脉冲辐射源超快动态成像的五视角三维重建

IF 4.8 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Jianpeng Gao, Liang Sheng, Xinyi Wang, Yanhong Zhang, Liang Li, Baojun Duan, Mei Zhang, Yang Li, Dongwei Hei
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引用次数: 0

摘要

多轴中子/X 射线成像和三维(3D)重建技术在深入了解脉冲辐射源的产生和演化机制方面发挥着至关重要的作用。由于脉冲辐射源的发射时间短(∼200 毫微秒)且变化剧烈,因此必须在几纳秒内获取投影数据才能实现清晰的计算机断层扫描三维成像。因此,在某一时刻可用于计算机断层扫描图像重建的投影数据往往只有几个角度。在利用极其不完整的数据重建三维图像的过程中,所采用的传统算法可能会给最终图像带来严重的失真和伪影。在本文中,我们提出了一种使用圆柱谐波分解和基于深度图像先验方法的自监督去噪网络算法的迭代图像重建方法。我们使用二维总变化先验和三维深度图像先验来增强先验信息。我们在 "秦一号 "设施上进行了五视角四帧的单线 Z-pinch 成像实验,每帧的时间分辨率为 3 毫微秒,相邻帧之间的时间间隔为 40 毫微秒。数值模拟和实验都验证了我们提出的算法可以获得高质量的重建结果,并获得等离子体中极紫外和软 X 射线发射的三维强度分布和演化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Five-view three-dimensional reconstruction for ultrafast dynamic imaging of pulsed radiation sources
Multiaxial neutron/x-ray imaging and three-dimensional (3D) reconstruction techniques play a crucial role in gaining valuable insights into the generation and evolution mechanisms of pulsed radiation sources. Owing to the short emission time (∼200 ns) and drastic changes of the pulsed radiation source, it is necessary to acquire projection data within a few nanoseconds in order to achieve clear computed tomography 3D imaging. As a consequence, projection data that can be used for computed tomography image reconstruction at a certain moment are often available for only a few angles. Traditional algorithms employed in the process of reconstructing 3D images with extremely incomplete data may introduce significant distortions and artifacts into the final image. In this paper, we propose an iterative image reconstruction method using cylindrical harmonic decomposition and a self-supervised denoising network algorithm based on the deep image prior method. We augment the prior information with a 2D total variation prior and a 3D deep image prior. Single-wire Z-pinch imaging experiments have been carried out at Qin-1 facility in five views and four frames, with a time resolution of 3 ns for each frame and a time interval of 40 ns between adjacent frames. Both numerical simulations and experiments verify that our proposed algorithm can achieve high-quality reconstruction results and obtain the 3D intensity distribution and evolution of extreme ultraviolet and soft x-ray emission from plasma.
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来源期刊
Matter and Radiation at Extremes
Matter and Radiation at Extremes Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
8.60
自引率
9.80%
发文量
160
审稿时长
15 weeks
期刊介绍: Matter and Radiation at Extremes (MRE), is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation, and the associated science and technology that are employed to produce and diagnose these conditions in the laboratory. Drivers, targets and diagnostics are included along with related numerical simulation and computational methods. It aims to provide a peer-reviewed platform for the international physics community and promote worldwide dissemination of the latest and impactful research in related fields.
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