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Hi - not sure, I have never tried changing the prior images. It is possible that there may be a problem with the registration (check that avg152T1_brain.hdr is sensible) or there may be a problem with your prior images - do they all contain a reasonable range of values from 0:1? You can debug the registration by running the same flirt command that fast tells you it is running and adding on the -o <output> option to see whether it has worked. Thanks, Steve. On Wed, 13 Aug 2003, Nathan Walters wrote: > Hi, I have previously used subject specific a priori maps with FAST by > replacing the standard images. I am now having a problem in that it gives a > segmentation fault (which doesn't happen if i remove the -a option). I have > encountered this problem before but I found it was specific to a particular > machine and didn't happen on others - making me think it is something simple, > but what exactly escapes me. Could someone help? > > Nathan Walters > > PhD student, > University of Sydney, Australia > Stephen M. Smith MA DPhil CEng MIEE Associate Director, FMRIB and Analysis Research Coordinator Oxford University Centre for Functional MRI of the Brain John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve