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Proceedings Paper

Listening to light by fast photoacoustic tomography based on a digital phased array system
Author(s): Liangzhong Xiang; Da Xing; Diwu Yang; Sihua Yang; Guo Hua
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Paper Abstract

Photoacoustic imaging technique, which provided high ultrasonic resolution and high optical contrast tissue images, can overcome the disadvantages of pure optical imaging by measurement of laser-induced sound waves. The waves produced by tissue are high-frequency ultrasounds, meaning that they cannot be heard by human ear. However, it can be picked up with ultrasonic transducer and analyze them with a computer. The laser-induced ultrasonic signals from a biological sample can be used to reveal the tissues structure based on optical contrast. In current experiment system, an integrity multi-element synthetic aperture focusing (M-SAF) photoacoustic imaging system using real-time digital beamformer is developed. This system relies on pumping laser source to irradiate the biological tissue to produce photoacoustic signal, a linear ultrasonic transducer array is connected to a multichannel signal acquisition and real-time digital beam-formation system providing techniques of real-time dynamic receiving focus and dynamic receiving apodization to process the photoacoustic signal. Each element of the transducer array has a thin cylinder ultrasonic lens to select 2D image plane and suppress the out-of-plane signals to realize photoacoustic computed tomography. This method and system can provide a fast and reliable photoacoustic tomography approach that could be applied to noninvasive imaging and clinic diagnosis.

Paper Details

Date Published: 8 January 2008
PDF: 8 pages
Proc. SPIE 6826, Optics in Health Care and Biomedical Optics III, 68260E (8 January 2008); doi: 10.1117/12.760223
Show Author Affiliations
Liangzhong Xiang, South China Normal Univ. (China)
Da Xing, South China Normal Univ. (China)
Diwu Yang, South China Normal Univ. (China)
Sihua Yang, South China Normal Univ. (China)
Guo Hua, South China Normal Univ. (China)


Published in SPIE Proceedings Vol. 6826:
Optics in Health Care and Biomedical Optics III
Xingde Li; Qingming Luo; Ying Gu, Editor(s)

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