-tool-rendering.e2e.ts
index 661af2fd8..e591409b2 100644
--- a/tests/specs/paint-tool-rendering.e2e.ts
+++ b/tests/specs/paint-tool-rendering.e2e.ts
@@ -1,10 +1,10 @@
 import AppPage from '../pageobjects/volview.page';
+import { PROSTATEX_DATASET } from '../datasets';
+import { openUrls } from './utils';
 
 describe('Paint tool rendering', () => {
   it('should not black out axial view after painting', async () => {
-    await AppPage.open();
-    await AppPage.downloadProstateSample();
-    await AppPage.waitForViews();
+    await openUrls([PROSTATEX_DATASET]);
 
     const views2D = await AppPage.getViews2D();
     const axialView = views2D[0];
diff --git a/tests/specs/reference-lines.e2e.ts b/tests/specs/reference-lines.e2e.ts
index 63eb3fd35..757962135 100644
--- a/tests/specs/reference-lines.e2e.ts
+++ b/tests/specs/reference-lines.e2e.ts
@@ -1,4 +1,4 @@
-import { PROSTATEX_DATASET } from './configTestUtils';
+import { PROSTATEX_DATASET } from '../datasets';
 import { openUrls } from './utils';
 import { volViewPage } from '../pageobjects/volview.page';
 
diff --git a/tests/specs/remote-manifest.e2e.ts b/tests/specs/remote-manifest.e2e.ts
index 64b509c82..ece688aec 100644
--- a/tests/specs/remote-manifest.e2e.ts
+++ b/tests/specs/remote-manifest.e2e.ts
@@ -1,6 +1,6 @@
 import { volViewPage } from '../pageobjects/volview.page';
-import { MINIMAL_DICOM } from './configTestUtils';
-import { downloadFile, writeManifestToFile, openVolViewPage } from './utils';
+import { MINIMAL_DICOM } from '../datasets';
+import { writeManifestToFile, openVolViewPage } from './utils';
 
 describe('VolView loading of remoteManifest.json', () => {
   it('should show error when there is no name and URL is malformed', async () => {
@@ -17,8 +17,6 @@ describe('VolView loading of remoteManifest.json', () => {
   });
 
   it('should load relative URI with no name property', async () => {
-    await downloadFile(MINIMAL_DICOM.url, MINIMAL_DICOM.name);
-
     const manifest = {
       resources: [{ url: `/tmp/${MINIMAL_DICOM.name}` }],
     };
diff --git a/tests/specs/reveal-slice.e2e.ts b/tests/specs/reveal-slice.e2e.ts
index 5134dbb91..ff123e77d 100644
--- a/tests/specs/reveal-slice.e2e.ts
+++ b/tests/specs/reveal-slice.e2e.ts
@@ -1,5 +1,5 @@
-import { CINE_US_DATASET, PROSTATEX_DATASET } from './configTestUtils';
-import { downloadFile, openUrls } from './utils';
+import { CINE_US_DATASET, PROSTATEX_DATASET } from '../datasets';
+import { openUrls } from './utils';
 import { volViewPage } from '../pageobjects/volview.page';
 import {
   advanceCineFrame,
@@ -88,7 +88,6 @@ const waitForSlice = async (expectedSlice1Indexed: number) => {
 
 describe('Reveal Slice on a volume image', () => {
   it('ruler Reveal Slice jumps the view back to the placed slice', async () => {
-    await downloadFile(PROSTATEX_DATASET.url, PROSTATEX_DATASET.name);
     await openUrls([PROSTATEX_DATASET]);
 
     await volViewPage.focusFirst2DView();
diff --git a/tests/specs/sample-rendering.e2e.ts b/tests/specs/sample-rendering.e2e.ts
index fc11c6d4d..41cf7ef39 100644
--- a/tests/specs/sample-rendering.e2e.ts
+++ b/tests/specs/sample-rendering.e2e.ts
@@ -1,10 +1,24 @@
 import AppPage from '../pageobjects/volview.page';
+import { PROSTATEX_DATASET } from '../datasets';
 
 const THRESHOLD = 12; // percent - handle pixel jitter in 3D view
 const RENDER_STABLE_TIMEOUT = 5000;
 
 describe('VolView', () => {
   it('should load and render a sample dataset', async () => {
+    // The sample's address is compiled into the app and is this dataset's
+    // origin, so hand it the cached copy. A network intercept is not an option: registering one stalls the
+    // app's workers.
+    await browser.addInitScript(
+      (remote, local) => {
+        const original = window.fetch;
+        window.fetch = (input, init) =>
+          original(input === remote ? local : input, init);
+      },
+      PROSTATEX_DATASET.origin,
+      `/tmp/${PROSTATEX_DATASET.name}`
+    );
+
     await AppPage.open();
     await AppPage.downloadProstateSample();
     await AppPage.waitForViews();
diff --git a/tests/specs/seg-nrrd-export.e2e.ts b/tests/specs/seg-nrrd-export.e2e.ts
index 684b7d4ab..582849d81 100644
--- a/tests/specs/seg-nrrd-export.e2e.ts
+++ b/tests/specs/seg-nrrd-export.e2e.ts
@@ -5,7 +5,8 @@ import JSZip from 'jszip';
 import { volViewPage } from '../pageobjects/volview.page';
 import { TEMP_DIR } from '../../wdio.shared.conf';
 import { waitForFileExists } from './utils';
-import { ONE_CT_SLICE_DICOM, openConfigAndDataset } from './configTestUtils';
+import { openConfigAndDataset } from './configTestUtils';
+import { ONE_CT_SLICE_DICOM } from '../datasets';
 
 /**
  * Parse NRRD header key-value pairs from a buffer (handles gzip).
diff --git a/tests/specs/segment-group-download.e2e.ts b/tests/specs/segment-group-download.e2e.ts
index 33f6b094e..52c97be0c 100644
--- a/tests/specs/segment-group-download.e2e.ts
+++ b/tests/specs/segment-group-download.e2e.ts
@@ -4,7 +4,7 @@ import { cleanuptotal } from 'wdio-cleanuptotal-service';
 import { openUrls, waitForFileExists } from './utils';
 import { volViewPage } from '../pageobjects/volview.page';
 import { TEMP_DIR } from '../../wdio.shared.conf';
-import { PROSTATEX_DATASET } from './configTestUtils';
+import { PROSTATEX_DATASET } from '../datasets';
 
 const SAVE_TIMEOUT = 40000;
 
diff --git a/tests/specs/segment-group-list-scroll.e2e.ts b/tests/specs/segment-group-list-scroll.e2e.ts
index f642e93b8..94d984b18 100644
--- a/tests/specs/segment-group-list-scroll.e2e.ts
+++ b/tests/specs/segment-group-list-scroll.e2e.ts
@@ -1,6 +1,6 @@
 import { volViewPage } from '../pageobjects/volview.page';
 import { openUrls } from './utils';
-import { PROSTATEX_DATASET } from './configTestUtils';
+import { PROSTATEX_DATASET } from '../datasets';
 
 // Six 48px rows overflow the list's 240px cap.
 const GROUP_COUNT = 6;
diff --git a/tests/specs/session-large-uri-base.e2e.ts b/tests/specs/session-large-uri-base.e2e.ts
index 42c5a84df..f76071f7b 100644
--- a/tests/specs/session-large-uri-base.e2e.ts
+++ b/tests/specs/session-large-uri-base.e2e.ts
@@ -5,6 +5,7 @@ import JSZip from 'jszip';
 import { cleanuptotal } from 'wdio-cleanuptotal-service';
 import { volViewPage } from '../pageobjects/volview.page';
 import { DOWNLOAD_TIMEOUT, TEMP_DIR } from '../../wdio.shared.conf';
+import { writeManifestToFile } from './utils';
 
 const writeBufferToFile = async (data: Buffer, fileName: string) => {
   const filePath = path.join(TEMP_DIR, fileName);
@@ -141,6 +142,15 @@ describe('Session with large URI base and nii.gz labelmap', function () {
     const sessionZip = await createSessionZip(baseFileName, labelmapNiftiGz);
     await writeBufferToFile(sessionZip, sessionFileName);
 
+    // A 1 GB float volume texture is more than software GL can allocate, and
+    // the heap is what this spec is about. Disabling the 3D view type is not
+    // enough: the view that replaces it allocates the same texture.
+    const configFileName = `${prefix}-config.json`;
+    await writeManifestToFile(
+      { layouts: { 'Axial Only': [['axial']] } },
+      configFileName
+    );
+
     const rangeErrors: string[] = [];
     const onLogEntry = (logEntry: { text: string | null }) => {
       const text = logEntry.text ?? '';
@@ -151,7 +161,9 @@ describe('Session with large URI base and nii.gz labelmap', function () {
     browser.on('log.entryAdded', onLogEntry);
 
     try {
-      await volViewPage.open(`?urls=[tmp/${sessionFileName}]`);
+      await volViewPage.open(
+        `?urls=[tmp/${sessionFileName},tmp/${configFileName}]`
+      );
       await volViewPage.waitForViews(DOWNLOAD_TIMEOUT * 6);
 
       // Open the segment groups panel so the list renders in the DOM
diff --git a/tests/specs/session-state-lifecycle.e2e.ts b/tests/specs/session-state-lifecycle.e2e.ts
index c41faea8b..2acc180e8 100644
--- a/tests/specs/session-state-lifecycle.e2e.ts
+++ b/tests/specs/session-state-lifecycle.e2e.ts
@@ -1,13 +1,8 @@
 import * as path from 'path';
 import * as fs from 'fs';
 import JSZip from 'jszip';
-import { MINIMAL_501_SESSION, PROSTATEX_DATASET } from './configTestUtils';
-import {
-  downloadFile,
-  openUrls,
-  SESSION_SAVE_TIMEOUT,
-  waitForFileExists,
-} from './utils';
+import { MINIMAL_501_SESSION, PROSTATEX_DATASET } from '../datasets';
+import { openUrls, SESSION_SAVE_TIMEOUT, waitForFileExists } from './utils';
 import { setValueVueInput, volViewPage } from '../pageobjects/volview.page';
 import { TEMP_DIR } from '../../wdio.shared.conf';
 
@@ -56,7 +51,6 @@ const saveAndParseManifest = async () => {
 };
 
 const loadSession = async () => {
-  await downloadFile(MINIMAL_501_SESSION.url, MINIMAL_501_SESSION.name);
   const urlParams = `?urls=[tmp/${MINIMAL_501_SESSION.name}]`;
   await volViewPage.open(urlParams);
   await volViewPage.waitForViews();
diff --git a/tests/specs/sparse-manifest-prostate-rectangle.e2e.ts b/tests/specs/sparse-manifest-prostate-rectangle.e2e.ts
index 5d712f6b1..31f400847 100644
--- a/tests/specs/sparse-manifest-prostate-rectangle.e2e.ts
+++ b/tests/specs/sparse-manifest-prostate-rectangle.e2e.ts
@@ -1,10 +1,8 @@
-import { PROSTATEX_DATASET } from './configTestUtils';
-import { downloadFile, openVolViewPage, writeManifestToZip } from './utils';
+import { PROSTATEX_DATASET } from '../datasets';
+import { openVolViewPage, writeManifestToZip } from './utils';
 
 describe('Sparse manifest with prostate rectangle', () => {
   it('loads prostate dataset with lesion rectangle annotation', async () => {
-    await downloadFile(PROSTATEX_DATASET.url, PROSTATEX_DATASET.name);
-
     const sparseManifest = {
       version: '6.1.0',
       dataSources: [
diff --git a/tests/specs/sparse-manifest.e2e.ts b/tests/specs/sparse-manifest.e2e.ts
index e160cae5e..fcbb27b37 100644
--- a/tests/specs/sparse-manifest.e2e.ts
+++ b/tests/specs/sparse-manifest.e2e.ts
@@ -1,11 +1,6 @@
+import { PROSTATE_610_LABELMAP_MANIFEST } from './configTestUtils';
+import { MINIMAL_DICOM } from '../datasets';
 import {
-  MINIMAL_DICOM,
-  PROSTATEX_DATASET,
-  PROSTATE_SEGMENT_GROUP,
-  PROSTATE_610_LABELMAP_MANIFEST,
-} from './configTestUtils';
-import {
-  downloadFile,
   openVolViewPage,
   writeManifestToFile,
   writeManifestToZip,
@@ -14,8 +9,6 @@ import { DOWNLOAD_TIMEOUT } from '../../wdio.shared.conf';
 
 describe('Sparse manifest.json', () => {
   it('loads manifest with only URL data source', async () => {
-    await downloadFile(MINIMAL_DICOM.url, MINIMAL_DICOM.name);
-
     const sparseManifest = {
       version: '6.1.0',
       dataSources: [
@@ -33,8 +26,6 @@ describe('Sparse manifest.json', () => {
   });
 
   it('loads sparse manifest with tools section (rectangle)', async () => {
-    await downloadFile(MINIMAL_DICOM.url, MINIMAL_DICOM.name);
-
     const sparseManifest = {
       version: '6.1.0',
       dataSources: [
@@ -98,8 +89,6 @@ describe('Sparse manifest.json', () => {
   });
 
   it('loads standalone JSON state file (not zipped)', async () => {
-    await downloadFile(MINIMAL_DICOM.url, MINIMAL_DICOM.name);
-
     const sparseManifest = {
       version: '6.1.0',
       dataSources: [
@@ -117,9 +106,6 @@ describe('Sparse manifest.json', () => {
   });
 
   it('loads remote segment group from URI', async () => {
-    await downloadFile(PROSTATEX_DATASET.url, PROSTATEX_DATASET.name);
-    await downloadFile(PROSTATE_SEGMENT_GROUP.url, PROSTATE_SEGMENT_GROUP.name);
-
     const fileName = 'remote-segment-group.volview.json';
     await writeManifestToFile(PROSTATE_610_LABELMAP_MANIFEST, fileName);
     await openVolViewPage(fileName);
diff --git a/tests/specs/ultrasound-spacing.e2e.ts b/tests/specs/ultrasound-spacing.e2e.ts
index 51d7a8677..a50b214c7 100644
--- a/tests/specs/ultrasound-spacing.e2e.ts
+++ b/tests/specs/ultrasound-spacing.e2e.ts
@@ -1,4 +1,4 @@
-import { US_MULTIFRAME_DICOM } from './configTestUtils';
+import { US_MULTIFRAME_DICOM } from '../datasets';
 import { openUrls } from './utils';
 import { volViewPage } from '../pageobjects/volview.page';
 
diff --git a/tests/specs/utils.ts b/tests/specs/utils.ts
index 756c1085a..184b74614 100644
--- a/tests/specs/utils.ts
+++ b/tests/specs/utils.ts
@@ -1,45 +1,10 @@
 import * as path from 'path';
 import * as fs from 'fs';
-import { z } from 'zod';
 import { cleanuptotal } from 'wdio-cleanuptotal-service';
 import JSZip from 'jszip';
-import {
-  DATASET_CACHE,
-  TEMP_DIR,
-  linkCachedDataset,
-} from '../../wdio.shared.conf';
+import { TEMP_DIR } from '../../wdio.shared.conf';
 import { volViewPage } from '../pageobjects/volview.page';
-import { RemoteResource } from '../../src/io/manifest';
-
-// Cached across runs, and not automatically deleted
-export const downloadFile = async (url: string, fileName: string) => {
-  const savePath = path.join(DATASET_CACHE, fileName);
-  if (!fs.existsSync(savePath)) {
-    // Download to a temporary file first to avoid race conditions
-    const tempPath = `${savePath}.${process.pid}.${Date.now()}.tmp`;
-    const response = await fetch(url);
-    const data = await response.arrayBuffer();
-    const buffer = Buffer.from(data);
-    fs.writeFileSync(tempPath, buffer);
-
-    // Atomic rename - if another process already created the file, this will fail safely
-    try {
-      fs.renameSync(tempPath, savePath);
-    } catch (err) {
-      // Another process beat us to it, clean up our temp file
-      try {
-        fs.unlinkSync(tempPath);
-      } catch {
-        // ignore
-      }
-      // Check if the final file exists and is complete
-      if (!fs.existsSync(savePath)) {
-        throw new Error(`Failed to download ${fileName}: ${err}`);
-      }
-    }
-  }
-  return linkCachedDataset(fileName);
-};
+import type { TestDataset } from '../datasets';
 
 export function writeMetaImage(
   fileName: string,
@@ -107,8 +72,6 @@ export async function openVolViewPage(fileName: string) {
   expect(notifications).toEqual(0);
 }
 
-type RemoteResourceType = z.infer<typeof RemoteResource> & { name: string };
-
 export const SESSION_SAVE_TIMEOUT = 40_000;
 
 export const waitForFileExists = (filePath: string, timeout: number) =>
@@ -140,14 +103,9 @@ export const waitForFileExists = (filePath: string, timeout: number) =>
     });
   });
 
-export async function openUrls(urlsAndNames: Array<RemoteResourceType>) {
-  await Promise.all(
-    urlsAndNames.map((resource) => downloadFile(resource.url, resource.name))
-  );
-
-  const resources = urlsAndNames.map(({ name }) => ({ url: `/tmp/${name}` }));
+export async function openUrls(datasets: ReadonlyArray<TestDataset>) {
   const manifest = {
-    resources,
+    resources: datasets.map(({ name }) => ({ url: `/tmp/${name}` })),
   };
   const fileName = `openUrlsManifest_${Date.now()}_${Math.random()
     .toString(36)
diff --git a/tests/specs/vtk-interactor-lifecycle.e2e.ts b/tests/specs/vtk-interactor-lifecycle.e2e.ts
index 24fd741cb..4980b08d3 100644
--- a/tests/specs/vtk-interactor-lifecycle.e2e.ts
+++ b/tests/specs/vtk-interactor-lifecycle.e2e.ts
@@ -1,4 +1,4 @@
-import { COLOR3D_JPEG_BASELINE_DICOM } from './configTestUtils';
+import { COLOR3D_JPEG_BASELINE_DICOM } from '../datasets';
 import { openUrls } from './utils';
 
 const VIEW_SELECTOR = 'div[data-testid="vtk-view vtk-cine-view"]';
@@ -12,7 +12,6 @@ async function captureBrowserConsoleLogsDuring(action: () => Promise<void>) {
     logs.push(entry);
   };
 
-  await (browser as any).sessionSubscribe({ events: ['log.entryAdded'] });
   browser.on('log.entryAdded', handler);
 
   try {
diff --git a/tests/specs/windowing-config.e2e.ts b/tests/specs/windowing-config.e2e.ts
index 382e36361..a7393e168 100644
--- a/tests/specs/windowing-config.e2e.ts
+++ b/tests/specs/windowing-config.e2e.ts
@@ -1,10 +1,7 @@
 import { volViewPage } from '../pageobjects/volview.page';
 import { openUrls } from './utils';
-import {
-  openConfigAndDataset,
-  ONE_CT_SLICE_DICOM,
-  MINIMAL_DICOM,
-} from './configTestUtils';
+import { openConfigAndDataset } from './configTestUtils';
+import { ONE_CT_SLICE_DICOM, MINIMAL_DICOM } from '../datasets';
 
 describe('VolView windowing configuration', () => {
   it('should use runtime config window level over DICOM window level', async () => {
diff --git a/tsconfig.json b/tsconfig.json
index 12fb2fac0..1b262cfbe 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
     "noEmit": true,
+    "allowImportingTsExtensions": true,
     "target": "es2019",
     "module": "esnext",
     "strict": true,
diff --git a/vite.config.ts b/vite.config.ts
index 517300225..76470fe91 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -103,10 +103,35 @@ function configureSentryPlugin() {
     : ({} as Plugin);
 }
 
+// @mdi/font also lists eot, woff and ttf sources. Every supported browser
+// takes woff2, but the build would copy all four.
+function woff2IconFont(): Plugin {
+  return {
+    name: 'woff2-icon-font',
+    enforce: 'pre',
+    transform(code, id) {
+      if (!id.includes('@mdi/font/css/')) return null;
+      const woff2 = code.match(/url\([^)]*\.woff2[^)]*\)\s*format\("woff2"\)/);
+      const fontFace = /@font-face\{[^}]*\}/;
+      if (!woff2 || !fontFace.test(code)) {
+        return this.error('@mdi/font no longer declares its woff2 font face');
+      }
+      return code.replace(
+        fontFace,
+        `@font-face{font-family:"Material Design Icons";src:${woff2[0]};font-weight:normal;font-style:normal}`
+      );
+    },
+  };
+}
+
 export default defineConfig({
   base: './',
   build: {
     outDir: distDir,
+    // An inlined font is downloaded with the render blocking stylesheet. As a
+    // file, a unicode-range subset is only fetched when the page needs it.
+    assetsInlineLimit: (filePath) =>
+      /\.(woff2?|ttf|eot)$/.test(filePath) ? false : undefined,
     rollupOptions: {
       output: {
         manualChunks(id) {
@@ -146,6 +171,7 @@ export default defineConfig({
     ],
   },
   plugins: [
+    woff2IconFont(),
     {
       name: 'virtual-modules',
       load(id) {
diff --git a/wdio.shared.conf.ts b/wdio.shared.conf.ts
index 1f6495cf4..d4aecac44 100644
--- a/wdio.shared.conf.ts
+++ b/wdio.shared.conf.ts
@@ -5,33 +5,8 @@ import type { Options, Capabilities } from '@wdio/types';
 import { SevereServiceError } from 'webdriverio';
 import { projectRoot } from './tests/e2eTestUtils';
 import { AUX_PORT, BASE_URL, TEST_PORT } from './tests/e2ePorts';
-
-const TEST_DATASETS = [
-  {
-    url: 'https://data.kitware.com/api/v1/file/6566aa81c5a2b36857ad1783/download',
-    name: 'CT000085.dcm',
-  },
-  {
-    url: 'https://data.kitware.com/api/v1/file/68e9807dbf0f869935e36481/download',
-    name: 'minimal.dcm',
-  },
-  {
-    url: 'https://data.kitware.com/api/v1/item/63527c7311dab8142820a338/download',
-    name: 'prostate.zip',
-  },
-  {
-    url: 'https://data.kitware.com/api/v1/item/6352a2b311dab8142820a33b/download',
-    name: 'MRA-Head_and_Neck.zip',
-  },
-  {
-    url: 'https://data.kitware.com/api/v1/item/635679c311dab8142820a4f4/download',
-    name: 'fetus.zip',
-  },
-  {
-    url: 'https://sourceforge.net/p/gdcm/gdcmdata/ci/master/tree/US-MONO2-8-8x-execho.dcm?format=raw',
-    name: 'US-MONO2-8-8x-echo.dcm',
-  },
-];
+import { TEST_DATASETS } from './tests/datasets';
+import { DATASET_CACHE, downloadDatasets } from './tests/downloadDatasets';
 
 // Fixed capture viewport (Playwright's default).
 export const CONTENT_VIEWPORT = { width: 1280, height: 720 } as const;
@@ -41,16 +16,13 @@ export const CONTENT_VIEWPORT = { width: 1280, height: 720 } as const;
 export const applyTestViewport = (browser: any) =>
   browser.setViewport({ ...CONTENT_VIEWPORT, devicePixelRatio: 1 });
 
-// for slow connections try:
-// DOWNLOAD_TIMEOUT=60000 && npm run test:e2e:dev
+// How long data may take to load and render. Nothing here crosses the network.
 export const DOWNLOAD_TIMEOUT = Number(process.env.DOWNLOAD_TIMEOUT ?? 30000);
 
 const IS_CI = !!(process.env.CI || process.env.GITHUB_ACTIONS);
 
 const ROOT = projectRoot();
 const TMP = '.tmp/';
-// Fixtures are downloaded once and shared by every run.
-export const DATASET_CACHE = path.resolve(ROOT, TMP, 'datasets');
 // Everything a run generates or downloads through the browser, including the
 // fixture links it serves. Also the browser downloads directory. Keyed by port
 // so a checkout, or an overridden port, gets scratch space of its own.
@@ -73,7 +45,7 @@ const removeDir = (dir: string) =>
  * Exposes a cached fixture under this run's directory, so specs can reach it at
  * `/tmp/<name>` without every run holding its own copy.
  */
-export function linkCachedDataset(name: string) {
+function linkCachedDataset(name: string) {
   const runPath = path.join(TEMP_DIR, name);
   if (fs.existsSync(runPath)) return runPath;
 
@@ -181,6 +153,7 @@ export const config: Options.Testrunner = {
   mochaOpts: {
     ui: 'bdd',
     timeout: 90_000,
+    require: ['./tests/rootHooks.ts'],
   },
 
   //
@@ -192,52 +165,15 @@ export const config: Options.Testrunner = {
     // directory of whichever suite is already holding the port.
     await assertPortsAvailable();
 
-    fs.mkdirSync(DATASET_CACHE, { recursive: true });
     // Start empty, so whatever is in here afterwards came from this run.
     removeDir(TEMP_DIR);
     fs.mkdirSync(TEMP_DIR, { recursive: true });
 
-    const RETRIES = 3;
-    const RETRY_DELAY_MS = 500;
-    const delay = (ms: number) =>
-      new Promise((resolve) => {
-        setTimeout(resolve, ms);
-      });
-    const downloadOnce = async (url: string, savePath: string) => {
-      const response = await fetch(url);
-      if (!response.ok) {
-        throw new Error(`HTTP ${response.status} for ${url}`);
-      }
-      const data = await response.arrayBuffer();
-      // Write to a temp path first so a failed/partial download never leaves a
-      // corrupt file that the existsSync check would treat as already cached.
-      const tmpPath = `${savePath}.part`;
-      fs.writeFileSync(tmpPath, Buffer.from(data));
-      fs.renameSync(tmpPath, savePath);
-    };
-
-    const downloads = TEST_DATASETS.map(async ({ url, name }) => {
-      const savePath = path.join(DATASET_CACHE, name);
-      if (!fs.existsSync(savePath)) {
-        for (let attempt = 1; attempt <= RETRIES; attempt += 1) {
-          try {
-            await downloadOnce(url, savePath);
-            break;
-          } catch (err) {
-            if (attempt === RETRIES) {
-              throw new Error(
-                `Failed to download ${name} after ${RETRIES} attempts: ${
-                  (err as Error).message
-                }`
-              );
-            }
-            await delay(RETRY_DELAY_MS);
-          }
-        }
-      }
-      linkCachedDataset(name);
+    // Severe, so a failed download aborts the run and is never a spec failure.
+    await downloadDatasets().catch((err: Error) => {
+      throw new SevereServiceError(err.message);
     });
-    await Promise.all(downloads);
+    TEST_DATASETS.forEach(({ name }) => linkCachedDataset(name));
   },
 
   async onComplete(exitCode, completedConfig) {
@@ -259,14 +195,6 @@ export const config: Options.Testrunner = {
     browser: any
   ) {
     await applyTestViewport(browser);
-
-    // Subscribe to browser console logs and output them directly
-    await browser.sessionSubscribe({ events: ['log.entryAdded'] });
-
-    browser.on('log.entryAdded', (logEntry: any) => {
-      const message = logEntry.text || '';
-      console.log(`[Browser Console] [${logEntry.level}] ${message}`);
-    });
   },
 
   async afterCommand(commandName: string) {