1. School of Electronic and Information Engineering; Beijing Jiaotong University; Beijing China
2. Department of Radiology; University of Chicago; Chicago Illinois USA
3. Department of Radiology; University of North Carolina; Chapel Hill North Carolina USA
4. Molecular Imaging Program; National Cancer Institute; National Institutes of Health; Bethesda Maryland USA
5. Urologic Oncology Branch; National Cancer Institute; National Institutes of Health; Bethesda Maryland USA
6. Department of Pathology; University of Chicago; Illinois USA
7. Diagnostic Radiology Department; National Institutes of Health; Bethesda Maryland USA