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Optical properties of blood at various levels of oxygenation studied by time resolved detection of laser-induced pressure profiles

机译:通过定分辨率检测激光诱导的压力型材的各种氧合下血液的光学性质

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Time resolved detection of laser-induced pressure profiles permits sensitive and high-resolution measurements of distribution of absorbed optical energy in optically scattering and opaque media, such as blood. We report experimental measurements of optical properties in the whole blood of animals at various levels of oxygen saturation and analytical calculations of relative concentrations of oxy- and deoxy- hemoglobin. The results show that optoacoustic profiles are sensitive to small variations in optical properties of blood. When measured with absolutely calibrated acoustic transducers at two different laser wavelengths, 757-nm and 1064-nm, the total hemoglobin concentration and its oxygenation level can be determined from the optoacoustic profiles. The value of thermoacoustic efficiency of pressure wave generation by laser irradiation was also determined from experiments. Erythrocyte sedimentation and aggregation rate was studied, since these phenomena affect spatial distribution of optical energy in blood upon laser irradiation. Erythrocyte sedimentation rate was calculated from kinetic changes in optoacoustic profiles. The results encourage development of various applications of optoacoustic spectroscopy in monitoring of blood properties in vitro and in human tissues.
机译:激光诱导压力型材的时间分辨检测允许在光学散射和不透明培养基中的吸收光能分布的敏感和高分辨率测量,例如血液。我们在各种氧饱和度和分析计算的氧和脱氧 - 血红蛋白的相对浓度的分析计算中报告了各种血液中的光学性质的实验测量。结果表明,光声轮廓对血液光学性质的小变化敏感。当用两种不同的激光波长的绝对校准的声学换能器测量时,757-Nm和1064-nm,可以从光声型材确定总血红蛋白浓度及其氧合水平。通过实验,也确定了激光照射的压力波的热声效率的值。研究了红细胞沉降和聚集率,因为这些现象在激光照射时影响血液中光能的空间分布。从光声谱的动力学变化计算了红细胞沉积速率。结果促进了在体外和人组织中监测血液性质的各种应用的各种应用。

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