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Hi Jon, Can you run bedpost_datacheck on the directory and email us the output. That should solve any easy problems. Thanks Tim ------------------------------------------------------------------------------- Tim Behrens Centre for Functional MRI of the Brain The John Radcliffe Hospital Headley Way Oxford OX3 9DU Oxford University Work 01865 222782 Mobile 07980 884537 ------------------------------------------------------------------------------- On Tue, 26 Oct 2004, Jon Clayden wrote: > Hi, > > I'm running FSL 3.2 on MacOS X.3.5, and I'm having trouble with dtifit. > The directory with the files in looks like this: > > total 328784 > -rw-r--r-- 1 jon jon 364 26 Oct 15:44 bvals > -rw-r--r-- 1 jon jon 2370 26 Oct 15:59 bvecs > -rw-r--r-- 1 jon jon 348 26 Oct 15:58 data.hdr > -rw-r--r-- 1 jon jon 81788928 26 Oct 15:58 data.img > -rw-r--r-- 1 jon jon 10010 26 Oct 15:58 data_ec.ecclog > -rw-r--r-- 1 jon jon 348 26 Oct 15:58 data_ec.hdr > -rw-r--r-- 1 jon jon 81788928 26 Oct 15:58 data_ec.img > -rw-r----- 1 jon jon 348 26 Oct 15:40 fT2W_av.hdr > -rw-r----- 1 jon jon 1572864 26 Oct 15:40 fT2W_av.img > -rw-r--r-- 1 jon jon 348 26 Oct 16:06 nodif.hdr > -rw-r--r-- 1 jon jon 1572864 26 Oct 16:06 nodif.img > -rw-r--r-- 1 jon jon 348 26 Oct 16:06 nodif_mask.hdr > -rw-r--r-- 1 jon jon 1572864 26 Oct 16:06 nodif_mask.img > > where data_ec.* were produced by running eddy_correct on data.*, and > nodif* were produced by running bet on the fT2W_av.* files. When I try > to run dtifit, I get this error (last line): > > jon$ dtifit -k data_ec -o dti -m nodif_mask -r bvecs -b bvals -V > data file data_ec > mask file nodif_mask > bvecs bvecs > bvals bvals > reading data > reading mask > ok > 0 128 0 128 0 48 > setting up vols > copying input properties to output volumes > zeroing output volumes > ok > Forming A matrix > Abort trap > > and then it immediately quits. Can anyone shed any light on why this > may be happening? > > Thanks, > Jon Clayden >