Device for measuring radiation absorption
CA 1069222 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Meyer-Ebrecht, Dietrich; Kowalski, Gunter; Groh, Gunther
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In X-ray scanners operating with a large number of detectors ("fan scan") the problem exists that reconstruction errors occur in and about the centre of rotation which errors, are caused by the fact that the radiation absorption in said area is substantially always measured by the same detectors and that the sensitivity of all detectors is not exactly the same. The invention provides an improvement in that the measurement is carried out with a larger number od detectors than is necessary for the measurement of the scanning field and that the detector arc pivots about its centre of curvature during the measurement. As a result of this the absorption in the centre of rotation is measured by …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 1, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.