Appeal No. 1997-2030
Application 08/400,287
intensifier tube in a video camera for pickup of the output image of an image intensifier
tube .
Independent clam 25 is reproduced as follows:
25. 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 ranging 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
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