Deep Tissue Photoacoustic Imaging Using a Miniaturized 2-D Capacitive Micromachined Ultrasonic Transducer Array. - Sri-Rajasekhar Kothapalli; Te-Jen Ma; Srikant Vaithilingam; Ömer Oralkan; Butrus T. Khuri-Yakub; Sanjiv Sam Gambhir (IEEE Trans. Biomed. Eng., 2012)