Hi Mark,
Sorry about the confusion again.
I am multiplying my ROI (which is grey matter) by sienax pve_1 mask. The aim was to make the ROI fit within the grey matter region as much as possible.
So, I thresholded and binarized pve_1 and multipled by my grey matter ROI then transferred it to DTI space.
I hope this is clearer. Would you recommend this approach?
Thanks.
Best,
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