Dear Jesper,
I uploaded 9 files: 1) dcm2nii converted two original NIFTI images (Head to Foot: b0_ID_HF and Foot to Head: b0_ID_FH), 2) two fslswapdim x -z y swapped images (Rb0_ID_HF and Rb0_ID_FH), 3) merged two swap images to one Rb0_ID_2b0 image, 4) four output images unwarped_Rb0
topup --imain=Rb0_2b0.nii.gz --datain=acqparams.txt --config=${FSLDIR}/etc/flirtsch/b02b0.cnf
--out=topup_Rb0 --fout=field_Rb0 --iout=unwarped_Rb0
acqparams.txt
0 -1 0 1
0 1 0 1
Thank you so very much in advance. I look forward to your reply!
Best Wishes
Joyce
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