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Modeling of nonphase mechanisms in ultrasonic modulation of light propagation

机译:超声调制光传播中的非相位机制建模

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摘要

While phase variation due to ultrasonic modulation of coherent light has been extensively studied in acous-to-optical imaging, fewer groups have studied nonphase mechanisms of ultrasonic modulation, which may be important in exploring ultrasonic modulation of incoherent light for imaging. We have developed a versatile Monte Carlo based method that can model not only phase variation due to refractive index changes and scatterer displacement in tissue or tissue-like phantoms, but also amplitude and exit location variations due to the changes in optical properties and refractive index under ultrasonic modulation, in which the exit location variation has not, to the best of our knowledge, been modeled previously. Our results show that the modulation depth due to the exit location variation is three orders of magnitude higher than that due to amplitude variation, but two to three orders of magnitude lower than that due to phase variation for monochromatic light. Furthermore it is found that the modulation depth in reflectance due to the exit location variation is larger than that in transmittance for small source-detector separations.
机译:尽管在声光成像中已经广泛研究了相干光的超声调制引起的相位变化,但是研究超声调制的非相位机制的研究小组却很少,这对探索成像用非相干光的超声调制可能很重要。我们已经开发了一种通用的基于蒙特卡洛的方法,该方法不仅可以模拟由于折射率变化和组织或类组织体模中的散射体位移引起的相位变化,而且可以模拟由于光学特性和折射率变化引起的振幅和出射位置变化。据我们所知,以前没有对出口位置变化进行超声调制的模型。我们的结果表明,出射位置变化引起的调制深度比幅度变化引起的调制深度高三个数量级,但由于单色光的相位变化引起的调制深度比其低两到三个数量级。此外,发现由于出射位置变化而引起的反射率的调制深度大于对于小的源-探测器间隔的透射率的调制深度。

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