Investigation of an FFT-based correlation technique for verification of radiation treatment setup.
Investigation of an FFT-based correlation technique for verification of radiation treatment setup.
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研究基于 FFT 的相关技术，用于验证放射治疗设置。
DOI：
10.1118/1.596743
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发表时间：
1991
期刊：
影响因子：
3.8
通讯作者：
A. Boyer
中科院分区：
文献类型：
--
作者：
S. Jones;A. Boyer
借助于真实的操作的计算机数据采集系统以电子方式捕获患者的治疗区域的图像的电子射野成像设备正在变得可用。本文报告了一项关于射野验证相关算法的研究，该算法可以将每个治疗射野图像与正确治疗射野定位的图像进行比较。该算法不需要人为干预或分析的图像，而是使用快速傅立叶变换，以产生一个相关分布。相关性分布最大值的位置和幅度被测试为成对图像之间的受试者位置的平移和旋转差异的客观度量。通过使用原型算法来测试该概念，以获得Alderson Rando头部体模图像的相关分布。将具有各种误差的体模设置图像与初始正确治疗位置的体模图像进行比较。研究了平移、平面内和平面外旋转以及平移和旋转的组合。该算法准确地测量了翻译。相关分布最大值被认为是一个合理的候选人的对齐参数，可容忍的误差阈值可能会建立。
Electronic portal imaging devices that capture an image of a patient's treatment field electronically by means of a computer data acquisition system operating in real time are becoming available. This paper reports on a study of a field verification correlation algorithm that can compare each treatment portal image to an image of the correct treatment field positioning. The algorithm requires no human intervention or analysis of the images but rather uses fast Fourier transforms to produce a correlation distribution. The position and amplitude of the correlation distribution maximum were tested as objective measures of translational and rotational differences of subject positions between pairs of images. The concept was tested by using a prototype algorithm to obtain the correlation distributions for images of an Alderson Rando head phantom. Images of the phantom setup with various errors were compared with an image of the phantom in the initial, correct treatment position. Translations, in-plane and out-of-plane rotations, and combinations of translations and rotations were studied. The algorithm accurately measured translations. The value of the correlation distribution maximum was found to be a reasonable candidate for an alignment parameter for which tolerable error thresholds might be established.