I am wondering which bvecs to use in our DTI processing. Per the FSL documentation suggestions, I first tried using dcm2nii to convert DICOM to nii, which seemed to produce usable bvec files. I soon discovered that it could not create proper nii files using our Siemens 7T DICOM files. I then tried MRIConvert, which has yet to fail converting any of our DICOM files and has produced bvec viles that seems to work fine. However, I am confused about the differences in the bvecs produced by these two programs, which are both different from the generic bvecs our Siemens physicist has given us. For the most part, the MRIConvert bvecs match the Siemens ones in value, but not sign. Two or three of the components are reversed in sign. I do not see how all three of these sets of bvecs can produce what visually look like very similar results (FA and V1), when the apparent directions are different.
1. What do other FSL users employ for DICOM to nii conversion?
2. Does anyone else out there use FSL for 7T DTI?
Thanks.
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