# Segmentation of thin vessels

**URL:** <https://discourse.slicer.org/t/segmentation-of-thin-vessels/24082>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [June 27, 2022, 6:38pm UTC](https://discourse.slicer.org/t/segmentation-of-thin-vessels/24082 "2022-06-27T18:38:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![sannpeterson](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sannpeterson/32/10892_2.png) [@sannpeterson](https://discourse.slicer.org/u/sannpeterson)\
**Post date:** [June 27, 2022, 6:38pm UTC](https://discourse.slicer.org/t/segmentation-of-thin-vessels/24082/1 "2022-06-27T18:38:25Z")

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Thank you for the suggestion. Can you give me tips for smaller vessels? Some arteries are very thin and hypoplastic. More automated methods tend to miss these types of vessels.

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [June 27, 2022, 7:16pm UTC](https://discourse.slicer.org/t/segmentation-of-thin-vessels/24082/2 "2022-06-27T19:16:10Z")

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You can use Grow from seeds effect for smaller vessels, too, you just need to paint more seeds: with your initial seeds some vessel segments will be missed, so you paint a few more, which will result in some noise to be detected as vessels, so you need to paint scribbles there with the “non-vessel” segment, and do this iteratively until you get all the vessels you need, without noise.

If the vessels are very small then you can simplify segmentation by doing subtraction. See [this segmentation recipe](https://lassoan.github.io/SlicerSegmentationRecipes/VesselSegmentationBySubtraction/).