Dear Freesurfer experts, I want to derive registration matrix between pcasl image and the structural space in Freesurfer (i.e. orig.mgz) If I open orig.mgz and the pcasl image in Freesurefr I see overlap between the images (attached Figure1). When I use "spmregister" as follow: spmregister --mov perfusion_calib.nii.gz --s SUBJ --reg reg.dat --fsvol orig --o CBF_T1.nii Then visualize "CBF_T1" using freeview I see mis-registration (attached Figure2) Please what I am doing wrong? Thank you for any guidance Jon