HUAFENG LIU received his B.S. in Optical Engineering in 1995, M.S. in Measurement Techniques and Instruments in 1998, and Ph.D. in Positron Emission Tomography in 2001, all from the Department of Optical Engineering, Zhejiang University. From 2001 to 2003, he was a postdoctoral fellow at Hong Kong University of Science and Technology, working on statistical filtering and inverse mechanics strategies for cardiac image analysis and PET image reconstruction. He is currently a full professor at Zhejiang University. Dr. Liu is currently the director of the ZJU-HAMAMATSU Joint Photonics lab, which was cofounded by Hamamatsu Photonics K. K. and the Department of Optic-Electronic Information Engineering, Zhejiang University in 1995. Since then, his lab has focused on biomedical imaging instrumentation (PET), image reconstruction (PET, fMRI, ECG) and medical image analysis.