fix(segmentation): segment bidirectional tool error and show toast notification when no segment is drawn (#5861)

extensions/cornerstone/src/commandsModule.ts

@@ -398,12 +398,31 @@ function commandsModule({
 
       const { segmentationId: targetId, segmentIndex: targetIndex } = targetSegmentation;
 
+      // Check if the segment has voxels before computing bidirectional measurement
+      const uniqueSegmentIndices = cstUtils.segmentation.getUniqueSegmentIndices(targetId);
+      const hasVoxels = uniqueSegmentIndices.includes(targetIndex);
+
+      if (!hasVoxels) {
+        uiNotificationService.show({
+          title: i18n.t('SegmentationPanel:Segment Bidirectional'),
+          message: i18n.t(
+            'SegmentationPanel:Draw a segment before using bidirectional measurement'
+          ),
+          type: 'warning',
+        });
+        return;
+      }
+
       // Get bidirectional measurement data
       const bidirectionalData = await cstUtils.segmentation.getSegmentLargestBidirectional({
         segmentationId: targetId,
         segmentIndices: [targetIndex],
       });
 
+      if (!bidirectionalData.length) {
+        return;
+      }
+
       const activeViewportId = viewportGridService.getActiveViewportId();
 
       // Process each bidirectional measurement