diff --git a/common/reviews/api/tools.api.md b/common/reviews/api/tools.api.md
index 9cdda89a26..9b3d67d33f 100644
--- a/common/reviews/api/tools.api.md
+++ b/common/reviews/api/tools.api.md
@@ -9,7 +9,6 @@ import { Corners } from '@kitware/vtk.js/Interaction/Widgets/OrientationMarkerWi
 import type { IColorMapPreset } from '@kitware/vtk.js/Rendering/Core/ColorTransferFunction/ColorMaps';
 import type { mat3 } from 'gl-matrix';
 import { mat4 } from 'gl-matrix';
-import { PixelDataTypedArray as PixelDataTypedArray_2 } from 'packages/core/dist/esm/types';
 import type { Range as Range_2 } from '@kitware/vtk.js/types';
 import { vec3 } from 'gl-matrix';
 import type vtkActor from '@kitware/vtk.js/Rendering/Core/Actor';
@@ -2464,23 +2463,14 @@ declare namespace EventTypes_2 {
 function extend2DBoundingBoxInViewAxis(boundsIJK: [Types_2.Point2, Types_2.Point2, Types_2.Point2], numSlicesToProject: number): [Types_2.Point2, Types_2.Point2, Types_2.Point2];
 
 // @public (undocumented)
-function extractWindowLevelRegionToolData(viewport: any): {
-    scalarData: PixelDataTypedArray_2;
+function extractWindowLevelRegionToolData(viewport: Types_2.IVolumeViewport | Types_2.IStackViewport): {
+    scalarData: Types_2.PixelDataTypedArray;
     minPixelValue: number;
     maxPixelValue: number;
     width: number;
     height: number;
     rows: number;
     columns: number;
-} | {
-    scalarData: any;
-    width: any;
-    height: any;
-    minPixelValue: number;
-    maxPixelValue: number;
-    rows: any;
-    columns: any;
-    color: any;
 };
 
 // @public (undocumented)
diff --git a/packages/tools/src/stateManagement/segmentation/helpers/getSegmentationActor.ts b/packages/tools/src/stateManagement/segmentation/helpers/getSegmentationActor.ts
index 58e463c037..0c088d69fe 100644
--- a/packages/tools/src/stateManagement/segmentation/helpers/getSegmentationActor.ts
+++ b/packages/tools/src/stateManagement/segmentation/helpers/getSegmentationActor.ts
@@ -1,3 +1,4 @@
+import type { Types } from '@cornerstonejs/core';
 import { getEnabledElementByViewportId } from '@cornerstonejs/core';
 import { SegmentationRepresentations } from '../../../enums';
 
@@ -11,8 +12,8 @@ import { SegmentationRepresentations } from '../../../enums';
 function getActorEntry(
   viewportId: string,
   segmentationId: string,
-  filterFn: (actor: unknown) => boolean
-) {
+  filterFn: (actor: Types.ActorEntry) => boolean
+): Types.ActorEntry | undefined {
   const enabledElement = getEnabledElementByViewportId(viewportId);
 
   if (!enabledElement) {
diff --git a/packages/tools/src/utilities/voi/windowlevel/extractWindowLevelRegionToolData.ts b/packages/tools/src/utilities/voi/windowlevel/extractWindowLevelRegionToolData.ts
index 663ca7fe6d..9c1ce723b8 100644
--- a/packages/tools/src/utilities/voi/windowlevel/extractWindowLevelRegionToolData.ts
+++ b/packages/tools/src/utilities/voi/windowlevel/extractWindowLevelRegionToolData.ts
@@ -1,11 +1,13 @@
+import type { Types } from '@cornerstonejs/core';
 import {
-  VolumeViewport,
   utilities as csUtils,
-  cache,
   StackViewport,
+  VolumeViewport,
 } from '@cornerstonejs/core';
 
-function extractWindowLevelRegionToolData(viewport) {
+function extractWindowLevelRegionToolData(
+  viewport: Types.IVolumeViewport | Types.IStackViewport
+) {
   if (viewport instanceof VolumeViewport) {
     return extractImageDataVolume(viewport);
   }
@@ -16,7 +18,7 @@ function extractWindowLevelRegionToolData(viewport) {
   throw new Error('Viewport not supported');
 }
 
-function extractImageDataVolume(viewport) {
+function extractImageDataVolume(viewport: Types.IVolumeViewport) {
   const { scalarData, width, height } =
     csUtils.getCurrentVolumeViewportSlice(viewport);
   const { min: minPixelValue, max: maxPixelValue } =
@@ -33,7 +35,7 @@ function extractImageDataVolume(viewport) {
   };
 }
 
-function extractImageDataStack(viewport) {
+function extractImageDataStack(viewport: Types.IStackViewport) {
   const imageData = viewport.getImageData();
   const { scalarData } = imageData;
   const { min: minPixelValue, max: maxPixelValue } =