Keywords: High-Field MRI, High-Field MRI, Flexible coils, SAR efficiency, Coupling, Non-uniform current distribution
Motivation: At Ultra-High-Field, non-uniform currents have the potential to boost efficiency of loop coils at depth. However, possible advantages of non-uniform current naturally arising from short wavelength at Ultra-High-Field have not been investigated yet.
Goal(s): To characterize the impact of non-uniform currents on SAR efficiency for different coil geometries and coil orientations relative to the main magnetic field, and evaluate the feasibility of using such coils
Approach: Analysis was performed using simulations and experiments
Results: A 62x280mm elongated loop provided higher SAR efficiency than a conventional loop, or a dipole, at depth, with flexibility. low coupling, similar SNR and transmit efficiency than a dipole.
Impact: An elongated design of loops provided higher performance than conventional loops and dipoles in terms of SAR efficiency at depth, with flexibility, and low coupling. Results in this work provide a new avenue to explore in flexible coil design.
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