A CTRW-based model of time-resolved fluorescence lifetime imaging in a turbid medium.

A CTRW-based model of time-resolved fluorescence lifetime imaging in a turbid medium.
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DOI:
10.1016/j.optcom.2010.06.099
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发表时间:
2010-12-01
影响因子:
2.4
通讯作者:
Weiss, George H.
Weiss, George H.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Chernomordik, Victor;Gandjbakhche, Amir H.;Hassan, Moinuddin;Pajevic, Sinisa;Weiss, George H.

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我们开发了一个分析模型的时间分辨的荧光成像的光子迁移通过一个半无限的混浊介质中嵌入在介质中的一个单一的固定点的荧光团的存在下,由一个无限的平面。与早期的荧光成像模型相比,其中光子运动被假设为某种形式的连续扩散过程,本分析是基于简单立方晶格上的连续时间随机游走(CTRW),其目标是估计荧光团的位置和寿命。这样的信息可以提供与具有潜在医学意义的pH和温度的局部变化相关的信息。使用时间分辨测量的荧光从组织样幻影内的小夹杂物的理论方面进行了测试。实验结果被认为是在良好的协议与理论预测提供的荧光团是不是位于太接近的平面边界,在许多扩散系统中的一个常见问题。
We develop an analytic model of time-resolved fluorescent imaging of photons migrating through a semi-infinite turbid medium bounded by an infinite plane in the presence of a single stationary point fluorophore embedded in the medium. In contrast to earlier models of fluorescent imaging in which photon motion is assumed to be some form of continuous diffusion process, the present analysis is based on a continuous-time random walk (CTRW) on a simple cubic lattice, the object being to estimate the position and lifetime of the fluorophore. Such information can provide information related to local variations in pH and temperature with potential medical significance. Aspects of the theory were tested using time-resolved measurements of the fluorescence from small inclusions inside tissue-like phantoms. The experimental results were found to be in good agreement with theoretical predictions provided that the fluorophore was not located too close to the planar boundary, a common problem in many diffusive systems.
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期刊: APPLIED OPTICS
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