Hello
My question is as follows:
Is it necessary to process the phase difference image from SIEMENS scanners before usage in the fsl_prepare_fieldmap command?
I have an older analysis guide I have inherited from my supervisor, where there is a processing step on the phase difference image before usage in the fsl_prepare_fieldmap command.
It is as follows: fslmaths *_FM_phase.nii -add 4096 -mul .5 *_FM_phase_sc.nii
(*=my subjects ID)
And the *_FM_phase_sc.nii is used as input in the fsl_prepare_fieldmap command.
I have tried both with and without this processing step, and it is not obvious to me what is correct. I have not been able to find the answer on the Wiki or in the FSL course practical material.
Thanks in advance!
Iselin Meluken
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MD, PhD student
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