首页> 外文会议>Conference on Biomedical Optoacoustics Ⅲ Jan 20-21, 2002 San Jose, USA >Optical properties of blood at various levels of oxygenation studied by time resolved detection of laser-induced pressure profiles
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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:通过时间分辨检测激光诱导的压力曲线研究了在不同充氧水平下血液的光学特性

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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:激光感应压力曲线的时间分辨检测可以对光学散射和不透明介质(例如血液)中吸收的光能分布进行灵敏和高分辨率的测量。我们报告了在不同水平的氧饱和度下动物全血中光学性质的实验测量,以及氧合和脱氧血红蛋白相对浓度的分析计算。结果表明,光声分布对血液光学特性的微小变化敏感。用绝对校准的声换能器在两个不同的激光波长757-nm和1064-nm上进行测量时,总血红蛋白浓度及其氧合水平可以从光声曲线中确定。还通过实验确定了通过激光照射产生的压力波的热声效率值。由于这些现象会影响激光照射后血液中光能的空间分布,因此研究了红细胞的沉降和聚集速率。从光声分布的动力学变化计算红细胞沉降速率。该结果鼓励了光声光谱技术在监测体外和人体组织血液特性方面的各种应用。

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