Hi,
I have a time series of fMRI data and I need to subtract the even
numbered images from the odd numbered images ( like PET except Ive got
fMRI images). Does anyoen know if I can perform these subtractions on
SPM ? There is a calculator button in SPM where one can add or
subtract images using an expression. However I have around 170 scans
and performing the subtractions one by one in pairs would be time
consuming and take forever. Can I produce a difference time series all
in one go ( even some code which works under SPM would be great )?
Alternatively could I just use the PET module and input all my scans ?
Woudl the subtractions be perfomed automatically and how woudl I
create the design matrix ?
Secondly , does anyone know how to calculate % signal changes in SPM ?
I desperately need some help with this . I woudl be extremely
grateful if anyone could help me
Cheers
Ben
|