I am trying to do TBSS on a population of MS-patients. My DTI images are distortion corrected during scanning and therefore I assume topup is not necessary. However, if I skip topup, then I am missing an output that’s needed for the next step, eddy correction (using “eddy” command). Anyone that can recommend a solution for this? Should I just use eddy_cuda? “eddy_correct” could be an alternative but I’ve read that it should be avoided.