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Retooling Laser Speckle Contrast Analysis Algorithm to Enhance Non-Invasive High Resolution Laser Speckle Functional Imaging of Cutaneous Microcirculation

机译:重新设计激光斑点对比分析算法增强皮肤微循环的非侵入性高分辨率激光斑点功能成像

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摘要

Cutaneous microvasculopathy complicates wound healing. Functional assessment of gated individual dermal microvessels is therefore of outstanding interest. Functional performance of laser speckle contrast imaging (LSCI) systems is compromised by motion artefacts. To address such weakness, post-processing of stacked images is reported. We report the first post-processing of binary raw data from a high-resolution LSCI camera. Sharp images of low-flowing microvessels were enabled by introducing inverse variance in conjunction with speckle contrast in Matlab-based program code. Extended moving window averaging enhanced signal-to-noise ratio. Functional quantitative study of blood flow kinetics was performed on single gated microvessels using a free hand tool. Based on detection of flow in low-flow microvessels, a new sharp contrast image was derived. Thus, this work presents the first distinct image with quantitative microperfusion data from gated human foot microvasculature. This versatile platform is applicable to study a wide range of tissue systems including fine vascular network in murine brain without craniotomy as well as that in the murine dorsal skin. Importantly, the algorithm reported herein is hardware agnostic and is capable of post-processing binary raw data from any camera source to improve the sensitivity of functional flow data above and beyond standard limits of the optical system.
机译:皮肤微血管病变使伤口愈合复杂化。因此,对门控的单个真皮微血管的功能评估非常重要。运动伪影会损害激光散斑对比度成像(LSCI)系统的功能性能。为了解决这种弱点,报道了堆叠图像的后处理。我们报告了高分辨率LSCI相机对二进制原始数据的首次后处理。通过在基于Matlab的程序代码中引入反方差以及斑点对比度,可以实现低流量微血管的清晰图像。扩展的移动窗口平均增强了信噪比。使用徒手工具在单门微血管上进行了血流动力学的功能性定量研究。基于低流量微血管中的流量检测,得出了新的清晰对比图像。因此,这项工作提出了带有门控人足微脉管系统定量微灌注数据的第一个独特图像。这个多功能平台可用于研究广泛的组织系统,包括无需开颅的鼠脑以及鼠背皮肤中的精细血管网络。重要的是,本文报告的算法与硬件无关,并且能够对来自任何相机源的二进制原始数据进行后处理,以提高功能流数据的灵敏度,使其超出光学系统的标准范围。

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