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Abstract #4374

Near-Field Wave Impedance Matching with High-Permittivity Dielectric Materials for Optimum Transmittance in MRI Systems

Giuseppe Carluccio1, Sukhoon Oh1, Qing Yang2, Danilo Erricolo3, Ray Weiluo2, Christopher Michael Collins1

1Radiology, New York University, New York, United States; 2Radiology, Pennsylvania State University, Hershey, PA, United States; 3Electrical and Computer Engineering, University of Illinois at Chicago, Chicago, IL, United States

A method to find the optimum permittivity of the dielectric pads that maximizes the matching by analyzing with a simple 1D analytical model the near field wave impedance of the fields generated by a magnetic loop which propagate through different materials. The permittivity values that maximize the matching in this simplified model are compared with the permittivity values that maximize the B1 field in 3D simulations to investigate the correlation between matching and high permittivity dielectric pads.

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Keywords

addition adjacent among analytical analyzed analyzing angular behavior better body changing coefficients coil compatibility computed computer condition conductivity confirm consequent continuity correlation curve curves despite determine determines dielectric dipole distance distribution efficiency electrical electromagnetic engineering enhance equal fact field fields frequency full generated geometry guarantees hence homogeneous human imaginary impedance imposed incident increasingly indicate interface interfaces intermediate investigate larger layer layers located loop match matching material materials maximize maximized maximizes model much near needs numerical ones operating optimum pads permeability phantom plus power predicted propagate propagation properties propose quantifying quickly radiology reflected reflection reflectivity relationship representing represents respect respectively role scenario scenarios seems several simple simplicity simplified simulations since source span spatial speed square subject systems third tissue tissues transmission transmit transmittance transmitted unidimensional unit valid varies varying wave yang