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Visible, hyperspectral imaging evaluating the cutaneous response to ultraviolet radiation

机译:可见的高光谱成像评估皮肤对紫外线的反应

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In vivo diagnostics of skin diseases as well as understanding of the skin biology constitute a field demanding characterization of physiological and anatomical parameters. Biomedical optics has been successfully used to qualitatively and quantitatively estimate the microcirculatory conditions of superficial skin. Capillaroscopy, laser Doppler techniques and spectroscopy, all elucidate different aspects of microcirculation, e.g. capillary anatomy and distribution, tissue perfusion and hemoglobin oxygenation. We demonstrate the use of a diffuse reflectance hyperspectral imaging system for spatial and temporal characterization of tissue oxygenation, important to skin viability. The system comprises: light source, liquid crystal tunable filter, camera objective, CCD camera, and the decomposition of the spectral signature into relative amounts of oxy- and deoxygenized hemoglobin as well as melanin in every pixel resulting in tissue chromophore images. To validate the system, we used a phototesting model, creating a graded inflammatory response of a known geometry, in order to evaluate the ability to register spatially resolved reflectance spectra. The obtained results demonstrate the possibility to describe the UV inflammatory response by calculating the change in tissue oxygen level, intimately connected to a tissue's metabolism. Preliminary results on the estimation of melanin content are also presented.
机译:皮肤疾病的体内诊断以及对皮肤生物学的理解构成了要求表征生理和解剖学参数的领域。生物医学光学已成功用于定性和定量评估浅表皮肤的微循环状况。毛细管镜检查,激光多普勒技术和光谱学都阐明了微循环的不同方面,例如毛细血管解剖和分布,组织灌注和血红蛋白充氧。我们演示了使用扩散反射高光谱成像系统对组织氧合的时空特征,对皮肤的生存能力很重要。该系统包括:光源,液晶可调滤光片,相机物镜,CCD相机,并将光谱特征分解为每个像素中的相对数量的含氧和脱氧血红蛋白以及黑色素,从而产生组织发色团图像。为了验证该系统,我们使用了一个光测试模型,创建了已知几何形状的分级炎症反应,以便评估记录空间分辨反射光谱的能力。获得的结果表明,可以通过计算与组织代谢密切相关的组织氧水平的变化来描述紫外线的炎症反应。还介绍了估计黑色素含量的初步结果。

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