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Not sure but some things to try: look at the headers using fslhd to double check the voxel dimensions and extents reported by FSLview; re-check that there were no acquisition differences; has any pre-processing occurred which may explain things (e.g., co-registration if different reference images were used)? On 15 Apr 2010, at 08:25, Mark Shen wrote: > Hi FSL experts, > > I am inspecting the FA maps for 76 subjects on FSLview. When I click the overlay information for each fA map, 50 of the FA maps say voxels=122x122x68, but 26 say voxels=81x106x76. FSLview will not let the different FA maps overlay on each other because of "incompatible dimensions." However, the overlay information has the correct voxel dimensions for all FA maps as 2x2x2mm. > > Why the discrepancy, even though all subjects were acquired identically? More importantly, would this affect the ability to include all subjects in a TBSS analysis, specifically for the tbss_2_reg -n flag to coregister each FA map to each other? > > Thank you, > Mark Shen > > M.I.N.D. Institute > University of California, Davis > -- Dave Flitney, IT Manager Oxford Centre for Functional MRI of the Brain E:[log in to unmask] W:+44-1865-222713 F:+44-1865-222717 URL: http://www.fmrib.ox.ac.uk/~flitney