摘要
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.
出处
《液晶与显示》
CAS
CSCD
北大核心
2014年第3期455-460,共6页
Chinese Journal of Liquid Crystals and Displays
基金
国家重大科学仪器设备开发专项(No.2011YQ040082)
国家科技支撑计划(No.2012BAI13B00)
