# Single shell DTI-data

**URL:** https://community.mrtrix.org/t/single-shell-dti-data/4468
**Category:** Uncategorized
**Created:** [January 14, 2021, 10:12am UTC](https://community.mrtrix.org/t/single-shell-dti-data/4468 "2021-01-14T10:12:53Z")
**Posts on this page:** 1
**Showing post:** 3

<div class="post-metadata">

### Author: ![jdtournier](https://community.mrtrix.org/user_avatar/community.mrtrix.org/jdtournier/32/2594_2.png) [@jdtournier](https://community.mrtrix.org/u/jdtournier)
#### Post date: [January 14, 2021, 12:14pm UTC](https://community.mrtrix.org/t/single-shell-dti-data/4468/3 "2021-01-14T12:14:56Z")

</div>

There is actually a [page on the documentation about using single-shell data](https://mrtrix.readthedocs.io/en/latest/fixel_based_analysis/st_fibre_density_cross-section.html). However, you can do better than this these days, since even single-shell data effectively contains 2 shells: the _b_=0 volumes qualify as a ‘shell’ in this context (we need to update the docs to reflect that… 😳). So you should be able to use your data in more or less exactly the same way as outlined in the BATMAN tutorial, with the only change being the `dwi2fod` call, as [outlined in this post](https://community.mrtrix.org/t/fba-single-shell-high-gm-fod-values/1746/3) and [referred to in this post](https://community.mrtrix.org/t/dwi2fod-with-fa-as-mask/2614/5).

Also: bear in mind that the original CSD method was developed for single-shell data, and is still usable here. It’s not as clean as what you can get with the recommendations above though, but it is nonetheless an option (invoke with `dwi2fod csd`).

---

_[View the full topic](https://community.mrtrix.org/t/single-shell-dti-data/4468)._