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An interval subdividing based method for geometric calibration of cone-beam CT

机译：基于区间细分的锥束CT几何标定方法

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摘要

This paper presents a new method based on interval subdividing for geometric calibration in cone-beam CT system. The proposed method uses experimental data and requires no prior knowledge of the object. The geometric system is parameterized at first and the two critical misalignment parameters, that is, the transversal shift and the skew of the detector, are varied until achieving their values with high accuracy, which depends on maximizing the value of Q proposed in the method. To validate this method, numerical phantoms with and without noise are simulated respectively. The results demonstrate that this method is capable of achieving high accuracy for the parameters and is robust to the noise. Each parameter can be aligned utilizing this method individually. And this method has advantages in high resolution CT, in which many factors can affect the stability of the mechanical system. The results of reconstructions for a machine part demonstrate that this method can calibrate the parameters with high accuracy and converge quickly.
机译：本文提出了一种基于区间细分的锥束CT系统几何标定新方法。所提出的方法使用实验数据并且不需要对象的先验知识。首先对几何系统进行参数设置，然后改变两个关键的失准参数，即横向偏移和检测器的偏斜，直到获得高精度的值为止，这取决于最大化方法中提出的Q值。为了验证该方法，分别模拟了有噪声和无噪声的数字体模。结果表明，该方法能够实现较高的参数精度，并且对噪声具有鲁棒性。可以使用此方法分别对齐每个参数。并且该方法在高分辨率CT中具有优势，其中许多因素会影响机械系统的稳定性。机器零件的重建结果表明，该方法可以高精度校准参数并快速收敛。

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  • 来源
    《NDT & E international》 |2013年第9期|49-55|共7页
  • 作者

    Shengqi Tan; Peng Cong; Ximing Liu; Zhifang Wu;

  • 作者单位

    Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;

    Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;

    Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;

    Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cone-beam computed tomography; Geometric calibration; Interval subdividing;

    机译：锥形束计算机体层摄影术;几何校准;间隔细分;

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