Fundamental study on diffusing light topography

漫射光形貌的基础研究

• 批准号: 10650396
• 负责人: IWAI Toshiaki
• 金额: $ 2.24万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650396/
• 关键词: Diffusing light topogaphy; Multiple backscattering; Monte Carlo simulation; Photon diffusion theory; Optical path-length distribution; Optical CT; Visualization of blood vessel; Deconvolution; 拡散光; トポグラフィ; 血管造影

The purpose of the research project is to establish a diffusing light topography in a surface profiling of an absorber embedded in a strongly scattering medium. The relation between a backscattered intensity distribution and an optical path-length distribution was first studied by means of Monte Carlo simulations. The fairly well images for a slab-plane, stir-like, and modified-pyramidal absorbers were reconstructed in experiments and simulations and, therefore, the availability of the proposed method was confirmed. The deconvolution method was introduced to the formation of the backscattered intensity distribution at the boundary to improve the quality of the blurred image. A portion of the edge in the blurred image was sharpened by using the point spread function estimated by the Monte Carlo simulation for the point-like absorber placed at the shallowest depth. Finally, the optical path-length distribution was derived theoretically from a photon diffusion equation. The new relation between the depth of the absorber and the maximum path-length was obtained, by which the image was reconstructed with the same accuracy as the simulation. Throughout this research project, we are convinced that the proposed diffusing light topography leads us to the visualization of the blood vessel map and the tumor under the skin.

研究项目的目的是在嵌入在强散射培养基中的吸收器的表面分析中建立一个扩散的光线图。首先通过蒙特卡洛模拟研究了反向散射强度分布与光路长分布之间的关系。在实验和仿真中重建了平面，搅拌和改良的pyramidal吸收器的相当良好的图像，因此确认了所提出的方法的可用性。将反卷积方法引入了边界处的反向散射强度分布的形成，以提高模糊图像的质量。通过使用由蒙特卡洛模拟估计的点扩散函数来锐化图像中的边缘的一部分，用于放置在最浅的深度处的点样吸收器。最后，理论上从光子扩散方程中得出了光路径长度分布。获得了吸收器深度与最大路径长度之间的新关系，通过该关系与模拟相同的精度重建图像。在整个研究项目中，我们深信，提出的扩散光线形态使我们能够可视化血管图和皮肤下的肿瘤。

项目成果

K.Ishii: "Optical free-path-length distribution function in a farctal aggregate and its effect on enhanced backscttering"Applid Optics. 37(21). 5014-5018 (1998)

K.Ishii：“分光聚合中的光学自由程长度分布函数及其对增强后向散射的影响”Applid Optics。

T.Iwai: "Coherent backscattering of light from a polydisperse random medium as a model of fractal aggregations of particls"Proceedings of SPIE. 3252. 90-98 (1998)

T.Iwai：“来自多分散随机介质的光的相干反向散射作为粒子分形聚集的模型”SPIE 会议录。

G. Kimura and T. Iwai: "Profiling of an absorbent embedded in strong scattering media using a diffuse wave reflectometry"Proceedings of Optics Japan '98. 247-248 (1998)

G. Kimura 和 T. Iwai：“使用漫波反射计对嵌入强散射介质中的吸收剂进行分析”Proceedings of Optics Japan 98。

T. Iwai, Y. Aizu, and T. Asakura: "Fundamentals of laser measurements II : Scatterometry"The Review of Laser Engineering. 27-9. 642-651 (1999)

T. Iwai、Y. Aizu 和 T. Asakura：“激光测量基础 II：散射测量”激光工程评论。

T.Iwai: "Depth estimation of an absorbent embedded in a dense medium using diffused wave reflextometry" Abstract of 5th International Conference and Euroconference OWLSV "Biomdedicine and Culture in the Era of Modern Optics and Lasers". ThB06-ThB06 (1998)

T.Iwai：“使用扩散波反射测量法对嵌入致密介质中的吸收剂进行深度估计”第五届国际会议和欧洲会议 OWLSV“现代光学和激光时代的生物医学与文化”摘要。