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. 2022 Mar 8;14:40. doi: 10.1186/s13195-022-00981-1

Fig. 2.

Fig. 2

Region of interest (ROI) definition to measure the changes in PET amyloid levels in gray matter targeted by the implant (ROI1) as compared to similar tissue in the opposite (ROI2) and same hemispheres (ROI3)