为满足CT图像重建系统的实时处理要求，提出了一种基于FPGA实现CT图像重建的加速方法。首先将滤波反投影算法进行并行性分解，然后采用并行流水线设计思想，给出了算法在FPGA上实现的总体结构，并且分别给出滤波、反投影、循环累加等主要功能单元的电路设计,最后在FPGA上实现了12条并行流水线重建系统。实验结果表明，与基于CPU的图像重建相比较，基于FPGA的重建系统重建出的图像绝对误差小于04%，加速比在100倍以上，且重建图像的规模越大，加速效果越明显。

To fulfill the real-time processing requirement of computerized tomography image reconstruction, a FPGA-based accelerated CT image reconstruction method was proposed. Firstly, filtering projection algorithm was broken down by parallelism.Then the FPGA-based processing structure was proposed by using the parallel pipeline technology, and the designs of the main units of the method were discussed, including the designs of the filter, back-projection, and accumulation.Lastly, the system which includes 12 parallel processing pipelines was implemented on FPGA. The simulation results showed that,compared with the CPU reconstruction, the FPGA-based reconstruction achieved that reconstruction absolute error is less than 04% and the speedup ratio is more than 100, its speedup effect is more obvious when it is applied to larger amount of reconstructed image.