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ＣＴ（ＣｏｍｐｕｔｅｒｉｚｅｄＴｏｍｏｇｒａｐｈｙ）图像重建是一种运算量很大的数据处理过程。特别是三维ＣＴ，其巨大的运算量成为该技术发展的主要障碍之一。采用并行处理技术提高运算速度被公认为是解决这一问题的最好途径。本文具体介绍了采用多处理器并行处理技术实现三维ＣＴ高速图像重建的“环形移位悬浮存储器”并行图像重建系统ＰＩＲＳ－４（４－ｐｒｅｅｅｓｓｏｒＰａｒａｌｌｅｌＩｍａｇｅＲｅｃｏｎｓｔｒｕｃｔｉｏｎＳｙｓｔｅｍ）的体系结构和硬件、软件设计，包括系统结构与配置、交叉开关网络的设计以及控制模块的硬件细节，系统工作流程、卷积反投影图像重建算法描述、操作系统与编程语言的选择、仿ＥＭＳ方式的原理和浮点数的直接内存读写等。并给出了在ＰＩＲＳ－４上实现ＣＴ图像重建的实验结果及分析。
Computerized Tomography (CT) image reconstruction is a kind of data processing process with a large amount of computation. Especially for three-dimensional CT, the huge amount of computation has become one of the major obstacles to the development of this technology. The use of parallel processing techniques to increase the speed of operation is recognized as the best way to solve this problem. This paper introduces in detail the architecture and hardware and software design of the “PIRS-4” parallel image reconstruction system (PIRS-4) for high-speed 3D image reconstruction using multi-processor parallel processing technology, including system architecture and Configuration, cross-switch network design, and control module hardware details, system workflow, convolutional back-projection image reconstruction algorithm description, selection of operating system and programming language, principle of imitation EMS, and direct memory read and write of floating-point number. The experimental results and analysis of CT image reconstruction on PIRS-4 are given.