The use
of a close-fitting roughly head-shaped volume coil for MRI has the merit of
improving the SNR from the brain. However, the surface of
the RF coil follows that of the head, making it difficult to determine the optimal
coil winding pattern. Here, we proposed a method which combines finite element
method simulation and linear programing to optimize the coil pattern of a
close-fitted RF coil with the objective of maximizing its SNR and
RF-magnetic-field homogeneity for operation at ultra-low field (6.5
mT, 276 kHz). We then tested the optimized coil by imaging a
water-filled phantom using a 3D-bSFFP.
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