Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1989-08-01
1990-08-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
358111, H01J 314, H01J 516
Patent
active
049527940
ABSTRACT:
As a result of the use of a slow phosphor in the exit screen of an X-ray image intensifier tube, a number of image fields can be picked up by means of the comparatively fast television camera during the afterglow of the phosphor. This enables quantum noise integration and, when use is made of a CCD camera upon display, a resolution can be achieved upon display which corresponds to the resolution of a conventional pick-up tube. Moreover, in accordance with the invention it is no longer necessary to use a controllable diaphragm and a complex interface for the asynchronous pick-up and reading of the image information.
REFERENCES:
patent: 4017679 (1977-04-01), Kemner et al.
patent: 4220890 (1980-09-01), Beekmans
patent: 4352127 (1982-09-01), Tsuchiya
patent: 4852139 (1989-07-01), Sandrick et al.
Kemner Rudolf
Stouten Johannes J.
Zuidhof Pieter
Beck George
Nelms David C.
Squire William
U.S. Philips Corporation
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