CALIBRATION AND CORRECTION OF SPATIAL DISTORTIONS IN 2D DETECTOR SYSTEMS
CALIBRATION AND CORRECTION OF SPATIAL DISTORTIONS IN 2D DETECTOR SYSTEMS
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DOI：
10.1016/0168-9002(94)90720-x
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发表时间：
1994-07-15
影响因子：
1.4
通讯作者：
THOMPSON, A
中科院分区：
文献类型：
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作者：
HAMMERSLEY, AP;SVENSSON, SO;THOMPSON, A
许多光子和其他辐射二维探测系统都会在记录的数据中引入空间扭曲。只要这些畸变在某种程度上是可重复的，就可以使用已知位置的孔网格来照亮探测器并校准畸变。这种失真的知识可用于校正后续图像。讨论了校准网格设计的各个方面，以达到最佳结果。提出了与已知孔函数的互相关作为估计网格峰值中心的方法，从而提供最佳精度和效率。还提出了有效搜索完整网格的策略。在失真过程的物理模型缺乏或不充分的情况下，双三次样条是用于定义近似空间失真函数的合适插值函数。双三次样条允许足够的灵活性来描述任意扭曲，最重要的是，允许有效计算数据校正。校准和校正算法已经开发出来并应用于二维探测器系统。给出了示例结果。
Many photon and other radiation 2D detection systems introduce spatial distortions into recorded data. As long as these distortions are to some degree repeatable it is possible to use a grid of holes of known positions to illuminate the detector and calibrate the distortion. Knowledge of this distortion can be used to correct subsequent images. Aspects of calibration grid design are discussed with the aim of achieving optimum results. Cross-correlation with known hole functions is proposed as a method for estimating grid peak centres giving optimum accuracy and efficiency. Strategies to search efficiently complete grids are also presented. Where a physical model of the distortion process is lacking or inadequate, bi-cubic splines are as suitable interpolating functions for defining approximate spatial distortion functions. Bi-cubic splines allow both adequate flexibility to describe arbitrary distortions and, most importantly, to allow efficient calculation for the correction of data. Calibration and correction algorithms have been developed and applied to 2D detector systems. Sample results are presented.