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US 4,051,377 AGranted
Scanning X-ray examination apparatus
AssigneeU.S. Philips Corporation
InventorsRudolf Kemner, Frans Wessel Zonneveld
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Abstract
The output dose behind the body to be examined in a scanning X-ray examination device is kept constant by controlling the incident dose. As a result, in comparison with known devices an examination can be performed quicker and with a smaller total radiation dose, and a better image of the absorption variations can be obtained.
Claims9
A device for measuring local radiation absorption differences in a body, comprising:
- means for scanning a body with a locally incident radiation beam;
- means for detecting the resulting radiation intensity emerging from the body;
- control means responsive to said detecting means for automatically varying the locally incident dose of radiation so as to keep the detected intensity substantially constant during the entire scanning of the body;
- and
- means responsive to said control means for deriving a signal indicative of the locally incident radiation dose, said signal being a measure of local radiation absorption in the body.
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Dependencies are inferred from the claim text.