高精度X射线数字成像检测中图像快速采集方法

高分辨率X射线数字成像检测系统的图像数据量大，而且要求较远距离传输。图像采集速度将直接影响检测速度，为此设计了科学级大面阵电荷耦合器件(CCD)信号读出与调理、A／D转换、数据远距离传输并行工作(流水线)方式的图像采集系统，利用了计算机并行口的增强并行接口(EPP)工作方式的地址读和数据字读的选通信号来控制各部分工作和数据快速采集，并用多位晶体管—晶体管—逻辑(TTL)和RS422标准转换方法，实现了射线数字成像系统中数据的远距离并行传输。

QUICK DATA ACQUISITION METHOD IN HIGH PRECISION X-RAY DIGITAL IMAGE TESTING

Large numbers of image data need to be quickly and transferred over relatively long-distances in high resolution x-ray digital testing systems. The speed of image data acquisition influences directly the test speed. In order to increase the speed data acquisition of an acquisition system in parallel mode (pipeline mode)for CCD readout and adjustment, A/D conversion and data transfer is designed. Signals of address and data in computer EPP are used for controlling the work of each unit and data acquisition. By using the method of TTL to RS422 level conversion, the distant data parallel transfer of digital radiological image are realized.