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:
May. 28, 2002
Filed:
Sep. 17, 1999
Michael Burl, Chagrin Falls, OH (US);
Robert C. Gauss, Aurora, OH (US);
Philips Medical Systems (Cleveland), Inc., Highland Heights, OH (US);
Abstract
A tunable radio frequency birdcage coil ( ) has an improved tuning range for use with a magnetic resonance apparatus. The coil includes a pair of end ring conductors ( ) which are connected by a plurality of spaced leg conductors (L , L , . . ., L ) to form a generally cylindrical volume. Both the end rings and the leg conductors contain reactive elements, preferably capacitors (C , C , . . ., C ). The radio frequency coil also includes a pair of tuning rings ( ) for tuning the reactive elements (C , C , . . ., C ), which each include a non-conductive support cylinder ( ) and a plurality of tuning bands ( and ) which extend axially along the outer surface of the support cylinder ( ). The tuning rings ( ) are rotated or translated with respect to the leg conductors (L , L , . . ., L ) in order to vary capacitance and inductance of the coil ( ) to tune the ( ) coil to the desired resonant frequency.