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. 30, 1991
Filed:
Feb. 13, 1990
Jay A Chesavage, Palo Alto, CA (US);
MRI Technologies, Mountain View, CA (US);
Abstract
A cylindrical tube with closed ends contains an imaging fluid and a variety of imaging structures enclosed. Included is a slice thickness structure with a hole pattern in a chevron shape where the number of imaged holes determines the slice thickness. Slice planarity is determined by a number of contiguous disks with grooved patterns set at rotated angles with respect to each other. Geometric distortion and resolution are also measured by structures contained within the enclosure. Finally, the position of the first and last slices in a multiscan series is measured for accuracy by ramp wedges placed on the end caps of the enclosure. And lastly, air is entrapped in closed cell foam so there are no unconstrained bubbles migrating in the enclosure.