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Hi Claudia, if you want to rotate bvecs, you can use the script that Saad has posted to the list: https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind1205&L=FSL&P=R25880&1=FSL&9=A&J=on&d=No+Match%3BMatch%3BMatches&z=4 Cheers Stam On 27 Nov 2012, at 14:12, Claudia Piervincenzi wrote: > Hi all, > > I have problems to analyze dti data in which the subject's head (a monkey..) was not completely aligned with the anterior-posterior commissure (really crooked!). I wanted to know if it is possible to adjust the volumes properly and hence how to correct the B-matrix. > I tried to adjust the 4D file with mricron, but I don't know how to correct the B-matrix for the rotation applied.. > > thanks in advance for any advice / help! > > Claudia >