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.
|