摘要
计算机断层成像术(Computed Tomography,简称CT)是用来获取观测目标断层图像的一门技术。然而,在CT系统安装时往往存在误差,从而影响成像质量,因此需要对安装好的CT系统进行参数标定。在探测器单元等距的前提下,首先计算出探测器单元之间的距离,然后以正方形托盘中心为坐标原点建立直角坐标系,分别找到几种特殊的旋转方向,进而找出旋转中心坐标(-9.27,6.27),最后计算出每次的旋转方向。数值实验表明,该模型简单易行,计算结果比较准确。
CT, computed tomography, is a technology used to obtain the tomography image of the observation target. However, there are often errors in the installation of CT system, which may affect the imaging quality. It is necessary to calibrate the parame-ters of the installed CT system. On the premise of equidistance in detector unit, firstly, the distance between the detectors is calcu-lated. Secondly, a rectangular coordinate system is set up with the square tray center as the origin of coordinates to find some special directions of rotation respectively and then find out the center of rotation. Finally, the direction of each rotation is calculated. Numer-ical experiments show that the model is with high measurement precision and can satisfy the demand of high precision reconstruction in practical application.
出处
《渭南师范学院学报》
2017年第24期38-42,共5页
Journal of Weinan Normal University
基金
陕西省扶持学科基金资助项目:基于小波的图像加密算法研究(9)
渭南师范学院教育科学研究项目:以一个数学教研室为例研究中学数学教师的教育科研能力(2016JYKX018)
渭南师范学院特色学科建设项目:数学方法在秦东经济社会发展中的应用(14TSXK02)