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Imaging and sensing based on dual-pulse nonlinear photoacoustic contrast: a preliminary study on fatty liver

机译:基于双脉冲非线性光声对比的成像和传感:脂肪肝的初步研究

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摘要

The feasibility of diagnostic imaging and tissue characterization based on a new contrast realized by dual-pulse photoacoustic measurement was studied. Unlike current photoacoustic methods which are mostly focused on the measurement of tissue optical absorption, this contrast revealed by a dual-pulse laser excitation process takes advantage of the temperature dependence of the Gruneisen parameter of tissue. The first laser pulse heats the sample and causes a temperature rise in the target tissue, which leads to a change of the Gruneisen parameter and the amplitude of the photoacoustic signal from the second laser pulse. This new contrast is then quantified by percentile change in the second pulse signal as a result of the first laser pulse. Since the temperature-dependent Gruneisen parameter is tissue specific and closely relevant to chemical and molecular properties of the sample, the dual-pulse photoacoustic measurement can differentiate various tissue types and conditions. The preliminary study on phantoms and a mouse model has suggested the capability of the proposed contrast in the characterization of fatty livers and the potential for future clinical diagnosis of liver conditions. (C) 2015 Optical Society of America
机译:研究了基于双脉冲光声测量实现的新对比度诊断成像和组织表征的可行性。与当前主要专注于组织光学吸收测量的光声方法不同,双脉冲激光激发过程揭示的这种对比利用了组织的Gruneisen参数的温度依赖性。第一激光脉冲加热样品并导致目标组织的温度升高,这导致Gruneisen参数的变化以及来自第二激光脉冲的光声信号的幅度发生变化。然后通过作为第一激光脉冲的第二脉冲信号中的百分比变化来量化这种新的对比度。由于温度相关的Gruneisen参数是组织特异性的,并且与样品的化学和分子特性密切相关,因此双脉冲光声测量可以区分各种组织类型和条件。对体模和小鼠模型的初步研究表明,所提出的对比剂具有表征脂肪肝的能力,并有可能在将来对肝病进行临床诊断。 (C)2015年美国眼镜学会

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