摘要
在口腔锥形束CT的设计中,X射线源的控制、平板探测器的实时采集以及机械结构的运动这三者的协同工作直接影响成像质量。本文在充分分析平板探测器时序信号特征基础上,研究利用微处理机控制器(MCU)、复杂可编程逻辑器件(CPLD)和光耦等元件设计并实现同步曝光控制系统。利用该系统获取投影图像,分析其稳定性、线性一致性、信噪比(SNR)并进行FDK算法重建,以验证同步曝光控制系统的设计性能。实验结果表明该系统性能良好,可满足三者间的协同工作。
In the design of oral cone beam CT, cooperation between synergic control of X-ray source, real-time acqui- sition of flat detector and motion of mechanical structure affects the CT image quality. Based on the full analysis of the flat detector＇s timing signal characteristics, this research was carried out with microprocessor controller （MCU）, complex programmable logic device （CPLD）, and light couplings to design and realize synchronous exposure control system. To evaluate whether the design of the synchronous exposure control system in this project could reach the required imaging accuracy, we employed the projected images in the system to analyze its stability, linear consisten- cy, signal to noise ratio and precede the FDK construction.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2014年第6期1283-1287,共5页
Journal of Biomedical Engineering
基金
广东省战略性新兴产业核心技术攻关资助项目(2011A081402003)
广州市战略性新兴产业重大专项基金资助项目(2011Y1-00019)
关键词
锥形束CT
平板探测器
机械结构
同步控制
cone beam CT
flat detector
mechanical structure
synchronous control
