# How to properly segment the coronary artery, if it has stenosis?

**URL:** <https://discourse.slicer.org/t/how-to-properly-segment-the-coronary-artery-if-it-has-stenosis/22819>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [April 4, 2022, 3:01pm UTC](https://discourse.slicer.org/t/how-to-properly-segment-the-coronary-artery-if-it-has-stenosis/22819 "2022-04-04T15:01:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Almagul](https://avatars.discourse-cdn.com/v4/letter/a/ee7513/32.png) [@Almagul](https://discourse.slicer.org/u/Almagul)\
**Post date:** [April 4, 2022, 3:01pm UTC](https://discourse.slicer.org/t/how-to-properly-segment-the-coronary-artery-if-it-has-stenosis/22819/1 "2022-04-04T15:01:28Z")

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hello, I’m having difficulty segmenting the coronary arteries in the area of stenosis. tell me how to properly segment the coronary artery, if it has stenosis?  
I need the artery to become narrower in the area of stenosis. I use the instrument “threshold”, but a hole appears in the artery, not a narrowing.