# What was the mother wavelet function used for computing the wavelet features by SlicerRadiomic?

**URL:** <https://discourse.slicer.org/t/what-was-the-mother-wavelet-function-used-for-computing-the-wavelet-features-by-slicerradiomic/13071>\
**Category:** Radiomics\
**Created:** [August 18, 2020, 1:22pm UTC](https://discourse.slicer.org/t/what-was-the-mother-wavelet-function-used-for-computing-the-wavelet-features-by-slicerradiomic/13071 "2020-08-18T13:22:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![danceward](https://avatars.discourse-cdn.com/v4/letter/d/7c8e57/32.png) [@danceward](https://discourse.slicer.org/u/danceward)\
**Post date:** [August 18, 2020, 1:22pm UTC](https://discourse.slicer.org/t/what-was-the-mother-wavelet-function-used-for-computing-the-wavelet-features-by-slicerradiomic/13071/1 "2020-08-18T13:22:15Z")

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Hello, I am doing some work about radiomic feature extraction from chest CT by SlicerRadiomic, and I want to know what was the mother wavelet function used for computing the wavelet features? Thanks!

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**Author:** ![fedorov](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fedorov/32/14_2.png) [@fedorov](https://discourse.slicer.org/u/fedorov)\
**Post date:** [August 28, 2020, 2:19am UTC](https://discourse.slicer.org/t/what-was-the-mother-wavelet-function-used-for-computing-the-wavelet-features-by-slicerradiomic/13071/2 "2020-08-28T02:19:16Z")

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SlicerRadiomics is using [pyradiomics](https://github.com/Radiomics/pyradiomics) for feature extraction, which in turn is using [pywavelets](https://pywavelets.readthedocs.io/en/latest/ref/wavelets.html) for wavelet decomposition (see this [code](https://github.com/Radiomics/pyradiomics/blob/master/radiomics/imageoperations.py#L831-L883)). The default type of wavelet decomposition pyradiomics is using is `coif1`.