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Proceedings Paper

Detecting photoacoustic signals with a probing ultrasound beam
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Paper Abstract

A new method of measuring photoacoustic (PA) waves in situ is proposed. We make a probe ultrasonic beam to pass through the thick biotissue sample. Its focus point is used to tag the position of the PA signal overlapped by the PA interaction area in order to carry the PA information and take it out with the probe beam. When the detecting waves met the PA signal, a beating—wave is generated. Then it is received by a hydra-phone. After amplification and demodulation, a PA signal will be restored. In addition, the attenuation of PA signal in transmission could be decided by measuring the amplitude difference of probe ultrasound in front and behind the sample. It was helpful to simplify the reconstruction of the PA tomographic image and to increase SNR. The noise of the measurement system and background could be reduced when PA waveforms were discriminated. We measured the beating-wave produced by 532nm laser and 1 .4MHz probe ultrasonic beam in the thick biotissue and absorptive media, and reconstructed their PA signal waves with fine SNR.

Paper Details

Date Published: 12 September 2002
PDF: 7 pages
Proc. SPIE 4916, Optics in Health Care and Biomedical Optics: Diagnostics and Treatment, (12 September 2002); doi: 10.1117/12.482932
Show Author Affiliations
Yong Yao, South China Normal Univ. (China)
Da Xing, South China Normal Univ. (China)
Yaguang Zeng, South China Normal Univ. (China)

Published in SPIE Proceedings Vol. 4916:
Optics in Health Care and Biomedical Optics: Diagnostics and Treatment
Britton Chance; Mingzhe Chen; Gilwon Yoon, Editor(s)

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