求翻译：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影（Filtered Backprojection，FBP） ，该算法由于其易于理解、便于实现、重建效果好，在目前 CT 中广泛使用。是什么意思？

However, the reconstruction algorithm based on parallel projection is after the three-dimensional fan-beam and cone-beam reconstruction algorithm based on their core algorithms are filtered back projection (Filtered Backprojection, FBP), the algorithm because of its easy to understand, easy to imple

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However is actually after fan ties and the awl based on the parallel projection reconstruction algorithm ties the three dimensional reconstruction algorithm the foundation, their core algorithm all is the filter counter-projection (Filtered Backprojection, FBP), because this algorithm it easy to und

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