diff --git a/Assets/Editor/VolumeRenderedObjectCustomInspector.cs b/Assets/Editor/VolumeRenderedObjectCustomInspector.cs
index bd343c52..f83488c5 100644
--- a/Assets/Editor/VolumeRenderedObjectCustomInspector.cs
+++ b/Assets/Editor/VolumeRenderedObjectCustomInspector.cs
@@ -2,6 +2,7 @@
 using UnityEditor;
 using System.Collections.Generic;
 using System.Threading.Tasks;
+using System.IO;
 
 namespace UnityVolumeRendering
 {
@@ -11,6 +12,7 @@ public class VolumeRenderedObjectCustomInspector : Editor, IProgressView
         private bool tfSettings = true;
         private bool lightSettings = true;
         private bool otherSettings = true;
+        private bool secondaryVolumeSettings = true;
         private float currentProgress = 1.0f;
         private string currentProgressDescrition = "";
         private bool progressDirty = false;
@@ -137,6 +139,30 @@ public override void OnInspectorGUI()
                 }
             }
 
+            // Secondary volume
+            secondaryVolumeSettings = EditorGUILayout.Foldout(secondaryVolumeSettings, "Overlay volume");
+            VolumeRenderedObject secondaryObject = volrendObj.GetSecondaryVolume();
+            if (secondaryObject == null)
+            {
+                if (GUILayout.Button("Load PET data"))
+                {
+                    ImportPetScan(volrendObj);
+                }
+            }
+            else
+            {
+                if (GUILayout.Button("Edit secondary transfer function"))
+                {
+                    TransferFunctionEditorWindow.ShowWindow(secondaryObject);
+                }
+
+                if (GUILayout.Button("Remove secondary volume"))
+                {
+                    volrendObj.SetSecondaryVolume(null);
+                    GameObject.Destroy(secondaryObject.gameObject);
+                }
+            }
+
             // Other settings
             GUILayout.Space(10);
             otherSettings = EditorGUILayout.Foldout(otherSettings, "Other Settings");
@@ -152,5 +178,13 @@ public override void OnInspectorGUI()
                 volrendObj.SetSamplingRateMultiplier(EditorGUILayout.Slider("Sampling rate multiplier", volrendObj.GetSamplingRateMultiplier(), 0.2f, 2.0f));
             }
         }
+        private static async void ImportPetScan(VolumeRenderedObject targetObject)
+        {
+            VolumeRenderedObject petObject = await VolumeRendererEditorFunctions.DicomImportAsync(true);
+            petObject.transferFunction.colourControlPoints = new List<TFColourControlPoint>() { new TFColourControlPoint(0.0f, Color.red), new TFColourControlPoint(1.0f, Color.red) };
+            petObject.transferFunction.GenerateTexture();
+            targetObject.SetSecondaryVolume(petObject);
+            petObject.gameObject.SetActive(false);
+        }
     }
 }
diff --git a/Assets/Editor/VolumeRendererEditorFunctions.cs b/Assets/Editor/VolumeRendererEditorFunctions.cs
index f9001009..f845ab0b 100644
--- a/Assets/Editor/VolumeRendererEditorFunctions.cs
+++ b/Assets/Editor/VolumeRendererEditorFunctions.cs
@@ -33,7 +33,7 @@ private static void ShowDatasetImporter()
         [MenuItem("Volume Rendering/Load dataset/Load DICOM")]
         private static void ShowDICOMImporter()
         {
-            DicomImportAsync(true);
+            _ = DicomImportAsync(true);
         }
 
         [MenuItem("Volume Rendering/Load dataset/Load PET-CT DICOM")]
@@ -45,11 +45,12 @@ private static void ShowPETCTDICOMImporter()
         [MenuItem("Assets/Volume Rendering/Import dataset/Import DICOM")]
         private static void ImportDICOMAsset()
         {
-            DicomImportAsync(false);
+            _ = DicomImportAsync(false);
         }
 
-        private static async void DicomImportAsync(bool spawnInScene)
+        public static async Task<VolumeRenderedObject> DicomImportAsync(bool spawnInScene)
         {
+            VolumeRenderedObject obj = null;
             string dir = EditorUtility.OpenFolderPanel("Select a folder to load", "", "");
             if (Directory.Exists(dir))
             {
@@ -66,7 +67,7 @@ private static async void DicomImportAsync(bool spawnInScene)
                         if (spawnInScene)
                         {
                             VolumeDataset dataset = importTask.Result[i];
-                            VolumeRenderedObject obj = await VolumeObjectFactory.CreateObjectAsync(dataset);
+                            obj = await VolumeObjectFactory.CreateObjectAsync(dataset);
                             obj.transform.position = new Vector3(i, 0, 0);
                         }
                         else
@@ -83,6 +84,7 @@ private static async void DicomImportAsync(bool spawnInScene)
             {
                 Debug.LogError("Directory doesn't exist: " + dir);
             }
+            return obj;
         }
 
         private static async void PETCTDicomImportAsync()
diff --git a/Assets/Scripts/VolumeObject/VolumeRenderedObject.cs b/Assets/Scripts/VolumeObject/VolumeRenderedObject.cs
index d7c6b4ba..45351805 100644
--- a/Assets/Scripts/VolumeObject/VolumeRenderedObject.cs
+++ b/Assets/Scripts/VolumeObject/VolumeRenderedObject.cs
@@ -85,6 +85,11 @@ public SlicingPlane CreateSlicingPlane()
             return slicingPlaneComp;
         }
 
+        public VolumeRenderedObject GetSecondaryVolume()
+        {
+            return this.secondaryVolume;
+        }
+
         public void SetSecondaryVolume(VolumeRenderedObject volumeObject)
         {
             this.secondaryVolume = volumeObject;