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首页> 外文会议>Conference on optical interactions with tissue and cells >Assessment of varying width illumination in hyperspectral push-broom system for scattering anisotropy measurements
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Assessment of varying width illumination in hyperspectral push-broom system for scattering anisotropy measurements

机译：评估高光谱推扫系统中变宽照明的散射各向异性测量

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摘要

Various illumination geometries are being used in push-broom hyperspectral systems (PB-HSI), where a specific choice of the geometry might affect the imaging results, especially when imaging turbid samples. In this study, the effect of the illumination line width on the reflected radiance is explored. Since the PB-HSI images a very narrow line on the sample, the hypothesis is that by varying the illumination line width tissue optical parameters can be assessed because of their effects on mean free transport path in the tissue. A numerical simulation of light propagation within tissue samples was performed by a 3D CUDA Monte Carlo (MC). A custom MC allowing various illumination geometries and different scattering phase functions was developed. Sets of realistic tissue optical properties, including different scattering phase functions, are used to simulate a bulk tissue. For each set of optical properties, reflectances are computed for illumination line widths varying between 0.1 to 20 mm in the 400-1000 nm spectral range. A prominent effect of the line width on the reflected fraction of photons in correlation with the optical properties was found. This study results demonstrated that the illumination geometry, namely the illumination line width, significantly affects the PB-HSI images of turbid samples. Thus, the geometry should be considered when performing the imaging and analyzing the obtained images. In addition, by varying the illumination line width during the imaging, scattering anisotropy of a sample and other optical properties could be assessed.
机译：推扫式高光谱系统（PB-HSI）中使用了各种照明几何形状，其中特定的几何形状选择可能会影响成像结果，尤其是在对浑浊的样品成像时。在这项研究中，探讨了照明线宽对反射辐射的影响。由于PB-HSI在样品上形成一条非常窄的线，因此假设是通过改变照明线宽度，可以评估组织的光学参数，因为它们对组织中平均自由运输路径的影响。通过3D CUDA蒙特卡洛（MC）对组织样本内的光传播进行了数值模拟。开发了允许多种照明几何形状和不同散射相位功能的定制MC。一组实际的组织光学特性（包括不同的散射相位函数）用于模拟体组织。对于每组光学特性，在400-1000 nm光谱范围内，计算照明线宽度在0.1到20 mm之间变化的反射率。发现线宽对光子的反射分数的显着影响与光学性质相关。该研究结果表明，照明几何形状，即照明线宽，显着影响混浊样品的PB-HSI图像。因此，在执行成像和分析获得的图像时应考虑几何形状。另外，通过在成像期间改变照明线的宽度，可以评估样品的散射各向异性和其他光学性质。

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