Dear MRtrix Community,
First of all, thanks to the developers for providing such a powerful tool and maintaining it so well. It helps me a lot in learning dMRI processing.
I got a dataset where the b values are unstable; specifically, the b=0 turns out to be b=15 mm/s2. And when I was running dwinormalise, I got the error
dwiextract: [ERROR] No b=0 volumes present
mrmath: [ERROR] no filename supplied to standard input (broken pipe?)
mrmath: [ERROR] error opening image “-”
mrstats: [ERROR] no filename supplied to standard input (broken pipe?)
mrstats: [ERROR] error opening image “-”
Therefore, I’m wondering:
- For a temporary solution, can I modify my bval file so that all of my b=15 are converted to b=0?
- Could we implement a feature in which we tolerate a certain extent of b-value fluctuation? This would be especially helpful for data in 7T.
Thanks!
Best regards,
Ziqi