1Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China, People's Republic of, 2Healthcare Department, Philips Research China, Shanghai, China, People's Republic of, 3Philips Healthcare (Suzhou) Co., Ltd., Suzhou, China, People's Republic of, 4Department of Radiology, University of Washington, Seattle, WA, United States