# Cross-section analysis

**URL:** <https://discourse.slicer.org/t/cross-section-analysis/44912>\
**Category:** Support\
**Created:** [October 29, 2025, 10:14am UTC](https://discourse.slicer.org/t/cross-section-analysis/44912 "2025-10-29T10:14:24Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![bserrano](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/bserrano/32/17034_2.png) [@bserrano](https://discourse.slicer.org/u/bserrano)\
**Post date:** [October 29, 2025, 10:14am UTC](https://discourse.slicer.org/t/cross-section-analysis/44912/1 "2025-10-29T10:14:25Z")

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Hi all,

We are using cross-section analysis to extract vessel radius. For some centerline nodes, the module prints the message _“Consider improving the input surface”_ and then gives an error when attempting to extract the radius at those points (see video below).

After smoothing the geometry, the issue disappears (see video below).

How can we proactively detect and address these kinds of issues? The geometry appeared correct from the start, so it’s unclear why the errors occur.

Thanks 🙂

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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:** [October 29, 2025, 1:03pm UTC](https://discourse.slicer.org/t/cross-section-analysis/44912/2 "2025-10-29T13:03:02Z")

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> [@bserrano](#):
>
> proactively detect and address

It has not been possible to identify segments that would generate empty cross-sections. If observed, it should be addressed by any means as you did. For people who do not use the python console, such situations become apparent in the plot chart.

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**Author:** ![SANTIAGO\_PENDON\_MING](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/santiago_pendon_ming/32/66060_2.png) [@SANTIAGO\_PENDON\_MING](https://discourse.slicer.org/u/SANTIAGO_PENDON_MING)\
**Post date:** [November 10, 2025, 7:49am UTC](https://discourse.slicer.org/t/cross-section-analysis/44912/3 "2025-11-10T07:49:12Z")

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Hi to everyone!

Today I am facing the same issue:

The first image crashes the CSA module in the red point

 ![Captura de pantalla 2025-11-10 084250](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/2/6/26f0eb6c74ee095302b29aa14050175a59ffa55d.jpeg)

But, this image with the ‘spiked voxel’ cleaned do not breaks the execution in the red point.

 ![Captura de pantalla 2025-11-10 084319](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/7/4/74b9404cb88a14fb0717b3570f9dcfb440cb2e49.jpeg)

Any idea of how to automatically repair it? Or what is exactly crashing inside the CSA module?