Human Prostate Imaging Using a Novel Integrated Transrectal Ultrasound and Photoacoustic Instrument - Sri Rajasekhar Kothapalli; Jung Woo Choe; Anshuman Bhuyan; Lee, Byung Chul; Te-Jen Ma; Amin Nikoozadeh; Jonathan Wu; Daniel Bui; Joseph C. Liao; James Brooks; Butrus T. Khuri-Yakub; Sanjiv S. Gambhir