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AssigneeU.S. Philips Corporation
InventorsRudolph M. Snoeren, Petrus W. J. Linders, Christianus G. L. M. Nederpelt
Estimating the term…
An X-ray examination apparatus includes an X-ray source (1) for emitting an X-ray beam, an X-ray detector (6) for detecting an X-ray image and converting it into an optical image, and a video extractor (8) which is coupled to the X-ray detector (6) via optical coupling means (9). The optical coupling means (9) is provided with an optical pick up (11) for feeding a fraction of the light flux to a photosensor (12) which produces a control signal for adjusting the X-ray flux from the X-ray source (1). The photosensor (6) is provided with an array of pixels, with weighting means for the signals detected in or by each of said pixels, and with means for determining a mean value of the detected and weighted signals, yielding a control signal which is fed back in order to adjust the X-ray flux from the X-ray source (1).
An X-ray examination apparatus, including an X-ray source (1) for emitting an X-ray beam, an X-ray detector (6) for detecting an X-ray image and converting it into an optical image, and a video extractor (8) which is coupled to the X-ray detector (6) via optical coupling means (9), the optical coupling means (9) being provided with an optical pick up (11) for feeding a fraction of the light flux to a photosensor (12) which produces a control signal for adjusting the X-ray flux from the X-ray source (1), characterized in that the photosensor (6) is provided with an array of pixels, with weighting means for the signals detected in or by each of said pixels, and with means for determining a mean value signal from the detected and weighted signals, thus yielding a control signal which is fed back in order to adjust the X-ray flux from the X-ray source (1).
An X-ray examination apparatus, including an X-ray source for emitting an X-ray beam, an X-ray detector with a sensor for detecting an X-ray image on the basis of pixels, and a video extractor which is coupled to the X-ray detector and arranged to generate, in response to signals detected in each of said pixels, a control signal for adjusting the X-ray flux from the X-ray source, characterized in that the video extractor is provided with weighting means for the signals detected in or by each of said pixels, and with means for determining a mean value signal from the detected and weighted signals, which mean value signal forms the basis of said control signal.
A camera system, including a detector for detecting an optical image, and a video extractor which is coupled to the detector via optical coupling means, the optical coupling means being provided with an optical pick up for feeding at least a fraction of the light flux to a photosensor which produces a control signal for adjusting the iris and/or the shutter of the camera system, characterized in that the photosensor is provided with an array of pixels, with weighting means for the signals detected in or by each of said pixels, and with means for determining a mean Value of the detected and weighted signals, yielding a control signal which is fed back in order to adjust the iris and/or the shutter of the camera system.
An X-ray system, including
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