Hi, I am currently working on a BIDS database and frequently checking the online validator. I recently encountered an issue with the volume detection in a diffusion acquistion: BIDS validator detected a missing volume compared to the bval-bvec files. I checked the volumes by opening them in Mango and indeed there seemed to be only the B0 volume. However when I opened the volume with ITK-SNAP, both B0 and B1000 were present. I also tried opening the file copy on a different drive in Mango and both volumes were identified. This lead me to wonder how NIfTI images with multivolumes were encoded, why some software identified the multi-channels while others didn't and why would it be different for one drive to the next?

I would be very grateful if you could shed some light on these questions!