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:
Sep. 22, 1987
Filed:
Feb. 10, 1986
Mitsuaki Arakawa, Hillsborough, CA (US);
John H Fehn, El Sobrante, CA (US);
Lawrence E Crooks, Richmond, CA (US);
The Regents of the University of California, Berkeley, CA (US);
Abstract
First and second co-located axially extending RF coils are displaced spatially with respect to one another by 90 degrees so as to produce a pair of RF signals from the enclosed volume which are in phase quadrature. The same coils or one of them may also be utilized for transmitting NMR RF signals into the same volume. The coils have a common open-end through which objects to be imaged may be inserted and a common 'closed' end for convenient location of RF coupling and feeding structures. Each of the coils has an RF feedline structure which extends across a diameter of common closed end and the two feedline structures are disposed substantially perpendicular with respect to one another so as to minimize cross coupling. The feedlines are also spatially configured to facilitate mounting of associated tuning and coupling capacitors. A fixed coupling 'paddle' provides cancellation coupling between the coils and a movably mounted coupling paddle is arranged to provide variable amounts of cancellation coupling between the orthogonal feedline structures. The phase quadrature RF signals emanating from the pair of coils are preferably amplified before being combined in a 90.degree. RF hybrid circuit.