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一种锥束 CT 系统几何参数标定方法 预览 被引量:8

A Geometry Calibration Method for Cone-Beam Computed Tomography
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摘要 为了解决锥束CT( computed tomography )成像系统中几何参数不能直接测量的问题,提出了一种适用于螺旋扫描轨迹的几何参数标定方法。该方法根据金属钢球的投影轨迹与系统几何参数的关系,构建了仅依赖5个几何参数的非线性最小二乘模型。然后利用Levenberg-Marquardt ( L-M)算法求解该优化模型从而得到系统几何参数的最优解。该方法实现简单,校正体模仅需一个固定在有机玻璃内的金属钢球,而无需专用的校正体模,对校正体模的加工精度要求较低。计算机数值仿真和实际实验的结果表明,该方法具有较高的测量精度,能满足实际应用中高精度重建的需求。 In cone-beam CT imaging system , it is difficult to measure the geometry parameters in a direct way . We propose a novel method for misalignment estimation of cone -beam CT scanners using non -line least square estimation that does not rely on dedicated calibration phantoms .According to the relationship between projection of the metal ball and geometrical parameters , a nonlinear least square model is derived depending on 5 geometrical parameters .The Levenberg-Marquardt ( L-M) algorithm is applied to minimize the optimiza-tion problem .The method is easy to implement and the calibration phantom just need a metal ball in organic glass.Numerical simulation and real experiment results indicate that the method is with high measurement pre -cision and can satisfy the demand of high precision reconstruction in practical application .
作者 张俊 闫镔 陆利忠 李磊 张峰 ZHANG Jun, YAN Bin, LU Li-zhong, LI Lei, ZHANG Feng (Information Engineering University, Zhengzhou 450002, China)
机构地区 信息工程大学
出处 《核电子学与探测技术》 CAS CSCD 北大核心 2014年第2期235-238,242共5页 Nuclear Electronics & Detection Technology
基金 国家高技术研究发展计划“863计划”(2012AA011603).
关键词 成像系统 锥束CT 几何校正 螺旋扫描轨迹 imaging system conebeam CT geometry calibration spiral trajectory
作者简介 张俊(1987-),男,云南大理人,硕士研究生,研究方向:CT成像技术与应用。
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参考文献10

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