CODEWITHSUNDEEP
image-processingimage-segmentationitkmedical-imagingsimpleitk
Alex1111
Alex1111

Reputation: 1

How to decide the value of the sigma value to use for the SimpleITK Filter: SmoothingRecursiveGaussianImageFilter depending on the voxel size?

I am using a code similar to this example in order to smooth voxel volume data (so from a CTA scan): https://examples.itk.org/src/filtering/smoothing/computessmoothingwithgaussiankernel/documentation
and wondering, what sigma value to use? Does it depend on the voxel size, because I have heard that the sigma value should be around 3 times the voxel size, but I am unsure, why this should be the case?

I have a voxel size of around 0.3 mm, so I have used a sigma value of around 1. This has worked decently, but I am not sure why and would like to understand this? Thank you very much for any help, especially on wat sigma values to use or how this filter works!

Upvotes: 0

Views: 295

Answers (1)

Dženan
Dženan

Reputation: 3395

The proper choice of smoothing sigma depends on what you are trying to accomplish, not just the pixel spacing. To learn more, you could pick one of the courses that use ITK.

Upvotes: 0

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