B0-field inhomogeneity caused by tissue-air interface has been a long standing challenge in high field(>=3T) cardiac MRI. Although high-order shimming methods has been proposed in recent publications using surface shimming coils, the shimming capability in deep tissue, such as the heart, is still limited due to the restrained current amplitudes and the geometry constraints of the receiving loops. In this study, we developed a cardiac high-order shimming coil based on a novel coil decoupling design to overcome the aforementioned limitations. We demonstrated the developed coil can successfully reduce B0 field variation by 50% in the whole-heart in healthy human volunteers.
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