# Unit of radius an length in VMTK centerline computation

**URL:** <https://discourse.slicer.org/t/unit-of-radius-an-length-in-vmtk-centerline-computation/28072>\
**Category:** Support\
**Tags:** vmtk\
**Created:** [February 27, 2023, 9:43am UTC](https://discourse.slicer.org/t/unit-of-radius-an-length-in-vmtk-centerline-computation/28072 "2023-02-27T09:43:01Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![LeeaLee12345](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/leealee12345/32/13478_2.png) [@LeeaLee12345](https://discourse.slicer.org/u/LeeaLee12345)\
**Post date:** [February 27, 2023, 9:43am UTC](https://discourse.slicer.org/t/unit-of-radius-an-length-in-vmtk-centerline-computation/28072/1 "2023-02-27T09:43:01Z")

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Dear all,  
I am using the VMTK extension to compute centerline and radius of the vessel along the centerline. I would like to ask if the unit of radius and length in this information is px? Thank you very much!

 ![question](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/0/d05adf7d627bd91e61fa2cc38554e85b64c0ce3a.png)