Image segmentation and activity estimation for microPET 11C-raclopride images using an expectation-maximum algorithm with a mixture of Poisson distributions. - Kuan-Hao Su; Jay S. Chen; Jih-Shian Lee; Chi-Min Hu; Chi-Wei Chang; Yuan-Hwa Chou; Ren-Shyan Liu; Jyh-Cheng Chen (Comput. Medical Imaging Graph., 2011)