Geometric artifacts correction of equiangular fan-beam industrial CT system

IF 4.1 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Ndt & E International Pub Date : 2024-07-15 DOI:10.1016/j.ndteint.2024.103197

Shu Xu , Jinyin Sheng , Zhongming Li , Chao Long , Yijun Jiang , Hui Tan , Liming Duan

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Abstract

To address the issue of geometric artifacts in equiangular fan-beam industrial computed tomography (CT) systems, this paper proposes a projection sinogram-based method for correcting these artifacts. Firstly, we discuss the formation mechanism of geometric artifacts in equiangular fan-beam industrial CT system when there is geometric deviation. Secondly, we establish a geometric model that incorporates these deviations and mathematically describe the projected position curve of a point within the plane. Subsequently, we use a needle gauge as a surrogate for the point, and fit the curve in the projection sinusoidal graph obtained from scanning the needle gauge to calibrate the geometric deviations. Finally, we introduce the calibrated geometric deviations into the filtered back projection (FBP) algorithm to achieve more accurate reconstructed images. The proposed method precisely calibrates geometrical deviations in the equiangular fan-beam industrial computed tomography (CT) system and effectively eliminates geometric artifacts in the reconstructed CT images, this is demonstrated by simulation and practical experiment. This method has also been successfully applied in engineering practice.

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等角扇形梁工业 CT 系统的几何伪影校正

针对等角扇形光束工业计算机断层扫描（CT）系统中的几何伪影问题，本文提出了一种基于投影正弦图的伪影校正方法。首先，我们讨论了等角扇形束工业计算机断层扫描系统中存在几何偏差时几何伪影的形成机制。其次，我们建立了一个包含这些偏差的几何模型，并对平面内点的投影位置曲线进行了数学描述。随后，我们使用针规作为该点的替代物，并在扫描针规获得的投影正弦曲线图中拟合曲线，以校准几何偏差。最后，我们将校准后的几何偏差引入滤波背投影（FBP）算法，以获得更精确的重建图像。所提出的方法精确校准了等方位扇形光束工业计算机断层扫描（CT）系统中的几何偏差，有效消除了重建 CT 图像中的几何伪影，并通过模拟和实际实验证明了这一点。该方法也已成功应用于工程实践。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ndt & E International 工程技术-材料科学：表征与测试

CiteScore

7.20

自引率

9.50%

发文量

121

审稿时长

55 days

期刊介绍： NDT&E international publishes peer-reviewed results of original research and development in all categories of the fields of nondestructive testing and evaluation including ultrasonics, electromagnetics, radiography, optical and thermal methods. In addition to traditional NDE topics, the emerging technology area of inspection of civil structures and materials is also emphasized. The journal publishes original papers on research and development of new inspection techniques and methods, as well as on novel and innovative applications of established methods. Papers on NDE sensors and their applications both for inspection and process control, as well as papers describing novel NDE systems for structural health monitoring and their performance in industrial settings are also considered. Other regular features include international news, new equipment and a calendar of forthcoming worldwide meetings. This journal is listed in Current Contents.