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Home < Documentation < Nightly < Modules < SegmentationSmoothing

For the stable Slicer documentation, visit the 4.6 page.

Introduction and Acknowledgements

SlicerProstate Logo 1.0 128x128.png

Extension: SlicerProstate
Acknowledgments: This work supported in part the National Institutes of Health, National Cancer Institute through the following grants:

  • Quantitative MRI of prostate cancer as a biomarker and guide for treatment, Quantitative Imaging Network (U01 CA151261, PI Fennessy)
  • Enabling technologies for MRI-guided prostate interventions (R01 CA111288, PI Tempany)
  • The National Center for Image-Guided Therapy (P41 EB015898, PI Tempany)
  • Quantitative Image Informatics for Cancer Research (QIICR) (U24 CA180918, PIs Kikinis and Fedorov).

Authors: Andrey Fedorov (SPL), Andras Lasso (Queen's University)
Contact: Andrey Fedorov,

License: Slicer License

National Center for Image Guided Therapy (NCIGT)  
Quantitative Image Informatics for Cancer Research  
Surgical Planning Laboratory (SPL)  

Module Description

This module can be used to generate a smooth surface segmentation for datasets that were segmented on images with large slice thickness, leading to "staircase" effect. This module was motivated by the need to generate smooth segmentations for prostate MRI images, which typically have high in-plane resolution (0.5mm) relative to the slice thickness (3mm).

The module operates by resampling the input to isotropic voxel resolution and applying Gaussian smoothing to the resampled image. Note that the resulting image will have larger size than the input.

Visualization of the segmentation surface before (green) and after (blue) smoothing using this module. Surfaces for this example were generated without using any decimation or smoothing in the ModelMaker module.

Use Cases

  • MRI-ultrasound fusion biopsy of the prostate (primary)
  • therapy planning
  • treatment response assessment


None at this time ... stay tuned!


  • IO: Input/output parameters
    • Input label (inputImageName): Input segmentation label
    • Output label (outputImageName): Smoothed segmentation label
    • Label to process (labelNumber): Label to smooth in the input label image. Default value of -1 will threshold the input image between 1 and 255 and will apply smoothing to the result.

List of parameters generated transforming this XML file using this XSL file. To update the URL of the XML file, edit this page.

Similar Modules


[1] Fedorov A, Khallaghi S, Antonio Sánchez C, Lasso A, Fels S, Tuncali K, Neubauer Sugar E, Kapur T, Zhang C, Wells W, Nguyen PL, Abolmaesumi P, Tempany C. (2015) Open-source image registration for MRI–TRUS fusion-guided prostate interventions. Int J CARS: 1–10. Available:

[2] Fedorov A, Nguyen PL, Tuncali K, Tempany C. (2015). Annotated MRI and ultrasound volume images of the prostate. Zenodo.

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