# MRtrix 3.0 (release candidate 2)

**URL:** <https://community.mrtrix.org/t/mrtrix-3-0-release-candidate-2/1065>\
**Category:** Announcements\
**Tags:** update, release\
**Created:** [July 31, 2017, 5:50am UTC](https://community.mrtrix.org/t/mrtrix-3-0-release-candidate-2/1065 "2017-07-31T05:50:46Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![rsmith](https://community.mrtrix.org/user_avatar/community.mrtrix.org/rsmith/32/2672_2.png) [@rsmith](https://community.mrtrix.org/u/rsmith)\
**Post date:** [August 1, 2017, 10:37pm UTC](https://community.mrtrix.org/t/mrtrix-3-0-release-candidate-2/1065/5 "2017-08-01T22:37:12Z")

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### `fixelcfestats` now supports `-mask` option

Due to popular demand (including my own), `fixelcfestats` now has a new option `-mask`. Note that this is a _fixel_ mask, _not_ a 3D voxel mask image.

Additionally, during the process of implementing this, I changed some of the internal fixel stats code such that, for my own test case, I experienced a 75% reduction in execution time 💪 (Note that in some instances, the memory usage of `fixelcfestats` may appear to drop drastically during permutation testing, e.g. from 50% to 4%; this is not cause for concern).

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_[View the full topic](https://community.mrtrix.org/t/mrtrix-3-0-release-candidate-2/1065)._