太赫兹计算层析成像研究进展(特邀)  

Research Progress of Terahertz Computational Tomography(Invited)

作　　者：戎路[1,2] 刘乂铭 宁冉 赵洁 王云新[1,2] 王大勇 Rong Lu;Liu Yiming;Ning Ran;Zhao Jie;Wang Yunxin;Wang Dayong(Department of Physics and Optoelectronics Engineering,Faculty of Science,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Center of Precision Measurement Technology and Instruments,Beijing 100124,China;College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518000,Guangdong,China;Shenzhen Key Lab of Micro-Nano Photonic Information Technology,Shenzhen 518000,Guangdong,China)

机构地区：[1]北京工业大学理学部物理与光电工程系,北京100124 [2]北京市精密测控技术与仪器工程技术研究中心,北京100124 [3]深圳大学物理与光电子工程学院,广东深圳518000 [4]深圳市微纳光子信息技术重点实验室,广东深圳518000

出　　处：《激光与光电子学进展》2024年第2期187-204,共18页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(62220106005,62175004,62075001);北京市自然科学基金(4222061,4222063)。

摘　　要：太赫兹波作为一种穿透性强、具有非电离性和惧水性的电磁波,可以穿透多种非金属、非极性介质材料。太赫兹计算层析成像技术基于傅里叶中心切片定理和直线传播模型,通过记录不同投影角度下的强度数据,采用滤波反投影等重建算法获得样品三维吸收系数分布和内外部结构信息分布。随着太赫兹成像器件的不断发展和应用场景的拓展,已发展出多种照明模式、成像光路和重建算法,并已在文物保护、骨密度测量和无损检测领域开展了应用探索。概述太赫兹计算层析技术的基本原理,并从提高重建质量、分辨率和采集效率三方面具体介绍太赫兹计算层析成像技术的最新研究。Terahertz waves possess remarkable penetrability,capable of passing through a wide range of non-metallic,nonpolar materials without causing ionization.This unique characteristic makes them particularly useful in the field of computed tomography,enabling the capture of detailed external and internal structures of samples along their threedimensional absorption coefficient distributions.In this process,the sinogram for each vertical layer is generated through raster scanning at different projection angles.These sinograms are then transformed into sectional images using filtered back projection and other algorithms based on the Fourier central slicing theorem.As the field has developed,a diverse array of illumination modes,imaging configurations,and reconstruction algorithms have been proposed.These advancements serve to accommodate the development of terahertz imaging instruments and components,as well as the expanding range of application scenarios.This study reviews the principals of terahertz computed tomography.We provide a comprehensive review of its recent research progress,focusing on enhancing three key areas:reconstruction quality,imaging resolution enhancement,and data acquisition efficiency.

关 键 词：太赫兹成像 计算层析 三维成像 照明光场调控 

分 类 号：TN29[电子电信—物理电子学]