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

Source: J. Biomed. Opt. 15, 046003 (2010); doi:10.1117/1.3462930

Published 20 July 2010

KEYWORDS and PACS
Keywords
PACS
  • 87.63.L-
    Visual medical imaging
  • 43.80.Qf
    Medical diagnosis with acoustics
  • 87.10.Rt
    Monte Carlo simulations (biological/medical physics)
  • 43.35.Ud
    Thermoacoustics, high temperature acoustics, photoacoustic effect
  • 87.63.D-
    Ultrasonography in medicine
  • YEAR: 2010
PUBLICATION DATA
ISSN:
1553-9628 (online)
Publisher:
AIP is a member of CrossRef SPIE
Behnoosh Tavakoli, Patrick D. Kumavor, Andres Aguirre, and Quing Zhu
University of Connecticut, Department of Electrical and Computer Engineering, Storrs, Connecticut 06269
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
History: Received 23 November 2009; revised 30 April 2010; accepted 12 May 2010; published 20 July 2010
Permalink: http://dx.doi.org/10.1117/1.3462930

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