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This work investigates the efficacy of “coplanar shielding,” in which copper shields are oriented concentric and coplanar to the RF coils rather than implemented as a full ground plane behind them. Following FDTD simulations to determine optimal shielding parameters, two coil geometries were constructed: a circular loop surface coil and a half-volume five-element receive array. Each was evaluated...
Magnetic resonance (MR) microscopy typically employs microcoils for enhanced local signal-to-noise ratio (SNR). Planar (surface) microcoils, in particular, offer the potential to be configured into array elements as well as to enable the imaging of extremely small samples because of the uniformity and precision provided by microfabrication techniques. Microcoils, in general, however, are copper-loss...
Parallel transmit technology for magnetic resonance imaging can mitigate the challenges with the transmit field (B1) inhomogeneity and capture the increased signal-to-noise ratio benefit at high field strengths. Most of the available parallel transmit systems use conventional amplifier architectures with array coils that employ complex decoupling methods to isolate the individual elements. Current...
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