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:
Mar. 10, 1992
Filed:
Mar. 16, 1989
Applicant:
Inventors:
Andrei Feldman, Paris, FR;
Dominique Cornuejols, Palaiseau, FR;
Assignee:
General Electric CGR S.A., Issy les Moulineaux, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; A61B / ; G01D / ;
U.S. Cl.
CPC ...
36441313 ; 378207 ;
Abstract
The invention relates to x-ray scanners and more particularly to a method for calibrating scanners by means of a single standard of elliptical shape, for example. Attenuation measurements are performed with respect to a number of principal angular positions of the scanner about the standard. In addition, a number of meaurements or views are taken on each side of this principal position in order to compute a mean attenuation with respect to each channel. The attenuation curve is then smoothed by filtering and polynomial approximation.