Patent ID: 6301331
Filing Date: 2001-10-09
Classification: H05G

Abstract:
A digital radiography system comprising:an X-ray source irradiating an object to be inspected with X-rays;an X-ray image intensifier tube receiving the X-rays which passes through the object and converting the received X-rays into an output optical image, a diameter of an input image of said X-ray image intensifier tube ranging from 305 to 406 mm, a diameter of an output image of said X-ray image intensifier tube ranging from 58 to 62 mm, and a ratio of the diameter of the input image to the diameter of the output image rdnging from 5 to 7;a video camera picking up the output optical image, said video camera having a plurality of scanning modes including a fluoroscopic mode and a radiographic imaging mode, said fluoroscopic mode monitoring a real-time X-ray image of the object irradiated by the X-rays, and said radiographic imaging mode recording an X-ray image of the object irradiated by X-rays, said video camera having a beam scanning area on an image pickup surface thereof which is the same for both said fluoroscope mode and said radiographic imaging mode;an optical system including a plurality of lenses, said optical system being disposed between said X-ray image intensifier tube and said video camera so as to output substantially the same size output optical image of the X-ray image intensifier tube on the video camera in both of said fluoroscopic mode and said radiographic imaging mode;image processing means for converting an output from said video camera into a digital signal to obtain digital image data; andimage displaying means for displaying an X-ray image by reading out said digital image data from said image processing means.