Effect of ultrasound transducer face reflectivity on the light fluence inside a turbid medium in photoacoustic imaging
Effect of ultrasound transducer face reflectivity on the light fluence inside a turbid medium in photoacoustic imaging
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DOI：
10.1117/1.3462930
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发表时间：
2010-07-01
影响因子：
3.5
通讯作者：
Zhu, Quing
中科院分区：
文献类型：
--
作者：
Tavakoli, Behnoosh;Kumavor, Patrick D.;Zhu, Quing
许多内窥镜、血管内和经阴道应用需要光以反射模式通过光纤传送。对于反射几何结构中的光声成像，超声换能器面的正面反射率施加了影响光通量及其在混浊介质内的分布的边界条件。理解和表征该边界条件对于最大化组织照明以及因此最大化光声信号的信噪比是至关重要的。我们系统地分析了三个典型的商业换能器面临的反射系数为1.4，18，和28%下的光通量，并比较结果的换能器面对60%的系数在750 nm的激光波长。Monte Carlo模拟和实验结果表明，光通量和分布内的混浊介质中使用的60%的反射系数换能器面对有一个显着的改善，特别是在较浅的深度。(C)2010年，美国光学仪器工程师学会（Society of Photo-Optical Instrumentation Engineers）[DOI 10.1117/1.3462930]
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. (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3462930]