A 3-DIMENSIONAL ANALYSIS OF SLOTTED TUBE RESONATOR FOR MRI

A three dimensional model of a slotted tube resonator (STR) used as a probe in the magnetic resonance imaging (MRI), which is loaded by a di electric body and surrounded by a conducting shield, is analyzed by us ing the variational method and the dyadic Green's function of a circul ar waveguide having a dielectric core. Three surface current modes are properly assumed to expand the currents on the STR. The characteristi cs such as the input impedance, the resonance frequency, the Q value, and the magnetic field distribution are obtained to show the effects o f the dielectric body and the conducting shield. Some theoretical resu lts are compared with the measured data to confirm the validity of the present analysis.