# Identifying which slice in DTI stack corresponds to b(not) value

**URL:** <https://discourse.slicer.org/t/identifying-which-slice-in-dti-stack-corresponds-to-b-not-value/8332>\
**Category:** Support\
**Tags:** dti\
**Created:** [September 7, 2019, 7:32pm UTC](https://discourse.slicer.org/t/identifying-which-slice-in-dti-stack-corresponds-to-b-not-value/8332 "2019-09-07T19:32:26Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mshah](https://avatars.discourse-cdn.com/v4/letter/m/ee7513/32.png) [@mshah](https://discourse.slicer.org/u/mshah)\
**Post date:** [September 7, 2019, 7:32pm UTC](https://discourse.slicer.org/t/identifying-which-slice-in-dti-stack-corresponds-to-b-not-value/8332/1 "2019-09-07T19:32:26Z")

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Hi everyone,

I was wondering if there is a specific way in slicer to identify which image in a dti stack corresponds to the non weighted T2 image that corresponds to the b= 0 value? For example, the dimensions of my image stack is (25 256 256 26), meaning it is a dti image with 25 slices in 26 directions. which one of these 25 slices corresponds with the non weighted image? Is there anyway to check this in slicer?

thanks

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**Author:** ![ljod](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ljod/32/652_2.png) [@ljod](https://discourse.slicer.org/u/ljod)\
**Post date:** [September 7, 2019, 7:49pm UTC](https://discourse.slicer.org/t/identifying-which-slice-in-dti-stack-corresponds-to-b-not-value/8332/2 "2019-09-07T19:49:26Z")

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One way is to visualize in the Volumes module and see which components are bright (not diffusion weighted). There should be an example in the DTI tutorial here:  
[http://dmri.slicer.org/docs/](http://dmri.slicer.org/docs/)

Otherwise you can do this programatically or by looking at the image header in a text editor.

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**Author:** ![mshah](https://avatars.discourse-cdn.com/v4/letter/m/ee7513/32.png) [@mshah](https://discourse.slicer.org/u/mshah)\
**Post date:** [September 7, 2019, 8:36pm UTC](https://discourse.slicer.org/t/identifying-which-slice-in-dti-stack-corresponds-to-b-not-value/8332/3 "2019-09-07T20:36:58Z")

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Than you for the response! Which tutorial is it, I cant seem to find a relevant one? how does this correspond to the slice in the 25 256 256 26 array?