基于CDD函数的ICT系统设计技术

Design technique based on CDD function for industrial CT system

工业计算机层析成像(ICT,Industrial Computed Tomography)是一种先进的非接触式无损检测技术,具有复杂精密、非通用和高成本的特点,需要根据用户的具体检测需求进行定制开发,以降低系统研发风险和成本.为此,提出并研究了一种基于对比度-细节-剂量(CDD,Contrast-Detail-Dose)函数的ICT系统设计技术框架.据此,推导了扇束三代二维ICT系统基于CDD函数的设计平台,并完成了软件开发.该项技术包括基于CDD函数的计算机辅助设计(CAD,Computer Aided Design)模块、扇束三代二维ICT成像数字仿真模块和CT图像性能评定模块3部分.其输入参数是表征用户检测需求的初始设计参数,输出参数是满足用户检测需求的最优解.初始设计参数首先进入CAD模块完成性能考核;如果满足要求,再进入仿真模块完成仿真考核;最后,对仿真结果进行量化评定,得到设计参数对应的系统性能指标.计算机仿真和工程系统开发结果验证了该设计技术的有效性.

Industrial computed tomography（ICT） is an advanced, non-contact and non-destructive testing method. It is complicated, non-universal and expensive, it is necessary to make the custom development to reduce the risk and the cost. A kind of design technique frame based on the contrast-detail-dose（CDD） function was proposed for the development of ICT system. According to this frame, the design method for fan-beam 3rd generation two dimensional ICT（2D-ICT） was deduced and the corresponding software platform was implemented which is consisted of three parts. They are the computer aided design（CAD） part based on the CDD function, the simulation part and the performance evaluation part. The initial design parameters firstly entered the CAD part. They secondly entered the simulation part if they passed the CAD check. The simulation results were finally evaluated by the evaluation part. The validity of the proposed method was proved by the computer simulation and the example of the engineering development.