# Good b-value sensitivity parameter for 2shell

**URL:** <https://community.mrtrix.org/t/good-b-value-sensitivity-parameter-for-2shell/1770>\
**Category:** Uncategorized\
**Created:** [July 19, 2018, 3:25pm UTC](https://community.mrtrix.org/t/good-b-value-sensitivity-parameter-for-2shell/1770 "2018-07-19T15:25:03Z")\
**Posts on this page:** 1\
**Page:** 2

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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:** [January 2, 2020, 12:35am UTC](https://community.mrtrix.org/t/good-b-value-sensitivity-parameter-for-2shell/1770/21 "2020-01-02T00:35:19Z")

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> DWI multiband sequence from CMRR (Minnesota) on Prisma does not support storage of complex data

Are you sure? I’m doing this on our Prisma here. It’s a very general setting in the protocol editor that exists at a lower level than the particulars of any specific sequence. You need to change “Reconstruction” to “Magnitude and phase”, and then convert the resulting two DICOM series to native complex data using `mrcalc`, specifically scaling the phase data to Radians and then using the `-polar` option that was added to the `dev` branch in [#1659](https://github.com/MRtrix3/mrtrix3/pull/1659).

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