TABLE I.

Overview of graph-based segmentation methods utilized for PET image segmentation.

Bagci et al. (Refs. 28 and 29)	Random-walk-based segmentation of lesions in PET images
Bagci et al. (Ref. 29)	Random-walk-based cosegmentation of PET and volumes produced with other imaging modalities
Ballangan et al. (Ref. 30)	Graph-cuts-based segmentation of lung cancer in PET images
Han et al. (Ref. 31) and Song et al. (Ref. 32)	Cosegmentation of single lesions in PET and CT images utilizing a Markov Random Field (MRF) approach; the optimization is solved using a graph-cuts-based method