Fig. 4.

(a): Original MR brain image. (b): Segmentation of (a) into four tissue types. (c): Anatomical boundaries extracted from (b). (d): Computed PET phantom generated from MR template (b). (e): PET reconstruction using filtered backprojection. (f): PET reconstruction using maximum likelihood estimation. (g): PET reconstruction using a simple quaratic MRF model. (h): PET reconstruction using a compound MRF model without anatomical prior (i): PET reconstruction using compound MRI with anatomical prior. Reprinted with permission.54