[wayfarer3130]

Context

The ECG viewport fails to show an ECG when the waveform data comes from a BulkDataURI.

• The ECG module builder in extensions/cornerstone/src/utils/ecgMetadata.ts fetched WaveformData.BulkDataURI itself, and it read the response as raw Int16 samples.
• DICOMweb returns bulkdata as multipart/related by default. The builder did not decode the multipart response, so the samples were shifted, or new Int16Array(buffer) threw on an odd byte count.
• When an instance had no usable waveform data, the builder returned no channels. The legacy ECG viewport then failed in canvasToWorld with Cannot read properties of undefined (reading 'baseline').

Changes & Results

User-visible changes

• The legacy ECG viewport and the ECG_NEXT viewport show ECGs whose WaveformData is a BulkDataURI.
• When the waveform does not load, the viewer shows an error notification ("The ECG waveform could not be loaded."), and the console logs the cause. Before this change, the builder returned no channels, and the viewport failed later with no message.
• A re-mount of the same ECG display set does not fetch the bulkdata again. A layout change or a second viewport with the same series is an example of a re-mount.
• The lead names still come from a lowercase codeMeaning in ChannelSourceSequence, as before this change.
• buildEcgModule passes the codeValue and the codingSchemeDesignator of each lead. buildEcgModuleFromInstance in Cornerstone drops these values.
• The orientation markers show nothing until the viewport gives a world position. The ECG viewport and the WSI viewport return undefined from canvasToWorld until the data loads, and vec3.sub then threw an error into the route error boundary.

Implementation changes

• buildEcgModule now calls buildEcgModuleFromInstance from @cornerstonejs/metadata. OHIF no longer keeps its own copy of the decoder.
• When the data source attached retrieveBulkData to WaveformData, the wrapper uses that method to get the bytes. The DICOMweb data source then does these steps:
  • The DICOMweb client decodes a multipart response or a single-part response.
  • The data source applies the auth headers.
  • The data source applies the fix for a relative bulkdata URI.
• The wrapper uses WaveformData.Value when the data source already cached the bytes there. The wrapper keeps the decoded channels, and it retries after a failed load.
• The wrapper gives a typed array to Cornerstone as an ArrayBuffer. The released builder unwraps a typed array to its first element, and then it fails.
• _setEcgViewport catches a failed mount from both viewport backends. Before this change, no caller handled the rejected promise.
• setViewportData and updateViewport log a rejected mount or re-mount. Before this change, a failed ECG re-mount with ECG_NEXT showed the notification, and the console also logged Uncaught (in promise).
• The DICOMweb data source sets the current auth headers on the shared client when retrieveBulkData runs. Before this change, the bulkdata request used the last headers that another operation set on the client. After a token refresh, those headers can be out of date.
• buildEcgModule gives a getHeaders option to buildEcgModuleFromInstance for a direct BulkDataURI fetch. The released @cornerstonejs/metadata ignores this option, and a pending Cornerstone ECG change adds it. Without that change, a direct fetch sends no auth header. The DICOMweb data source does not use the direct fetch, because it always attaches retrieveBulkData.

This change works with the released @cornerstonejs/metadata 5.10.3 and 5.11.7. It does not need a new Cornerstone release. It works with the legacy ECG viewport and with the ECG_NEXT viewport.

A related Cornerstone change in cornerstonejs/cornerstone3D#2899 fixes the multipart decoder of buildEcgModuleFromInstance for a direct BulkDataURI fetch. This OHIF change does not need that fix.

Testing

1. Load an ECG instance whose WaveformData is a BulkDataURI, from a DICOMweb server that returns multipart/related. The anonymous_ecg.dcm file of the viewer test data has 12 channels and 10000 samples, and it is an example.
2. Open the study in the viewer route. The 12 leads show, and the console shows no canvasToWorld error.
3. Change the layout, and then show the ECG again. The network panel shows no second bulkdata request.
4. Load an ECG instance whose WaveformData is InlineBinary. The leads show.
5. Do steps 2 to 4 with the legacy ECG viewport and with the ECG_NEXT viewport.
6. Open an ECG study and an SM study. The console shows no vec3 error from the orientation markers.
7. Run the unit tests: npx jest extensions/cornerstone/src/utils/ecgMetadata.test.ts.

This PR does not change the hanging protocols. The change to the @ohif/mnGrid rules is in #6362.

Checklist

PR

• My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• [] OS:
• [] Node version:
• [] Browser:

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Summary by CodeRabbit

Summary

• Bug Fixes
  • ECG viewport errors now display a notification, and viewport updates are sent only after display-set setup succeeds.
  • ECG waveform retrieval reuses cached data and can retry after a failed request.
  • DICOM bulk-data requests use the latest authorization headers.
  • Orientation markers remain stable when viewport coordinates are unavailable.
• Improvements
  • Hanging protocols better prioritize display sets with image frames, including ECG and whole-slide imaging.

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📒 Files selected for processing: 3

• extensions/cornerstone/src/Viewport/Overlays/ViewportOrientationMarkers.tsx
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• extensions/default/src/hangingprotocols/utils/seriesSelectors.ts

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📝 Walkthrough

The changes update ECG module construction and waveform retrieval, viewport failure handling, orientation marker guards, and hanging-protocol series matching.

Changes: ECG waveform and viewport handling

Layer / File(s)	Summary
ECG module construction and waveform retrieval extensions/cornerstone/src/utils/ecgMetadata.ts, extensions/cornerstone/src/utils/ecgMetadata.test.ts, extensions/default/src/DicomWebDataSource/index.ts	ECG module construction and waveform decoding use Cornerstone metadata utilities. Retrieval uses existing Value bytes or the data source, caches results, and clears the cache after failures. DICOMweb retrieval obtains current authorization headers when invoked. Tests cover inline and retrieved data, header forwarding, caching, and lead coding fields.
Viewport setup and ECG mount failure handling extensions/cornerstone/src/services/ViewportService/CornerstoneViewportService.ts	The service broadcasts VIEWPORT_DATA_CHANGED after successful setup and logs setup failures. It displays an ECG error notification when mounting fails, then rethrows the error.

Orientation marker guard

Layer / File(s)	Summary
Guard missing orientation points extensions/cornerstone/src/Viewport/Overlays/ViewportOrientationMarkers.tsx	The component returns an empty marker result when any of the three required canvas-to-world points is unavailable.

Hanging-protocol matching

Layer / File(s)	Summary
Update series matcher preferences extensions/default/src/hangingprotocols/utils/seriesSelectors.ts, extensions/default/src/hangingprotocols/utils/seriesSelectors.test.ts	The matcher changes its image-frame preference and adds preferences for ECG and SM modalities. Tests compare CT, ECG, and SM display-set scores with an SR display set without image frames.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant ECGModuleBuilder
  participant DicomWebDataSource
  participant SharedDicomWebClient
  participant CornerstoneMetadataUtilities
  ECGModuleBuilder->>DicomWebDataSource: Request waveform bulk data
  DicomWebDataSource->>SharedDicomWebClient: Retrieve data with current authorization headers
  SharedDicomWebClient-->>DicomWebDataSource: Return waveform bytes
  DicomWebDataSource-->>ECGModuleBuilder: Return waveform bytes
  ECGModuleBuilder->>CornerstoneMetadataUtilities: Decode waveform data
  CornerstoneMetadataUtilities-->>ECGModuleBuilder: Return decoded channels

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Viewers    Run #6924

Run Properties:   Passed #6924  •  89b2d41554: Merge branch 'master' into fix/ecg-waveform-bulkdata

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Branch Review	fix/ecg-waveform-bulkdata
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Commit	89b2d41554: Merge branch 'master' into fix/ecg-waveform-bulkdata
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Inline comments:
Review comments at
@extensions/cornerstone/src/services/ViewportService/CornerstoneViewportService.ts:
- Around line 915-923: Update the catch in _setEcgViewport so a rejected
backend.mountEcg does not resolve as a successful mount; retain the error
logging and notification, then propagate the failure or prevent setViewportData
from broadcasting VIEWPORT_DATA_CHANGED for this mount.

Review comments at @extensions/cornerstone/src/utils/ecgMetadata.ts:
- Around line 40-47: In decodeBulkData, check the result of
buildEcgModuleFromInstance(loaded) before accessing waveformData; if it is null,
throw an explicit error describing the waveform decode failure so the
mount-failure notification reports a clear cause.

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[jbocce]

Tested locally against Orthanc (DICOMweb plugin) with anonymous_ecg.dcm from OHIF/viewer-testdata (12 leads, 10000 samples).

Testing

• The WaveformData bulkdata request comes back as multipart/related, which is the case that broke before this change.
• All 12 leads render with the legacy ECG viewport and with ECG_NEXT (?useNextViewports=true). No canvasToWorld / baseline error in the console.
• A layout change and re-mount does not send a second bulkdata request.
• With the bulkdata request blocked in DevTools, the "The ECG waveform could not be loaded." notification shows.
• Baseline without this change (ECG code identical to master, ECG_NEXT viewport): the bulkdata request goes out with Accept: application/octet-stream, Orthanc returns 400 Bad Request, and the uncaught error takes the whole viewer route into the Error Boundary. With this branch, the same study loads via a multipart/related response and the leads render.

Comment

The PR description leaves out the trace-layout feature. Commit e05d356 adds a traceLayout viewport option, applyEcgTraceLayout, a new type in platform/core/src/types/HangingProtocol.ts, and lead codeValue passthrough. The description doesn't mention any of it. Could you add a section on it, including how to try it out? No hanging protocol in the repo sets traceLayout yet, so I couldn't test it.

The bulkdata fix itself looks good, and routing through the data source's retrieveBulkData is the right call.

[wayfarer3130]

@jbocce Thank you for the test against Orthanc.

I removed the trace layout from this PR in e7cd14c. The hanging protocol service passes all keys of viewportOptions to ViewportInfo. But CornerstoneViewportService gives only named options to Cornerstone: background, orientation and displayArea in defaultOptions, and some named properties at mount time. Thus each new viewport option needs its own code in the service. A later ECG PR will add the trace layout, and that PR will look at a generic pass-through of viewport options.

This PR keeps one part of that commit: buildEcgModule now passes codeValue and codingSchemeDesignator for each lead. buildEcgModuleFromInstance in Cornerstone drops these values, and that is a bug in Cornerstone. No released Cornerstone viewport reads the lead code yet, so only the unit test covers this change.

[jbocce]

Thanks for the updates. The trace-layout removal and the two error-handling fixes look good.

mnGrid change puts SEG into the segmentation mode layout

The segmentation mode uses @ohif/mnGrid by default (modes/segmentation/src/index.tsx), so the seriesWithImages change isn't limited to &hangingProtocolId=@ohif/mnGrid.

Repro: open 1.3.6.1.4.1.25403.345050719074.3824.20170125113417.1 in the segmentation route. On master (e.g. viewer-dev.ohif.org) only the image series is hung. On this branch, a SEG series is added to the layout by default.

Cause: removing required: true. Real SEG and SR display sets have no numImageFrames (undefined, not 0), so the old required rule (undefined >= 0 fails) excluded them entirely. The commit message says SR and SEG used to tie with images, but that only holds when they have numImageFrames: 0, as in the new unit test. What actually tied with images before was PDF, ECG and SM (all numImageFrames: 0). Without the required rule, SEG and SR become score-0 candidates and fill spare viewports.

Suggested fix: keep the original required rule, and add the new weighted rules next to it.

• The required rule (numImageFrames greaterThan 0, which tests >= 0) leaves out any display set with no frame count. That keeps SEG and SR out of the grid, as on master.
• The new rules then rank what's left: images (at least 1 frame), ECG and SM get 2 points, while PDF (0 frames, not ECG or SM) gets 1.

So images, ECG and SM still fill the grid first, and SEG/SR no longer appear.

The SR case in the new seriesSelectors.test.ts uses numImageFrames: 0, but real SEG and SR display sets don't set numImageFrames at all. That's why the test passes while the segmentation mode shows the SEG. Could the test use a display set without numImageFrames, so it covers this case?

Minor: updateViewport doesn't handle the re-thrown error

setViewportData now has a rejection handler, but updateViewport (displaySetPromise.then(...), ~line 1544) doesn't. With ECG_NEXT, NextViewportBackend.remount goes through _setEcgViewport, so a failed waveform load on re-mount shows the toast but also logs an Uncaught (in promise). Non-blocking.

[wayfarer3130]

@jbocce Thank you for the review, and for the repro in the segmentation mode.

• mnGrid: I moved the mnGrid change out of this PR into fix(hanging-protocols): keep display sets without images out of the mnGrid layout, and show ECG and SM studies in 1x1 #6362. This PR now keeps the mnGrid rules of master (a96c66d). On master, an ECG display set already passes the mnGrid rule, because the ECG SOP class handler sets numImageFrames to 0. Thus this PR does not need the mnGrid change.
• updateViewport: 12980b1 adds a rejection handler to updateViewport, the same as the handler in setViewportData. With ECG_NEXT, a failed re-mount now shows the notification and logs the error. The console no longer shows Uncaught (in promise).

The unit tests of ecgMetadata.test.ts pass. I did not test the re-mount failure again in a browser.

[jbocce]

I redid the tests from #6346 (review). The code changes look fine. I will check the other PR for the mnGrid changes soon. Approved but please wait for the Playwright tests to pass. There is one test I think that keeps failing that we should address soon.