Hi Michael,
Thanks a lot for your quick and detailed reply.
Just one more question: I had a look at the gm_roi.nii.gz in native_space folder. It seems to be somewhat sparse and discrete. wm_roi.nii.gz is better. I understand this is due to restricting to voxels with high probability of being GM. I was wondering if this would be a potential problem for segmenting CBF map into regions, especially into lobes and subcortical structures as you suggested to warp the ROI atlas to perfusion_calib which is masked by gm/wm_roi?
Kindest regards,
Jiyang
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