Early-photon fluorescence tomography: spatial resolution improvements and noise stability considerations.

Early-photon fluorescence tomography: spatial resolution improvements and noise stability considerations.
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DOI:
10.1364/josaa.26.001444
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发表时间:
2009-06
期刊:
Journal of the Optical Society of America. A, Optics, image science, and vision
影响因子:
--
通讯作者:
Pogue BW
Pogue BW
中科院分区:
其他
文献类型:
--
作者:
Leblond F;Dehghani H;Kepshire D;Pogue BW

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使用近红外光的体内组织成像由于高度散射的光子传输而遭受低空间分辨率和差的对比度恢复。对于扩散光学断层扫描(DOT)和荧光分子断层扫描(FMT),分辨率被限制在被成像组织直径的约5-10%,这使其处于核医学中所见的性能范围内。本文介绍的数学形式主义解释为什么FMT的分辨率可以显着提高时,使用仪器采集快速时域光信号。这是通过基于弱扩散光子的时间门控逆问题的奇异值分析来实现的。与小鼠成像相关的模拟显示,与稳态成像形成鲜明对比的是,早期时间门控强度(在200 ps或400 ps内)原则上可用于分辨间隔小于1.5 mm的小荧光靶(半径从1.5 mm至2.5 mm)。
In vivo tissue imaging using near-infrared light suffers from low spatial resolution and poor contrast recovery because of highly scattered photon transport. For diffuse optical tomography (DOT) and fluorescence molecular tomography (FMT), the resolution is limited to about 5–10% of the diameter of the tissue being imaged, which puts it in the range of performance seen in nuclear medicine. This paper introduces the mathematical formalism explaining why the resolution of FMT can be significantly improved when using instruments acquiring fast time-domain optical signals. This is achieved through singular-value analysis of the time-gated inverse problem based on weakly diffused photons. Simulations relevant to mouse imaging are presented showing that, in stark contrast to steady-state imaging, early time-gated intensities (within 200 ps or 400 ps) can in principle be used to resolve small fluorescent targets (radii from 1.5 to 2.5 mm) separated by less than 1.5 mm.
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