X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Patent
1991-12-31
1994-02-15
Porta, David P.
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
378151, 378152, H05G 164
Patent
active
052873960
ABSTRACT:
A contour is determined in the X-ray image by an image processing unit in an X-ray examination apparatus. An arithmetic processor responsive to the processing unit determines the position of X-ray absorbing diaphragm slats which enclose a minimum area situated around the contour of an object image. The diaphragm slats are moved to the correct position by a drive unit. As a result, overexposure of the X-ray image in the intensifier tube is counteracted and the medical details in the image become more distinct. Image harmonization are realized using X-ray absorbing wedges. Placing the wedges in excessively light parts of the X-ray image enables the dynamic range to be increased at areas of interest. The position of the wedges is calculated on the basis of a dose calculation based on exposure time, the voltage and the current applied to the X-ray source, these quantities being applied to the arithmetic processor via a control unit.
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Porta David P.
Slobod Jack D.
U.S. Philips Corporation
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