diff --git a/Modules/Filtering/FastMarching/include/itkLevelSet.h b/Modules/Filtering/FastMarching/include/itkLevelSet.h
index 9729f7873e8..a339b82e933 100644
--- a/Modules/Filtering/FastMarching/include/itkLevelSet.h
+++ b/Modules/Filtering/FastMarching/include/itkLevelSet.h
@@ -58,7 +58,7 @@ class LevelSetTypeDefault
   using NodeType = LevelSetNode<PixelType, Self::SetDimension>;
 
   /** NodeContainer type alias support */
-  using NodeContainer = VectorContainer<unsigned int, NodeType>;
+  using NodeContainer = VectorContainer<NodeType>;
 
   /** NodeContainerPointer type alias support */
   using NodeContainerPointer = typename NodeContainer::Pointer;
diff --git a/Modules/Filtering/FastMarching/wrapping/ITKFastMarchingBase.wrap b/Modules/Filtering/FastMarching/wrapping/ITKFastMarchingBase.wrap
index cae473ef928..2aab2e4493d 100644
--- a/Modules/Filtering/FastMarching/wrapping/ITKFastMarchingBase.wrap
+++ b/Modules/Filtering/FastMarching/wrapping/ITKFastMarchingBase.wrap
@@ -4,7 +4,7 @@ itk_wrap_include("itkLevelSetNode.h")
 itk_wrap_class("itk::VectorContainer" POINTER)
 foreach(d ${ITK_WRAP_IMAGE_DIMS})
   foreach(t ${WRAP_ITK_SCALAR})
-    itk_wrap_template("${ITKM_UI}${ITKM_LSN${t}${d}}" "${ITKT_UI},${ITKT_LSN${t}${d}}")
+    itk_wrap_template("${ITKM_IT}${ITKM_LSN${t}${d}}" "${ITKT_IT},${ITKT_LSN${t}${d}}")
     itk_wrap_template("${ITKM_IT}NPI${d}${ITKM_${t}}" "${ITKT_IT}, itk::NodePair< itk::Index<${d}>, ${ITKT_${t}} >")
   endforeach()
 endforeach()
diff --git a/Modules/Filtering/FastMarching/wrapping/test/FastMarchingImageFilterTest.py b/Modules/Filtering/FastMarching/wrapping/test/FastMarchingImageFilterTest.py
index ecc67555543..05c8dc1bfcc 100644
--- a/Modules/Filtering/FastMarching/wrapping/test/FastMarchingImageFilterTest.py
+++ b/Modules/Filtering/FastMarching/wrapping/test/FastMarchingImageFilterTest.py
@@ -128,7 +128,7 @@
 sigmoid.SetBeta(beta)
 
 NodeType = itk.LevelSetNode[InternalPixelType, Dimension]
-NodeContainer = itk.VectorContainer[itk.UI, NodeType]
+NodeContainer = itk.VectorContainer[itk.IT, NodeType]
 seeds = NodeContainer.New()
 
 seedPosition = [int(argv[3]), int(argv[4])]
diff --git a/Modules/Segmentation/LevelSets/include/itkShapePriorMAPCostFunctionBase.h b/Modules/Segmentation/LevelSets/include/itkShapePriorMAPCostFunctionBase.h
index 6891c80dd0d..1f81bf83252 100644
--- a/Modules/Segmentation/LevelSets/include/itkShapePriorMAPCostFunctionBase.h
+++ b/Modules/Segmentation/LevelSets/include/itkShapePriorMAPCostFunctionBase.h
@@ -81,7 +81,7 @@ class ITK_TEMPLATE_EXPORT ShapePriorMAPCostFunctionBase : public SingleValuedCos
   using NodeType = LevelSetNode<PixelType, Self::ImageDimension>;
 
   /** Type of container used to store the level set nodes. */
-  using NodeContainerType = VectorContainer<unsigned int, NodeType>;
+  using NodeContainerType = VectorContainer<NodeType>;
   using NodeContainerPointer = typename NodeContainerType::ConstPointer;
 
   /** Type of the shape signed distance function. */
diff --git a/Modules/Segmentation/LevelSets/wrapping/test/GeodesicActiveContourImageFilterTest.py b/Modules/Segmentation/LevelSets/wrapping/test/GeodesicActiveContourImageFilterTest.py
index a937549c0e3..bd74ad26e8a 100644
--- a/Modules/Segmentation/LevelSets/wrapping/test/GeodesicActiveContourImageFilterTest.py
+++ b/Modules/Segmentation/LevelSets/wrapping/test/GeodesicActiveContourImageFilterTest.py
@@ -103,7 +103,7 @@ def main():
     node.SetIndex(seedPosition)
 
     seeds = itk.VectorContainer[
-        itk.UI, itk.LevelSetNode[InternalPixelType, Dimension]
+        itk.IT, itk.LevelSetNode[InternalPixelType, Dimension]
     ].New()
     seeds.Initialize()
     seeds.InsertElement(0, node)
diff --git a/Modules/Segmentation/LevelSets/wrapping/test/ShapePriorMAPCostFunctionInitializeTest.py b/Modules/Segmentation/LevelSets/wrapping/test/ShapePriorMAPCostFunctionInitializeTest.py
index f3c4fa6ad7a..113fe5539c0 100644
--- a/Modules/Segmentation/LevelSets/wrapping/test/ShapePriorMAPCostFunctionInitializeTest.py
+++ b/Modules/Segmentation/LevelSets/wrapping/test/ShapePriorMAPCostFunctionInitializeTest.py
@@ -111,7 +111,7 @@ def check(condition, description):
 # fills them in from the fast-marching output and the sigmoid
 # edge-potential map.
 NodeType = itk.LevelSetNode[InternalPixelType, Dimension]
-NodeContainerType = itk.VectorContainer[itk.UI, NodeType]
+NodeContainerType = itk.VectorContainer[itk.IT, NodeType]
 active_region = NodeContainerType.New()
 cost_function.SetActiveRegion(active_region)
 
diff --git a/Modules/Segmentation/LevelSets/wrapping/test/ThresholdSegmentationLevelSetImageFilterTest.py b/Modules/Segmentation/LevelSets/wrapping/test/ThresholdSegmentationLevelSetImageFilterTest.py
index dfd14c314d9..e9c8229d49e 100644
--- a/Modules/Segmentation/LevelSets/wrapping/test/ThresholdSegmentationLevelSetImageFilterTest.py
+++ b/Modules/Segmentation/LevelSets/wrapping/test/ThresholdSegmentationLevelSetImageFilterTest.py
@@ -101,7 +101,7 @@
 writer.SetInput(thresholder.GetOutput())
 
 NodeType = itk.LevelSetNode[InternalPixelType, Dimension]
-NodeContainer = itk.VectorContainer[itk.UI, NodeType]
+NodeContainer = itk.VectorContainer[itk.IT, NodeType]
 seeds = NodeContainer.New()
 seedPosition = [int(argv[3]), int(argv[4])]