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High impedance RF coils, such as self-decoupled coils, reduce theelectromagnetic coupling between the coil elements and eliminates the use ofcomplex decoupling technologies. Although the high impedance design promisesexcellent decoupling between the coil elements, it also results in highelectric fields across the RF coil, leading to potential safety problems duringimaging. It also causes B1 field asymmetry, ultimately leading to difficultiesin imaging quantification. In this study, we propose and investigate using ahigh dielectric sheet to reduce the electric fields across the coil and achieveexcellent electromagnetic decoupling among the coil elements, thereby ensuringsafer MRI at ultra-high fields and maintaining high imaging performance.

High Dielectric Sheet to reduce Electric Fields and Flatten Magnetic Fields in Self-decoupled Radiofrequency coils for MR Imaging