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Journal of Biomedical Optics

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

Paper Details

Date Published: 1 July 2010
PDF: 10 pages
J. Biomed. Opt. 15(4) 046003 doi: 10.1117/1.3462930
Published in: Journal of Biomedical Optics Volume 15, Issue 4
Show Author Affiliations
Behnoosh Tavakoli, Univ. of Connecticut (United States)
Patrick Dzifanu Kumavor, Univ. of Connecticut (United States)
Andres Aguirre, Univ. of Connecticut (United States)
Quing Zhu, Univ. of Connecticut (United States)


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