X-ray device including a primary diaphragm device
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United States of America Patent
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May 23, 2000
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N/A
app pub date -
Jan 20, 1998
filing date -
Jan 27, 1997
priority date (Note) -
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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).
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