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Hi - I'm not sure what's causing this problem - If you can tar up the whole input directory and put it on the web somewhere, I'd be happy to take a quick look. More generally, this data is not really appropriate for diffusion tractography. We would recommend at least 25 diffusion directions and image resolution of 2.5mmx2.5mmx2.5mm or better as a good starting point. T ------------------------------------------------------------------------------- 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 Mon, 25 Oct 2004, Erin Gibson wrote: > Here is the output: > > ./data > dim1 128 > dim2 128 > dim3 22 > dim4 12 > datatype 4 > pixdim1 -1.8750000000 > pixdim2 1.8750000000 > pixdim3 4.0000000000 > pixdim4 1.0000000000 > cal_max 0.0000 > cal_min 0.0000 > glmax 0 > glmin 0 > origin1 0 > origin2 0 > origin3 0 > file_type ANALYZE-7.5 > > ./nodif > dim1 128 > dim2 128 > dim3 22 > dim4 1 > datatype 4 > pixdim1 1.8750000000 > pixdim2 1.8750000000 > pixdim3 4.0000000000 > pixdim4 0.0000000000 > cal_max 0.0000 > cal_min 0.0000 > glmax 4513 > glmin 0 > origin1 0 > origin2 0 > origin3 0 > file_type ANALYZE-7.5 > > ./nodif_brain_mask > dim1 128 > dim2 128 > dim3 22 > dim4 1 > datatype 4 > pixdim1 1.8750000000 > pixdim2 1.8750000000 > pixdim3 4.0000000000 > pixdim4 0.0000000000 > cal_max 0.0000 > cal_min 0.0000 > glmax 32767 > glmin 0 > origin1 0 > origin2 0 > origin3 0 > file_type ANALYZE-7.5 > > num lines in ./bvals > 1 > num words in ./bvals > 12 > num lines in ./bvecs > 3 > num words in ./bvecs > 36 > > Thanks for your help. >