Figure 5

Reconstructed tomograms from the PET3 data set using three different reconstruction methods based on 30% sampling. The PET3 data set was acquired from a 70 year-old man with mild Alzheimer’s disease about 9 months prior to imaging. As with the reconstructed tomograms from the PET1 and PET2 data sets, it can be observed that the FBP method results in the most significant artifacts in both the background and imaged brain areas when compared to TVR and HNLR. The TVR method results in reduced artifacts but noticeable loss in functional variation differences in the imaged brain area, and the HNLR method results in the least amount of artifacts and better preservation of functional variation differences in the imaged brain area.