fix(rt): dont convert to volume for RTSTRUCT (#4157)

Co-authored-by: Alireza <ar.sedghi@gmail.com>

extensions/cornerstone/src/services/CornerstoneCacheService/CornerstoneCacheService.ts

@@ -143,14 +143,25 @@ class CornerstoneCacheService {
     return newViewportData;
   }
 
-  private _getStackViewportData(
+  private async _getStackViewportData(
     dataSource,
     displaySets,
     initialImageIndex,
     viewportType: Enums.ViewportType
-  ): StackViewportData {
-    // For Stack Viewport we don't have fusion currently
-    const displaySet = displaySets[0];
+  ): Promise<StackViewportData> {
+    const overlayDisplaySets = displaySets.filter(ds => ds.isOverlayDisplaySet);
+    const nonOverlayDisplaySets = displaySets.filter(ds => !ds.isOverlayDisplaySet);
+
+    // load overlays if they are not loaded
+    for (const overlayDisplaySet of overlayDisplaySets) {
+      if (overlayDisplaySet.load && overlayDisplaySet.load instanceof Function) {
+        const { userAuthenticationService } = this.servicesManager.services;
+        const headers = userAuthenticationService.getAuthorizationHeader();
+        await overlayDisplaySet.load({ headers });
+      }
+    }
+
+    const displaySet = nonOverlayDisplaySets[0];
 
     let stackImageIds = this.stackImageIds.get(displaySet.displaySetInstanceUID);
 
@@ -159,23 +170,23 @@ class CornerstoneCacheService {
       this.stackImageIds.set(displaySet.displaySetInstanceUID, stackImageIds);
     }
 
-    const { displaySetInstanceUID, StudyInstanceUID, isCompositeStack } = displaySet;
+    // Ensuring the first non-overlay `displaySet` is always the primary one
+    const StackViewportData = [displaySet, ...overlayDisplaySets].map(ds => {
+      const { displaySetInstanceUID, StudyInstanceUID, isCompositeStack } = ds;
 
-    const StackViewportData: StackViewportData = {
-      viewportType,
-      data: {
+      return {
         StudyInstanceUID,
         displaySetInstanceUID,
         isCompositeStack,
         imageIds: stackImageIds,
-      },
+        initialImageIndex,
+      };
+    });
+
+    return {
+      viewportType,
+      data: StackViewportData,
     };
-
-    if (typeof initialImageIndex === 'number') {
-      StackViewportData.data.initialImageIndex = initialImageIndex;
-    }
-
-    return StackViewportData;
   }
 
   private async _getVolumeViewportData(

extensions/cornerstone/src/services/ViewportService/CornerstoneViewportService.ts

@@ -557,9 +557,14 @@ class CornerstoneViewportService extends PubSubService implements IViewportServi
   ): Promise<void> {
     const displaySetOptions = viewportInfo.getDisplaySetOptions();
 
-    const { imageIds, initialImageIndex, displaySetInstanceUID } = viewportData.data;
+    const displaySetInstanceUIDs = viewportData.data.map(data => data.displaySetInstanceUID);
 
-    this.viewportsDisplaySets.set(viewport.id, [displaySetInstanceUID]);
+    // based on the cache service construct always the first one is the non-overlay
+    // and the rest are overlays
+
+    this.viewportsDisplaySets.set(viewport.id, [...displaySetInstanceUIDs]);
+
+    const { initialImageIndex, imageIds } = viewportData.data[0];
 
     let initialImageIndexToUse =
       presentations?.positionPresentation?.initialImageIndex ?? initialImageIndex;
@@ -588,6 +593,8 @@ class CornerstoneViewportService extends PubSubService implements IViewportServi
       }
     }
 
+    this._handleOverlays(viewport);
+
     return viewport.setStack(imageIds, initialImageIndexToUse).then(() => {
       viewport.setProperties({ ...properties });
       this.setPresentations(viewport.id, presentations);
@@ -772,24 +779,7 @@ class CornerstoneViewportService extends PubSubService implements IViewportServi
 
     this.setPresentations(viewport.id, presentations);
 
-    // load any secondary displaySets
-    const displaySetInstanceUIDs = this.viewportsDisplaySets.get(viewport.id);
-
-    // can be SEG or RTSTRUCT for now
-    const overlayDisplaySet = displaySetInstanceUIDs
-      .map(displaySetService.getDisplaySetByUID)
-      .find(displaySet => displaySet?.isOverlayDisplaySet);
-
-    if (overlayDisplaySet) {
-      this.addOverlayRepresentationForDisplaySet(overlayDisplaySet, viewport);
-    } else {
-      // If the displaySet is not a SEG displaySet we assume it is a primary displaySet
-      // and we can look into hydrated segmentations to check if any of them are
-      // associated with the primary displaySet
-
-      // get segmentations only returns the hydrated segmentations
-      this._addSegmentationRepresentationToToolGroupIfNecessary(displaySetInstanceUIDs, viewport);
-    }
+    this._handleOverlays(viewport);
 
     const toolGroup = toolGroupService.getToolGroupForViewport(viewport.id);
     csToolsUtils.segmentation.triggerSegmentationRender(toolGroup.id);
@@ -809,6 +799,28 @@ class CornerstoneViewportService extends PubSubService implements IViewportServi
     });
   }
 
+  private _handleOverlays(viewport: Types.IStackViewport | Types.IVolumeViewport) {
+    const { displaySetService } = this.servicesManager.services;
+
+    // load any secondary displaySets
+    const displaySetInstanceUIDs = this.viewportsDisplaySets.get(viewport.id);
+
+    // can be SEG or RTSTRUCT for now
+    const overlayDisplaySet = displaySetInstanceUIDs
+      .map(displaySetService.getDisplaySetByUID)
+      .find(displaySet => displaySet?.isOverlayDisplaySet);
+    if (overlayDisplaySet) {
+      this.addOverlayRepresentationForDisplaySet(overlayDisplaySet, viewport);
+    } else {
+      // If the displaySet is not a SEG displaySet we assume it is a primary displaySet
+      // and we can look into hydrated segmentations to check if any of them are
+      // associated with the primary displaySet
+
+      // get segmentations only returns the hydrated segmentations
+      this._addSegmentationRepresentationToToolGroupIfNecessary(displaySetInstanceUIDs, viewport);
+    }
+  }
+
   private _addSegmentationRepresentationToToolGroupIfNecessary(
     displaySetInstanceUIDs: string[],
     viewport: any