Smoothing

Smooth the surface of segments for better quality models.

• The Smoothing tool allows users to refine the surface of segments by applying various smoothing methods, which helps in creating more accurate and aesthetically pleasing models.

Steps:

• Choose the Smoothing tool from the tools panel.
• Choose a smoothing algorithm from the method dropdown (see options below).
• Set the kernel size in millimeters. Larger kernels produce more aggressive smoothing
• Click and drag in the view to apply smoothing interactively to a specific area, or click Apply to smooth the entire segment. Note: interactive dragging is not available for joint smoothing.

Additional Information

Smoothing Method

• Select the smoothing algorithm that best fits your use case:

  • Median: Reduces noise in the segment while preserving sharp boundaries between structures.

  • Opening (remove extrusions): Removes small surface protrusions and cleans up jagged segment edges.

  • Closing (fill holes): Fills small interior holes and gaps within the segment boundary.

  • Gaussian: Applies a Gaussian blur for uniform, general-purpose smoothing of the segment surface.

  • Joint smoothing: Smooths all segments simultaneously while maintaining the interfaces between adjacent anatomical structures.

Kernel Size

• Enter the kernel size (in mm). The equivalent value in pixels is shown below for reference.

Brush Shape

• Circle, Square, and Lasso are the main types of brush shapes you can choose from.

Brush Size

• Adjusts the diameter of Circle brushes and the side length of Square brushes. Not applicable when using the Lasso shape.

Edit in 3D

• When active, painting and erasing operations apply directly in the 3D view. This option is enabled by default for the Lasso brush

Sphere Brush

• Available for the Circle brush only. When enabled, a 3D spherical brush is used, simultaneously affecting voxels across adjacent slices — useful for volumetric editing.