论文标题
香蕉的深度和脉冲条带照明弥漫光学断层扫描
The depth of the banana and the impulse stripe illumination for diffuse optical tomography
论文作者
论文摘要
条纹照明位于空间频率域中的照明与点照明之间。尽管条纹照明具有周期性的结构，因为在空间频率域中的照明，带有条带照明的光可以到达生物组织中的深区域，因为它可以被视为点照明阵列。对于一对源和检测器，连接源和检测器的光路的形状称为香蕉形。首先，我们研究香蕉的深度。在零边界条件的情况下，我们发现香蕉中心的深度约为$ 0.2D _ {\ rm sd} $对于典型的光学参数，其中$ d _ {\ rm sd} $是边界上源和检测器之间的距离。通常，深度取决于吸收和扩散系数以及边界上折射率的比率。接下来，我们对蒙特卡洛模拟采集的正向数据进行弥漫性光学断层扫描。我们考虑对条纹形状的冲动照明。到这个时间分辨的测量值，重建了目标的吸收系数。
The stripe illumination lies between the illumination in the spatial-frequency domain and the point illumination. Although the stripe illumination has a periodic structure as the illumination in the spatial-frequency domain, light from the stripe illumination can reach deep regions in biological tissue since it can be regarded as an array of point illuminations. For a pair of a source and a detector, the shape of light paths which connect the source and detector is called the banana shape. First, we investigate the depth of the banana. In the case of the zero boundary condition, we found that the depth of the center of the banana is about $0.2d_{\rm SD}$ for typical optical parameters, where $d_{\rm SD}$ is the distance between the source and detector on the boundary. In general, the depth depends on the absorption and diffusion coefficients, and the ratio of refractive indices on the boundary. Next, we perform diffuse optical tomography for the stripe illumination against forward data taken by Monte Carlo simulation. We consider an impulse illumination of the shape of a stripe. By this time-resolved measurement, the absorption coefficient of a target is reconstructed.
