A three-dimensional registration method for automated fusion of micro PET-CT-SPECT whole-body images. - Meei-Ling Jan; Keh-Shih Chuang; Guo-Wei Chen; Yu-Ching Ni; Sharon C. Chen; Chih-Hsien Chang; Jay Wu; Te-Wei Lee; Ying-Kai Fu (IEEE Trans. Medical Imaging, 2005)