diff --git a/extensions/cornerstone/src/services/CornerstoneCacheService/CornerstoneCacheService.ts b/extensions/cornerstone/src/services/CornerstoneCacheService/CornerstoneCacheService.ts
index b02cc43f1..0b22d1259 100644
--- a/extensions/cornerstone/src/services/CornerstoneCacheService/CornerstoneCacheService.ts
+++ b/extensions/cornerstone/src/services/CornerstoneCacheService/CornerstoneCacheService.ts
@@ -84,12 +84,26 @@ class CornerstoneCacheService {
     invalidatedDisplaySetInstanceUID: string,
     dataSource,
     displaySetService
-  ) {
+  ): Promise<VolumeViewportData | StackViewportData> {
     if (viewportData.viewportType === Enums.ViewportType.STACK) {
-      return this._getCornerstoneStackImageIds(
-        displaySetService.getDisplaySetByUID(invalidatedDisplaySetInstanceUID),
-        dataSource
-      );
+      const displaySet = displaySetService.getDisplaySetByUID(invalidatedDisplaySetInstanceUID);
+      const imageIds = this._getCornerstoneStackImageIds(displaySet, dataSource);
+
+      // remove images from the cache to be able to re-load them
+      imageIds.forEach(imageId => {
+        if (cs3DCache.getImageLoadObject(imageId)) {
+          cs3DCache.removeImageLoadObject(imageId);
+        }
+      });
+
+      return {
+        viewportType: Enums.ViewportType.STACK,
+        data: {
+          StudyInstanceUID: displaySet.StudyInstanceUID,
+          displaySetInstanceUID: invalidatedDisplaySetInstanceUID,
+          imageIds,
+        },
+      };
     }
 
     // Todo: grab the volume and get the id from the viewport itself
diff --git a/extensions/default/src/getPTImageIdInstanceMetadata.ts b/extensions/default/src/getPTImageIdInstanceMetadata.ts
index bacad3dbf..4a9e114e0 100644
--- a/extensions/default/src/getPTImageIdInstanceMetadata.ts
+++ b/extensions/default/src/getPTImageIdInstanceMetadata.ts
@@ -17,14 +17,14 @@ export default function getPTImageIdInstanceMetadata(imageId: string): InstanceM
     dicomMetaData.CorrectedImage === undefined ||
     dicomMetaData.Units === undefined ||
     !dicomMetaData.RadiopharmaceuticalInformationSequence ||
-    dicomMetaData.RadiopharmaceuticalInformationSequence[0].RadionuclideHalfLife === undefined ||
-    dicomMetaData.RadiopharmaceuticalInformationSequence[0].RadionuclideTotalDose === undefined ||
+    dicomMetaData.RadiopharmaceuticalInformationSequence.RadionuclideHalfLife === undefined ||
+    dicomMetaData.RadiopharmaceuticalInformationSequence.RadionuclideTotalDose === undefined ||
     dicomMetaData.DecayCorrection === undefined ||
     dicomMetaData.AcquisitionDate === undefined ||
     dicomMetaData.AcquisitionTime === undefined ||
-    (dicomMetaData.RadiopharmaceuticalInformationSequence[0].RadiopharmaceuticalStartDateTime ===
+    (dicomMetaData.RadiopharmaceuticalInformationSequence.RadiopharmaceuticalStartDateTime ===
       undefined &&
-      dicomMetaData.RadiopharmaceuticalInformationSequence[0].RadiopharmaceuticalStartTime ===
+      dicomMetaData.RadiopharmaceuticalInformationSequence.RadiopharmaceuticalStartTime ===
         undefined)
   ) {
     throw new Error('required metadata are missing');
@@ -37,14 +37,13 @@ export default function getPTImageIdInstanceMetadata(imageId: string): InstanceM
   const instanceMetadata: InstanceMetadata = {
     CorrectedImage: dicomMetaData.CorrectedImage,
     Units: dicomMetaData.Units,
-    RadionuclideHalfLife:
-      dicomMetaData.RadiopharmaceuticalInformationSequence[0].RadionuclideHalfLife,
+    RadionuclideHalfLife: dicomMetaData.RadiopharmaceuticalInformationSequence.RadionuclideHalfLife,
     RadionuclideTotalDose:
-      dicomMetaData.RadiopharmaceuticalInformationSequence[0].RadionuclideTotalDose,
+      dicomMetaData.RadiopharmaceuticalInformationSequence.RadionuclideTotalDose,
     RadiopharmaceuticalStartDateTime:
-      dicomMetaData.RadiopharmaceuticalInformationSequence[0].RadiopharmaceuticalStartDateTime,
+      dicomMetaData.RadiopharmaceuticalInformationSequence.RadiopharmaceuticalStartDateTime,
     RadiopharmaceuticalStartTime:
-      dicomMetaData.RadiopharmaceuticalInformationSequence[0].RadiopharmaceuticalStartTime,
+      dicomMetaData.RadiopharmaceuticalInformationSequence.RadiopharmaceuticalStartTime,
     DecayCorrection: dicomMetaData.DecayCorrection,
     PatientWeight: dicomMetaData.PatientWeight,
     SeriesDate: dicomMetaData.SeriesDate,