Photoacoustic imaging using a frequency domain synthetic aperture focusing technique

S. Boonsang; J. Zainal; Richard J. Dewhurst

doi:10.1117/12.572040

29 July 2004 Photoacoustic imaging using a frequency domain synthetic aperture focusing technique

S. Boonsang, J. Zainal, Richard J. Dewhurst

Proceedings Volume 5486, ALT'03 International Conference on Advanced Laser Technologies: Biomedical Optics; (2004) https://doi.org/10.1117/12.572040
Event: ALT'03 International Conference on Advanced Laser Technologies: Biomedical Optics, 2003, Silsoe, United Kingdom

Abstract

This paper describes the application of a frequency domain synthetic aperture focusing technique to photoacoustic imaging. The photoacoustic probe consisted of a laser delivery fiber-optic (diameter of 600 μm, plastic coated silica) combined with a polymer (PVDF) transducer for ultrasonic detection. This system had a broadband frequency response in the MHz region. Such an integral probe was designed to optically transmit and receive near on-axis ultrasonic transients simultaneously, in under water applications. A frequency domain synthetic aperture method was successfully applied using phantom samples to produce 2D images from A-scan signals received from the probe. A range of samples were examined, including black nylon with 1 mm circular holes at a depth of 5.9 mm from the surface. A comparison was made with conventional B-scan images and with time domain synthetic aperture images. Results showed that synthetic focusing apertures, in time or frequency domains, offer better signal-to-noise ratios with improved capabilities in lateral resolution.

Citation Download Citation

S. Boonsang, J. Zainal, and Richard J. Dewhurst "Photoacoustic imaging using a frequency domain synthetic aperture focusing technique", Proc. SPIE 5486, ALT'03 International Conference on Advanced Laser Technologies: Biomedical Optics, (29 July 2004); https://doi.org/10.1117/12.572040

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