Abstract
In ultra-high-field magnetic resonance imaging (MRI), inhomogeneity of the radiofrequency transmit field (| B 1 + |) occurs due to wavelength shortening that results from interactions between the coil and the high dielectric subject. Even if a multiple transmit/receive (Tx/Rx) coil array is employed using the first-order clockwise circularly polarised (|CP 1 + |) mode, | B 1 + | inhomogeneity is an insurmountable obstacle. A scheme utilising the CP 1 + mode for the odd-numbered coil elements and the third-order clockwise CP mode for the even-numbered coil elements in the multiple-element Tx/Rx coil array was investigated with the objective of increasing the | B 1 + | homogeneity at 300 MHz. The results of an electromagnetic simulation and a 7 T MRI experiment are presented and to illustrate the improvements achieved using the optimum CP mode combination is discussed.
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