# Strange fiber structure for HCP data

**URL:** https://community.mrtrix.org/t/strange-fiber-structure-for-hcp-data/947
**Category:** Uncategorized
**Created:** [June 7, 2017, 11:33am UTC](https://community.mrtrix.org/t/strange-fiber-structure-for-hcp-data/947 "2017-06-07T11:33:12Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![jiangjiane](https://community.mrtrix.org/user_avatar/community.mrtrix.org/jiangjiane/32/1531_2.png) [@jiangjiane](https://community.mrtrix.org/u/jiangjiane)
#### Post date: [June 8, 2017, 2:35am UTC](https://community.mrtrix.org/t/strange-fiber-structure-for-hcp-data/947/3 "2017-06-08T02:35:47Z")

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Hi @Zonglei,  
Thank you for reminding me!  
Yup, maybe the curvature radius is too small ever before, but the phenomenon still exists after I changed the angle from 45° (R=0.866mm) to 36° (R=1mm), even 24° (R=1.5mm):

-angle 36

 ![](https://community.mrtrix.org/uploads/default/original/1X/28ec5d0f15f130babbb9e3d3a986fc613ddf4bf9.png)

-angle 24

 ![](https://community.mrtrix.org/uploads/default/original/1X/15072818f83e55a21363fe11c403a8d1bfd3692a.png)

I am very confused and hope to get the answer!  
Jian

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