diff --git a/src/views/trials/trials-panel/reading/dicoms/components/Fusion/PetCt.vue b/src/views/trials/trials-panel/reading/dicoms/components/Fusion/PetCt.vue
index 2dccbda6..9d037c0d 100644
--- a/src/views/trials/trials-panel/reading/dicoms/components/Fusion/PetCt.vue
+++ b/src/views/trials/trials-panel/reading/dicoms/components/Fusion/PetCt.vue
@@ -1664,7 +1664,11 @@ export default {
       })
     },
     upperRangeChange(v) {
-      if (v === 0 || v < this.upper) {
+      if (this.lastUpper === v) return;
+      this.lastUpper = v;
+      this.upper = v;
+
+      if (v === 0) {
         return
       }
       var sliderBox = document.getElementById('sliderBox')
@@ -1682,6 +1686,8 @@ export default {
       slider.style.left = left + 'px'
       var positionValue = document.getElementById('slider-position')
       positionValue.textContent = this.upper
+
+      this.voiChange(v)
     },
     renderColorMaps() {
       this.createColorBar(this.rgbPresetName, 'colorBarCanvas', 256, 15)
@@ -1713,6 +1719,7 @@ export default {
         : { lower: voiRange[0], upper: voiRange[1] }
     },
     voiChange(v) {
+      this.lastUpper = v;
       let viewportIds = ['FUSION_AXIAL', 'PT_AXIAL', 'PET_MIP_CORONAL']
       viewportIds.map(viewportId => {
         // const volumeId = viewportId === 'viewportId' ? ptVolumeId : ctVolumeId
diff --git a/src/views/trials/trials-panel/reading/dicoms/components/Fusion/Viewport.vue b/src/views/trials/trials-panel/reading/dicoms/components/Fusion/Viewport.vue
index c94b19f5..4ebcdbbf 100644
--- a/src/views/trials/trials-panel/reading/dicoms/components/Fusion/Viewport.vue
+++ b/src/views/trials/trials-panel/reading/dicoms/components/Fusion/Viewport.vue
@@ -582,7 +582,9 @@ export default {
           upper
         )
         this.imageInfo.wwwc = `${Math.round(windowWidth)}/${Math.round(windowCenter)}`
-        this.$emit('upperRangeChange', Math.round(windowWidth))
+        if (this.index !== 1) {
+          this.$emit('upperRangeChange', Math.round(upper))
+        }
       }
     },
     async getScreenshots() {
diff --git a/src/views/trials/trials-panel/reading/dicoms3D/components/PetCtViewport.vue b/src/views/trials/trials-panel/reading/dicoms3D/components/PetCtViewport.vue
index 95059328..29130d63 100644
--- a/src/views/trials/trials-panel/reading/dicoms3D/components/PetCtViewport.vue
+++ b/src/views/trials/trials-panel/reading/dicoms3D/components/PetCtViewport.vue
@@ -291,7 +291,9 @@ Colorbar: null,
           upper
         )
         this.imageInfo.wwwc = `${Math.round(windowWidth)}/${Math.round(windowCenter)}`
-        this.$emit('upperRangeChange', Math.round(windowWidth))
+        if (this.series.Modality === 'PT' || this.series.Modality === 'NM' || this.isFusion) {
+          this.$emit('upperRangeChange', Math.round(upper))
+        }
       }
     },
     getOrientationMarker() {
@@ -534,7 +536,7 @@ Colorbar: null,
               }
             },
             {
-              volumeId: data.SeriesInstanceUid, callback: (r) => {
+              volumeId: this.ptVolumeId, callback: (r) => {
                 setPetColorMapTransferFunctionForVolumeActor(r)
                 if (this.series.Modality === 'NM') {
                   this.nmFusionVolumeActor = r.volumeActor
diff --git a/src/views/trials/trials-panel/reading/dicoms3D/components/ReadPage.vue b/src/views/trials/trials-panel/reading/dicoms3D/components/ReadPage.vue
index 0b0ff8b4..fb9f39b6 100644
--- a/src/views/trials/trials-panel/reading/dicoms3D/components/ReadPage.vue
+++ b/src/views/trials/trials-panel/reading/dicoms3D/components/ReadPage.vue
@@ -756,7 +756,8 @@ export default {
             segmentationId: null
           },
         },
-      }
+      },
+      fusionOverlayModality: null
     }
   },
   computed: {
@@ -3729,8 +3730,13 @@ export default {
       return pairs.map((p) => p.imageId);
     },
     upperRangeChange(upper) {
-      this.$refs.colorMap.upper = upper
-      this.$refs.colorMap.upperRangeChange(upper)
+      if (this.lastUpper === upper) return;
+      this.lastUpper = upper;
+      if (this.$refs.colorMap) {
+        this.$refs.colorMap.upper = upper
+        this.$refs.colorMap.upperRangeChange(upper)
+      }
+      this.voiChange(upper)
     },
     openFusion() {
       this.fusionVisible = true