# About the angle threshold for DTI?

**URL:** <https://discourse.slicer.org/t/about-the-angle-threshold-for-dti/17965>\
**Category:** Support\
**Created:** [June 5, 2021, 1:40pm UTC](https://discourse.slicer.org/t/about-the-angle-threshold-for-dti/17965 "2021-06-05T13:40:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![timeanddoctor](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/timeanddoctor/32/5839_2.png) [@timeanddoctor](https://discourse.slicer.org/u/timeanddoctor)\
**Post date:** [June 5, 2021, 1:40pm UTC](https://discourse.slicer.org/t/about-the-angle-threshold-for-dti/17965/1 "2021-06-05T13:40:54Z")

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![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/5/c5263f49d1fca3d2bbf27b2b3eb597d219764d36.png)  
Just as the pic, Can I set the angel in slicer?

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [June 8, 2021, 8:15pm UTC](https://discourse.slicer.org/t/about-the-angle-threshold-for-dti/17965/2 "2021-06-08T20:15:53Z")

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Slicer uses Radius of Curvature to control that parameter. Perhaps @ljod knows the exact mapping to angle, but I believe it’s `arcsin`, so .5 radius curvature would be 30 degrees.