基于特拉赫兹计算断层扫描的一般化平面波谱的倒置方法
Tianqi Feng1, Chengyong Yu2, Yu Shi1
1School of Integrated Circuit Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
The Review of scientific instruments
|March 11, 2026
概括
这项研究引入了一种新的太赫兹计算断层扫描 (THz-CT) 倒置方法,该方法可以解释角散射. 该方法提高了各种材料的重建精度,提高了非破坏性测试能力.
科学领域:
- 物理 物理学 物理
- 电磁学 电磁学 电磁学 电磁学
- 影像科学 影像科学
背景情况:
- 来自X射线CT的太赫兹计算断层扫描 (THz-CT) 方法通常使用变换并假定直线传播.
- 这些传统方法忽略了太赫兹波散射现象,如折射和角散射,导致重建不准确.
- 现有的研究往往忽略了角散射对THz-CT性能的影响.
研究的目的:
- 提出一种新的THz-CT反转方法,该方法包含角散射特征.
- 为了解决理论平面波假设和实验高斯波束条件之间的差异.
- 为了验证不同材料类型的拟议方法的准确性和可行性.
主要方法:
- 基于一般化的平面波谱的倒置算法的开发,以模拟分层结构中的角散射.
- 引入一个场校正,使理论平面波分析与实验高斯波束条件相协调.
- 使用定制的角散射现场测试系统进行实验验证,并与有序子集预期最大化 (OSEM) 方法进行比较.
主要成果:
- 拟议的反转方法准确地重建了太赫兹计算机断层扫描数据,并考虑了角散射.
- 与OSEM的实验比较表明,拟议方法的精度更高.
- 该方法在PEC (完美电导体) 样品中显示出高精度,并且在介电材料中显示出可行性.
结论:
- 开发的反转方法有效地处理THz-CT中的角散射,提高重建质量.
- 场校正成功地弥合了理论模型和实验设置之间的差距.
- 这种技术提供了一种更准确和更通用的方法,用于使用THz-CT进行非破坏性测试,适用于导电和介电材料.
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