Patent ID: 7747310

Claim:
An intracavity probe for use with a magnetic resonance (MR) system for obtaining images or spectra of a region of interest within a cavity of a patient, said intracavity probe comprising: (a) a coil loop for receiving MR signals from said region of interest, said coil loop having a plurality of capacitors therein, said plurality of capacitors including (i) a first drive capacitor and a second drive capacitor of approximately equal value serially connected within said coil loop and at a junction node thereof forming a virtual ground for electrically balancing and impedance matching said coil loop and (ii) a tuning capacitor serially connected within said coil loop diametrically opposite said junction node of said drive capacitors and having a value selected to resonate said coil loop at an operating frequency of said MR system; and (b) an output cable for connecting said coil loop to an interface device for said intracavity probe, said output cable at one end thereof being connected across one of said drive capacitors and at an other end thereof having a plug for connection to said interface device, said output cable having an electrical length of n(λ/2)+S L wherein n is an integer, λ is a wavelength of said operating frequency of said MR system, and S L is a supplemental length whose reactance is of a same magnitude as a reactance of one of said drive capacitors.