Dear SPM mailing list,
I want to use the "realign & unwarp" option in SPM8. Unfortunately, for a subset of 10 subjects only the phase difference image but not the magnitude image of the field mapping was saved (Siemens gre_filemapping sequence, 3T VERIO). I was told that the magnitude image is actually not used to create the vdm.file (that is then used for the "realign & unwarp" function in SPM). However, using the FielMap toolbox of SPM8 (to calculate the vdm.file) requires that a magnitude image is entered.
Is there any chance to create the vdm.file without the magnitude image of the field mapping sequence?
Best,
Anita
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