The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 1981
Filed:
May. 09, 1979
John L Ryan, Chalfont St. Peter, GB;
EMI Limited, Hayes, GB;
Abstract
In CT scanners signals representing attenuation of radiation along beam paths through the patient may be processed by a convolution technique to give radiation absorption values for a matrix of elements in a region of interest. It the beams are distributed in a fan-shape from a focus the convolution can be applied but the signals need to be weighted by a factor related to the distance of a respective matrix element from the focus. By consideration of the geometry of a CT scanner of this kind it has been found that the weighting may be achieved more efficiently if the signals for all beams are preweighted by a factor related to the angular position of the beam in the fan, leaving only a simple scaling factor which needs to be applied for each martrix element.