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Abstract #4384

A Novel Alternating Impedance Transceiver Coil for 7T MRI

James F. Stack, Jr. 1

1Remcom, Inc., State College, PA, United States

Particle Swarm Optimization (PSO) and finite difference time domain (FDTD) simulations are employed to design a novel alternating impedance microstrip resonator (MSR) transceiver array for 7T MRI. The resulting design uses non-uniform spacing of impedance elements to control the B1+ field distribution and improve the peak B1+ value. Comparisons are shown between the optimized geometry, a traditional straight MSR and an alternating impedance MSR with uniformly spaced circular impedance elements.

Keywords

ability acceleration addition additional aims allow alternating alternative appropriate arrays arrived axial axis benefit better beyond biological bounds build built challenges channel circular coil college complete control created design determined diameter diameters dimensions distributed distribution domain effort eight element elements employ employed ends evaluated even experimenting extremely facing feature field fields finalized finding finite fitness five functions future gain generation generations geometry graphics great greater homogeneity impedance improve improved improvements included independently indicates individual inhomogeneities initialized investigation leads loss many micro minimize minutes normalized novel optimal optimization optimized overcome pair pairs parallel particle particles peak performance permitted permitting phantom placed potential power presence previous processor proposed pushed radii radius receive rectangular reduce reduction remaining resonators respectively setting shapes simulations sources spaced spacing spectroscopy spherical square stack straight strong substrate surface swarm symmetrically table taking terminating theory tissues transceiver transmission transmit unfortunately uniform uniformly units variation vary wavelength weak width yield yields