一种用于完整表征锥束计算机断层扫描系统的简单精确程序。

A Simple and Precise Procedure for a Complete Characterization of a Cone-Beam Computed Tomography System.

作者信息

Shih Kun-Long, Jin Shih-Chun, Wang Chia-Wei, Chen Jyh-Cheng

机构信息

Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 106344, Taiwan.

Department of Biomedical Imaging and Radiological Sciences, National Yang Ming Chiao Tung University, Taipei 112304, Taiwan.

出版信息

Sensors (Basel). 2025 Feb 20;25(5):1282. doi: 10.3390/s25051282.

DOI:10.3390/s25051282

PMID:40096058

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11902856/

Abstract

In the calibration of cone-beam computed tomography (CBCT), two factors must be checked: the alignment of the imaging detector of the CBCT system and the effect of the slanted sample platform. Previously, we developed and validated a distinct procedure to accurately calibrate any misalignment of the detector by using a cylindrical phantom with beads in a straight line, parallel to the axis of rotation of the CBCT system. Here, we generalize our earlier procedure to calibrate the CBCT system while also detecting and rectifying a slight slant of the sample platform. We revise and validate our new procedure by calibrating the CBCT system, which also determines the tilt angle between the central axis of the phantom and the axis of rotation, when not 0°. The errors in misaligned angles for our new procedure are within ±0.03°, calibrating the CBCT system more precisely than our earlier work. To confirm this, we have performed a complete, precise calibration of a dental CBCT system with a tilting sample platform. We also reconstruct a HA phantom in this CBCT system to analyze the quality of reconstruction. We present here a validated method for calibrating a CBCT system and rectifying the effect of its tilting sample platform with good accuracy.

摘要

在锥束计算机断层扫描（CBCT）的校准中，必须检查两个因素：CBCT系统成像探测器的对准情况以及倾斜样品平台的影响。此前，我们开发并验证了一种独特的程序，通过使用一个带有沿直线排列的珠子且与CBCT系统旋转轴平行的圆柱形体模，来精确校准探测器的任何未对准情况。在此，我们将早期的程序进行推广，以校准CBCT系统，同时检测并纠正样品平台的轻微倾斜。我们通过校准CBCT系统来修订和验证我们的新程序，当体模中心轴与旋转轴之间的倾斜角不为0°时，该程序还能确定此倾斜角。我们新程序的角度未对准误差在±0.03°以内，比我们早期的工作更精确地校准了CBCT系统。为证实这一点，我们对带有倾斜样品平台的牙科CBCT系统进行了完整、精确的校准。我们还在这个CBCT系统中重建了一个羟基磷灰石（HA）体模，以分析重建质量。我们在此展示一种经过验证的方法，可高精度地校准CBCT系统并纠正其倾斜样品平台的影响。