Analysis of MRI Slotted Tube Resonator Having a Shield of Conducting Circular Cylinder

Qiang CHEN  Kunio SAWAYA  Saburo ADACHI  Hisaaki OCHI  Etsuji YAMAMOTO  

IEICE TRANSACTIONS on Communications   Vol.E76-B   No.5   pp.553-560
Publication Date: 1993/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
MRI,  NMR,  slotted tube resonator,  shield,  antenna,  probe,  

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A slotted tube resonator (STR) having a shield of conducting circular cylinder which is used as a probe for the magnetic resonance imaging (MRI) is analyzed by using the variational method and the dyadic Green's function of a circular waveguide. Three surface current modes are employed to expand the currents on the STR. Quadruple integrals appearing in the variational expression are evaluated analytically for saving the CPU time. Resonant frequency, Q value and the magnitude of magnetic field distributions for various radii of the shields are obtained to show the effects of the shield. Some measured date are compared with the theoretical results to confirm the validity of the present analysis.