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Dear SPMers,

I have used SPM realign to perform a realignment of a later image to an earlier image.  I would now 
like to perform an inverse realignment of a tracing performed on the earlier image (and converted to 
analyze format) into the space of the later image.  I was wondering how to manipulate the .mat file to 
get the inverse realignment?  I realize that I could just run realign again in the opposite direction, 
transfer the .mat data to the traced image using spm_vol and spm_write_vol, then perform 
spm_reslice, but figured there might be a less computationally intensive/time-saving way to 
calculate the .mat data than running spm_realign again in reverse.   Thanks for any help you may 
have to offer.

Lynne