Effect of ultrasound transducer face reflectivity on the light fluence inside a turbid medium in photoacoustic imaging

Behnoosh Tavakoli; Patrick Dzifanu Kumavor; Andres Aguirre; Quing Zhu

doi:10.1117/1.3462930

1 July 2010 Effect of ultrasound transducer face reflectivity on the light fluence inside a turbid medium in photoacoustic imaging

Behnoosh Tavakoli, Patrick Dzifanu Kumavor, Andres Aguirre, Quing Zhu

Author Affiliations +

Journal of Biomedical Optics, Vol. 15, Issue 4, 046003 (July 2010). https://doi.org/10.1117/1.3462930

Abstract

Many endoscopic, intravascular, and transvaginal applications require light to be delivered through optical fibers in a reflection mode. For photoacoustic imaging in reflection geometry, the front-face reflectivity of the ultrasound transducer face imposes a boundary condition that affects the light fluence and its distribution inside a turbid medium. Understanding and characterizing this boundary condition is critical for maximizing tissue illumination and therefore the signal-to-noise ratio of the photoacoustic signal. We systematically analyze the light fluence under three typical commercial transducer faces having reflection coefficients of 1.4, 18, and 28%, and compare the results to a transducer face with 60% coefficient at the laser wavelength of 750 nm. Monte Carlo simulations and experimental results show that light fluence and distribution obtained inside a turbid medium with the use of the 60% reflection coefficient transducer face has a significant improvement over the others, especially at shallower depths.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Behnoosh Tavakoli, Patrick Dzifanu Kumavor, Andres Aguirre, and Quing Zhu "Effect of ultrasound transducer face reflectivity on the light fluence inside a turbid medium in photoacoustic imaging," Journal of Biomedical Optics 15(4), 046003 (1 July 2010). https://doi.org/10.1117/1.3462930

Published: 1 July 2010

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