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fslmerge. Peace, Matt. -----Original Message----- From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf Of Jeff Eriksen Sent: Wednesday, January 20, 2010 8:27 PM To: [log in to unmask] Subject: [FSL] problem converting DCM to 4D NII files I was merrily going along in my tutorial and practical about FDT, with a particular subject's 3T and 7T data, using dcm2nii to convert DICOM to NII files (plus bvals and bvecs), calculating the tensors, viewing, etc. Then I tried another subject and the data looked very weird. I traced it back to dcm2nii, which converts NONE of this subject's DICOM file correctly, thought they look OK in several other viewers and can be used by DTI Studio just fine. I will have to report this to the MRIcron folks, I suppose. But first I tried MRIConvert from UO, and it converted everything to NII format (plus bvals and bvecs) fine based on viewing with MRIcron itself. The only difficulty is that it does not create 4D files, which FDT seems to require. Do you know if and how FSL can convert 3D to 4D files?