基于TDI CCD的动态成像实验

Dynamic imaging experiment based on TDI CCD

目的延迟积分型电荷耦合器件(time delay integration and charge coupled device,TDI CCD)灵敏度高,并在低照度下具有获得高质量图像的特点,已成为齿科全景数字化成像系统开发的关键技术。在成像过程中要想得到清晰图像,必须正确使用TDI CCD。方法本文采用FCFR-USB9825B系列采集卡等搭建的动态成像装置进行实验,通过改变TDI CCD积分方向和积分时间,采集到不同图像。结果通过对比图像,发现在TDI CCD使用过程中,TDI CCD的积分方向必须与成像物体移动方向保持一致。TDI CCD积分时间与物体移动速度必须匹配,即二者的乘积等于像元尺寸。结论本实验为基于TDI CCD的全景齿科成像奠定了成像理论基础。

Objective Time delay integration and charge coupled device （TDI CCD） with high sensitivity and high-quality image under low illumination plays a pivotal role in the technology of dental panoramic digital radiography system. TDI CCD must be used correctly to obtain clear image. Methods The dynamic imaging equipment composed of acquisition card of FCFR-USB9825B type and so on, is established for getting images by a change of TDI CCD integration time and integration direction. Results TDI CCD integration direction must be in accordance with the image moving direction, TDI CCD integration time must match the image moving speed, which means that the product of integration time and image moving speed is pixel size. Conclusions This experiment establishes the foundation of the imaging theory for the dental panoramic digital radiography system.