We are trying to average multiple DWI scans (like 8 or 9) from the same subject. We have had success averaging the FAC and S0 image, the results are spectacular and there is little reason it won’t be rather simple to extend this to other metrics such as AD, adc or FA.
However we would like to explore ways to average something more fundamental, such as the tensor, or maybe even a more complex diffusion model.
The problem we have is that these repeated acquisitions have different bvecs and bvals.
Our first (rather simplistic) attempt to average the tensor image by applying the transform to each of the 6 tensor components resulted in a reasonably looking file.
However tensor2metric complains that it is lacking a diffusion gradient table, which is not surprising I guess.