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 30eaf347..1f77aabc 100644
--- a/src/views/trials/trials-panel/reading/dicoms3D/components/PetCtViewport.vue
+++ b/src/views/trials/trials-panel/reading/dicoms3D/components/PetCtViewport.vue
@@ -264,7 +264,7 @@ export default {
     handleElementContextMenu(e) {
       e.preventDefault()
       e.stopPropagation()
-
+      if (this.series.Modality !== 'NM') return false
       const annotation = this.getCircleAnnotationFromContextMenuEvent(e)
       if (!annotation) {
         this.hideAnnotationContextMenu()