# Bone thickness heatmap along a perpendicular vectors

**URL:** <https://discourse.slicer.org/t/bone-thickness-heatmap-along-a-perpendicular-vectors/34729>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [March 5, 2024, 11:01pm UTC](https://discourse.slicer.org/t/bone-thickness-heatmap-along-a-perpendicular-vectors/34729 "2024-03-05T23:01:08Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![coLee](https://avatars.discourse-cdn.com/v4/letter/c/a9adbd/32.png) [@coLee](https://discourse.slicer.org/u/coLee)\
**Post date:** [March 5, 2024, 11:01pm UTC](https://discourse.slicer.org/t/bone-thickness-heatmap-along-a-perpendicular-vectors/34729/1 "2024-03-05T23:01:08Z")

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I am trying to create a thickness heatmap model of a segmented pelvis for preop planning of THA. The goal would be to create a heatmap showing the thickness where a screw could be placed. For this I figure I would need somehow to measure the distance between the inner and outer side of the model along a perpendicular vector to each surface.  
The problem I found with solutions show for craniectomy cases was that in the case of a pelvis I need the vectors to point outwards from the acetabulum, but with those methods i would get just the actual thickness of the model.

Do you have any suggestions?