# Measuring angles from vector field

**URL:** <https://discourse.slicer.org/t/measuring-angles-from-vector-field/12299>\
**Category:** Support\
**Created:** [June 30, 2020, 3:01pm UTC](https://discourse.slicer.org/t/measuring-angles-from-vector-field/12299 "2020-06-30T15:01:28Z")\
**Posts on this page:** 1\
**Showing post:** 4

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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 30, 2020, 9:19pm UTC](https://discourse.slicer.org/t/measuring-angles-from-vector-field/12299/4 "2020-06-30T21:19:00Z")

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> [@Yordano\_Jimenez](#):
>
> One final question, is it possible to measure relative to a curved plane? The CT scan has a fish in a bent position, so a straight reference plane would yield undesired measurements.

This should be no problem at all. I would straighten the volume using Curved Planar Reformatting module (in Sandbox extension) and then compute everything on the straightened volume. See for example this post:

> [@How to implement CPR (curved planar reconstruction) from centerline?](https://discourse.slicer.org/t/how-to-implement-cpr-curved-plannar-reconstruction-from-centerline/9456/7):
>
> Hi Andras, Sometimes people end up having to scan coiled snakes, or fish that are in little jars. Depending on what they need to do with it, they may have to ‘straighten’ the specimen. Is there a way this CPR can be generalized for such use cases? [image] [image]

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