Hello,
I just started using Mrtrix3 for my Diffusion MRI data. I wanted to preprocess the data with dwifslpreproc, but i received an error:
mrinfo: [WARNING] The following image volumes were not successfully assigned to a b-value shell:
mrinfo: [WARNING] 1 (800)
mrinfo: [WARNING] The following image volumes were not successfully assigned to a b-value shell:
mrinfo: [WARNING] 1 (800)
dwifslpreproc: [ERROR] Unhandled Python exception:
dwifslpreproc: [ERROR] AssertionError:
dwifslpreproc: [ERROR] Traceback:
dwifslpreproc: [ERROR] /home/micheles/mrtrix3/bin/dwifslpreproc:336 (in execute())
dwifslpreproc: [ERROR] assert all(index >= 0 for index in vol2shell)
For other data, where i have multiple diffusion gradient directions (from 6-30 directions) the preprocessing steps work, but in this case I worked with the diffusion mode “3D diagonal” (so the diagonal DWI method) where there is only one diffusion gradient direction. Is this the problem and how can i fix this?