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All subjects will only share the same gradient table if the FOV was not rotated when the subjects were scanned. If it was, then the outputted bvecs file will need to reflect these rotations. Peace, Matt. -----Original Message----- From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf Of Yuzheng HU Sent: Monday, May 04, 2009 2:54 AM To: [log in to unmask] Subject: [FSL] gradient table for Philips 3T scanner Dear FSL user. Our DTI data were obtained from a Philips Achieva 3T scanner with 15 diffusion direction. When I used dcm2niigui.exe to transfer data format from DICOM to NIFTI, there was a .bval and a .bvec file automatically produced for each subject. I once thought they should be the b-value file and the diffusion gradient table file. However, all the .bvec files are different from each other, and someone told me that all the subjects should share the same gradient table if they underwent the same scanning protocol. Is that true? I used respective .bvec file for each subject in DTIFit program, and it seems to work well. would someone told me that if I need to find out a gradient table shared by all subjects? Thanks a lot! Yuzheng