Dear experts

I was wondering whether there is a way to create an overlapping fixel mask of 2 separate analyses?

Cheers,

Hamed

# FBA: creating intersection fixel mask

**Hamed**#1

Hi Hamed,

To compute the intersection of 2 binary fixel masks, you can simply use `mrcalc`

, as long as both masks are of course defined for the same set of fixels (i.e. have the same `index.mif`

and `directions.mif`

file). If you don’t have binary masks yet, you’d first get them from e.g. your FBA results by applying `mrthreshold`

with the `-abs`

option to the relevant FBA output (e.g. the p-value map). Then simply run `mrcalc mask1.mif mask2.mif -min intersectionmask.mif`

to compute the intersection. Make sure the output ("`intersectionmask.mif`

") also ends up in a folder with the same `index.mif`

and `directions.mif`

files (or copies of them). Similarly, if you’d be after the “union” mask (rather than the intersection), you can use `mrcalc`

, but with the `-max`

operator.

Cheers,

Thijs