Fast cone-beam computed tomography geometric calibration method based on measuring tools

被引：0
|
作者：
Zhang C. [1 ]
Huang K. [2 ]
Chen H. [1 ]
机构：
[1] Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang
[2] Key Lab of Contemporary Design and Integrated Manufacturing Technology, Northwestern Polytechnical University, Ministry of Education, Xi'an
来源：
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | 2019年 / 40卷 / 01期
关键词：
Calibration; Cone-beam computed tomography(CT); Edge detection; Geometric parameters;
D O I：
10.19650/j.cnki.cjsi.J1804291
中图分类号：
学科分类号：
摘要：
Inaccurate geometric parameters of the cone beam CT will bring artifacts in the reconstructed image, which affect analysis and judgment results. To obtain the geometric parameters of cone-beam CT quickly and reliably, a calibration method of cone-beam CT geometric parameters based on the calibration measuring tool is proposed. The basic structure of the calibration measuring tool is the plexiglass tube embedded in a metal filament and an externally embedded metal ball. A certain number of projection images are obtained by scanning a single circular trajectory with measuring tool, and the obtained projection images are superimposed. The symmetry axis is fitted according to the symmetry characteristic of the superimposed image. The coordinates of the beam center are obtained by the proportional relationship between the intersection of the metal ball trajectory and the rotation axis. Finally, the measuring tool is translated by a certain distance. This distance from the source to the center of rotation and the detector are calculated according to the corresponding geometric relationship between the diameter of measuring tool and its projection. Experimental results show that the proposed method can obtain reliable cone-beam CT geometric parameters, which has the characteristics of fast calibration speed and strong robustness. © 2019, Science Press. All right reserved.
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页码：175 / 182
页数：7
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