# How to find radius with vmtk module

**URL:** <https://discourse.slicer.org/t/how-to-find-radius-with-vmtk-module/22183>\
**Category:** Support\
**Created:** [February 25, 2022, 4:26pm UTC](https://discourse.slicer.org/t/how-to-find-radius-with-vmtk-module/22183 "2022-02-25T16:26:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![alyssan](https://avatars.discourse-cdn.com/v4/letter/a/3da27b/32.png) [@alyssan](https://discourse.slicer.org/u/alyssan)\
**Post date:** [February 25, 2022, 4:26pm UTC](https://discourse.slicer.org/t/how-to-find-radius-with-vmtk-module/22183/1 "2022-02-25T16:26:48Z")

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Hello I am trying to find the radius at many different point along an uneven cylindrical surface. How can i do this using the vmtk module? Thank you

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**Author:** ![chir.set](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/chir.set/32/66982_2.png) [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Post date:** [February 25, 2022, 5:52pm UTC](https://discourse.slicer.org/t/how-to-find-radius-with-vmtk-module/22183/2 "2022-02-25T17:52:55Z")

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> [@alyssan](#):
>
> find the radius at many different point along an uneven cylindrical surface

Unless I misunderstood your requirements, you could use ‘Extract centerline’ module, followed by ‘Cross-section analysis’.