Abstract
A radio-frequency coil, for nuclear magnetic resonance imaging at Larmor frequencies associated with a magnetic field of greater than about 0.5 Tesla, comprises a slotted-tube radio-frequency resonator having an elliptical cross-section. First and second complementary outer resonator portions have central bands connecting juxtaposed wing structures; the end of each of the four wings is spaced from a complementary wing portion of the other outer portion and capacitively coupled thereto. An inner structure has a pair of elliptical guard rings placed substantially in registration with the elliptical portions of the outer structure wing portions. The eccentricity ratio of the elliptical cross-section of the resonator and the resonator dimensions are arranged to provide an interior volume into which a human head or body extremity can be placed for imaging purposes.
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