DWI scans distortion correction

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1

Greetings,

We have diffusion data which is currently in bds format and we would like to use QSIprep for preprocessing. From our understanding fmaps with phase encoding direction AP are used to correct PA dwi scans. Our question is, if we put AP and PA dwi scan in the IntendedFor field of the field map with AP phase encoding will it use and try to correct the AP dwi run with an AP fmap or it will do the distortion correction on the PA dwi run only?

Below is the IntendedFor of a field map with AP phase encoding
Dir

2

Hi @yabrham,

QSIPrep might throw an error if you match an AP fieldmap with an AP DWI scan. It would be best to fix your IntendedFor fields to be correct and do not assume the software will ignore the wrong direction scan. Also, dir-107AP/PA should just be dir-AP/PA.

Best,
Steven

3

Thank you @Steven, I added 107 in the baove because some scans we have are of 98,99 or 107 directions, I can remove the numbers.

4

Hi @yabrham,

You can add something like acq-98/99/107 do the filenames to distinguish between them.

Best,
Steven

5

Thank you @Steven , I will add the acq and that should do it.