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:
Jul. 08, 1980
Filed:
Apr. 19, 1978
Applicant:
Inventor:
Ian A Fairbairn, Maidenhead, GB;
Assignee:
E M I Limited, Middlesex, GB;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61B / ;
U.S. Cl.
CPC ...
2504 / ; 250355 ;
Abstract
In a variant of the type of radiographic apparatus known as CT scanners a scanning X-ray tube is used to provide a planar fan-shaped distribution and to scan the distribution in its plane. Means are also provided to rotate the system about an axis perpendicular to the plane. In order to properly relate operation of the system, it is desirable to monitor the progress of the tube scan. This invention disposes a detector into the radiation and a pair of gratings acting together to modulate the radiation, incident on the detector, in relation to the scan position. The detector output is processed to give pulses which can be used to regulate the tube scan.