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Hi Thanks for that. The command 'fslmerge' isn't recognized for some reason, however, I have been able to make my 4D data file using 'avwmerge' instead. Unfortunately, when I try to process the data in DTIFit, I now get the error message: "Error: child killed: bus error". Would you be able to tell me how to fix this? Thanks very much for your help Patrick On 15 Oct 2007, at 11:14, Tim Behrens wrote: > You need to merge your data from different diffusion directions > into a single 4D nifti file - you can use fslmerge to do this. > > T > On 15 Oct 2007, at 09:52, Patrick Hales wrote: > >> Hi >> >> This is the first time I have tried using FSL, and I am trying to >> get the DTIFit program to work. I have >> a series of diffusion weighted images, each of which are stored as >> individual fid files (created using >> Varian's VnmrJ software). There are seven images in total, one >> with b=0 and 6 with diffusion >> gradients applied in non co-linear directions. I have converted >> each of these into Nifti format, and >> stored them all in a directory. I used FSLview to create my binary >> mask, and have created text files >> with my gradient directions (all normalized to unit length), and >> my b-values (in units of s/mm2). In >> the DTIFit program, I have selected 'specify input files >> manually', and supplied it with the directory >> containing my nifti files, and the filenames of my gradients and b- >> values text files. >> >> When I press 'go', I get a number of error messages, such as: >> 'ERROR: nifti_image_read(....directory >> name....)can't open header file', 'ERROR: nifti_image_open >> (...):bad header info', 'Error: failed to open >> file', etc. I get the same errors when I try it with analyze files. >> >> Would you be able to tell me what I'm doing wrong? Thanks very much >> >> Patrick Hales