求翻译：法最为简单，运算量最小，但是扫描时间长，仅在第一代 CT 中得到应用。然而基于平行投影的重建算法却是之后的扇束及锥束三维重建算法的基础，它们的核心算法都是滤波反投是什么意思？

The most simple method, computing the minimum amount, but the long scan time, only the first generation of CT has been applied. However, the reconstruction algorithm based on parallel projection is after the three-dimensional fan-beam and cone-beam reconstruction algorithm based on their core algori

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The law is simplest, the operand is smallest, but the scanning time is long, only obtains the application in first generation of CT.However is actually after fan ties and the awl based on the parallel projection reconstruction algorithm ties the three dimensional reconstruction algorithm the foundat

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