X-ray imaging system with observable image during change of imag

Details X-ray imaging system with observable image during change of imag X-ray imaging system with observable image during change of imag

1992-06-09

1993-03-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

378 99, 358111, H01J 3150, H05G 164

Patent

active

051947269

ABSTRACT:
The invention relates to an X-ray imaging system, comprising an X-ray image intensifier tube in which the electron-optical system can be adjusted to a number of different image formats. By making the image format increase or decrease visibly on the exit screen in the event of a change of image format, annoying visual adjustment effects are avoided and a patient can be continuously observed also in the event of a change of format. Because of the gradual high-voltage variation of the power supply for the electron-optical system, associated with a visible variation of the image format, the output resistance of the power supply circuit may be high. Furthermore, due to the gradual change of the mean intensity on the exit screen of the X-ray image intensifier tube, the control behavior of the automatic exposure control and the automatic gain control of the X-ray imaging system are influenced in a positive sense.

REFERENCES:
patent: 3872302 (1975-03-01), Fender
patent: 4346326 (1982-08-01), Driard et al.
patent: 4809309 (1989-02-01), Beekmans
patent: 4935946 (1990-06-01), Hefter et al.
patent: 4943988 (1990-07-01), Gerlach et al.
patent: 5050198 (1991-09-01), Honda
patent: 5117446 (1992-05-01), Haaker et al.

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