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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
Publication Date: 1993/05/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
MRI, NMR, slotted tube resonator, shield, antenna, probe,
Full Text: PDF(608.8KB)>>
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.