X-ray device including a primary diaphragm device

Details X-ray device including a primary diaphragm device X-ray device including a primary diaphragm device

1998-01-20

2000-05-23

Porta, David P.

X-ray or gamma ray systems or devices

Electronic circuit

With display or signaling

378108, H05G 136

Patent

active

060673435

ABSTRACT:
The invention relates to an X-ray device which includes a primary diaphragm device (3) for limiting the X-ray beam and a control circuit (10) for automatic exposure control, which control circuit includes a detector (9) with at least one measuring field (31) which measures the X-ray dose rate. Whereas in the case of customary exposure control systems the X-ray dose is increased when the radiation beam is strongly limited so that parts of the measuring field (31) are not exposed, which could lead to overexposed X-ray images, the X-ray device according to the invention is provided with means (12, 14, 15, 16, 17) for determining a correction value (K) which is dependent on the dimensions of the exposed area (33) of the measuring field (31) and acts on the control circuit (10) in such a manner that an increase of the X-ray dose is even avoided in the case of a partly non-exposed measuring field (31).

REFERENCES:
patent: 3995161 (1976-11-01), Lux
patent: 4573183 (1986-02-01), Relihan
patent: 5260984 (1993-11-01), Horbaschek
patent: 5287396 (1994-02-01), Stegehuis
patent: 5396531 (1995-03-01), Hartley

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