Research Papers: Imaging

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

[+] Author Affiliations
Behnoosh Tavakoli, Patrick D. Kumavor, Andres Aguirre, Quing Zhu

University of Connecticut, Department of Electrical and Computer Engineering, Storrs, Connecticut 06269

J. Biomed. Opt. 15(4), 046003 (July 20, 2010). doi:10.1117/1.3462930
History: Received November 23, 2009; Revised April 30, 2010; Accepted May 12, 2010; Published July 20, 2010; Online July 20, 2010
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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 750nm. 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.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Behnoosh Tavakoli ; Patrick D. Kumavor ; Andres Aguirre and Quing Zhu
"Effect of ultrasound transducer face reflectivity on the light fluence inside a turbid medium in photoacoustic imaging", J. Biomed. Opt. 15(4), 046003 (July 20, 2010). ; http://dx.doi.org/10.1117/1.3462930


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