In November 2006, Photon Imaging Inc was acquired by another small firm - Gamma Medica. Photon Imaging, Inc. had been a research and development company organized around research, development and commercialization of 'next generation' medical diagnostic instruments for advancing diagnosis and treatment of cancer. The firm also worked on advanced radiation measurement instrumentation for space and terrestrial scientific applications using the Companyâs imaging sensor technologies, Previously, in collaboration with Imetrx -- a firm working on catheter-based devices for locating and characterizing unstable coronary plaques -- Photon Imaging had developed intravascular devices to bioprofile atherosclerotic lesions.