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Mike,

 have you tried the script here for making ROIs? http://montilab.psych.ucla.edu/fmri-wiki/

 Naively, might have to do either with the precision or the mask you are using to make the ROI from.

cheers


From: FSL - FMRIB's Software Library <[log in to unmask]> on behalf of Mike <[log in to unmask]>
Sent: 21 May 2017 14:36
To: [log in to unmask]
Subject: [FSL] spherical mask problem
 
Hi,

I tried to use the following command to create a spherical mask:

fslmaths point_56_n28_52.nii.gz -kernel sphere 10 -fmean -bin sphere_r10

(point_56_n28_52.nii.gz is a single voxel located in the MNI coordinate 56/-28/52, center of the sphere)

When the radius was 6, 8, or 10, it worked well. But when the radius was 12 or 15, it looked weird:

http://imgur.com/a/O6PGs


Does anyone know why?

Mike