title: Real-time full-field photoacoustic imaging using an ultrasonic camera.
abstract: A photoacoustic imaging system that incorporates a commercial ultrasonic camera for real-time imaging of two-dimensional (2-D) projection planes in tissue at video rate (30 Hz) is presented. The system uses a Q-switched frequency-doubled Nd:YAG pulsed laser for photoacoustic generation. The ultrasonic camera consists of a 2-D 12 x 12 mm CCD chip with 120 x 120 piezoelectric sensing elements used for detecting the photoacoustic pressure distribution radiated from the target. An ultrasonic lens system is placed in front of the chip to collect the incoming photoacoustic waves, providing the ability for focusing and imaging at different depths. Compared with other existing photoacoustic imaging techniques, the camera-based system is attractive because it is relatively inexpensive and compact, and it can be tailored for real-time clinical imaging applications. Experimental results detailing the real-time photoacoustic imaging of rubber strings and buried absorbing targets in chicken breast tissue are presented, and the spatial resolution of the system is quantified.
authors.affiliation: Northwestern University, Department of Mechanical Engineering, 2137 North Tech Drive, Evanston, Illinois 60208, USA.
authors.forename: Oluwaseyi
authors.initials: O
authors.lastname: Balogun
authors.forename: Brad
authors.initials: B
authors.lastname: Regez
authors.forename: Hao F
authors.initials: HF
authors.lastname: Zhang
authors.forename: Sridhar
authors.initials: S
authors.lastname: Krishnaswamy
mesh_terms: D003199:Computer Systems; D017076:Computer-Aided Design; D054459:Elasticity Imaging Techniques / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers