San Diego-based Naviscan, the developer of 3D medical imaging technology, said today that it has added Andre Cheng, M.D., Ph.D., to its board of directors. Cheng has previously served as VP of Medical Affairs and Reimbursement at Acclarent, in addition to serving at Ethicon and The Advisory Board Company. Naviscan develops compact, high-resolution PET scanners used in surgery. The firm is venture backed by Mayo Medical Ventures, QuestMark Partners, Sanderling Ventures, and Walker Ventures.