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A simplified Katsevich algorithm motivated by the distribution properties of k-lines

机译:受k线分布特性影响的简化的Katsevich算法

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摘要

The Katsevich algorithm is a breakthrough in the theoretically exact algorithms for helical cone beam CT. For future application in medical and industrial CT, determining how to implement it efficiently and accurately is the main task. We analyzed the slope law and intersection law of the k-lines, finding that the k-lines are not intersecting if the half maximal fan angle (HMFA) is less than 21° (numerical solution, so it is approximate) and that the helical pitch and HMFA determine the depth of parallelism of k-lines. Using an appropriate pitch and a HWFA that is less than 21°, one can use a simplified Katsevich algorithm, whose filtration process can be done on the rows of the detector panel so that the pre-weighting, pre-rebinning, post-rebinning and post-weighting steps are all canceled. Simulation experiments show that the simplified algorithm can obtain highly precise images at a faster speed. Our results are intended to be valuable to those who are working on efficient implementations of the Katsevich-type algorithms.
机译:Katsevich算法是螺旋锥束CT的理论精确算法的突破。为了将来在医学和工业CT中的应用,确定如何高效,准确地实现它是主要任务。我们分析了k线的斜率定律和相交定律,发现如果最大扇形的最大半角(HMFA)小于21°,则k线不相交(数值解为近似值),并且螺旋线为间距和HMFA确定k线的平行深度。使用适当的螺距和小于21°的HWFA,可以使用简化的Katsevich算法,该算法的滤波过程可以在检测器面板的行上完成,以便进行预加权,预重新组合,后重新组合和后加权步骤全部取消。仿真实验表明,该简化算法可以更快地获得高精度图像。我们的结果旨在为那些正在努力实现Katsevich类型算法的人们提供有价值的参考。

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