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Abstract #3533

Tuning Microstrip Coil Field Patterns Using Capacitor-Segmented Ground Planes

Xinqiang Yan1,2, John C. Gore1,2,3, and William A. Grissom1,2,3

1Institute of Imaging Science, Vanderbilt University, Nashville, TN, United States, 2Radiology, Vanderbilt University, Nashville, TN, United States, 3Biomedical Engineering, Vanderbilt University, Nashville, TN, United States

At 7T and higher, the B1 fields of loop and microstrip coils become asymmetric. However, B1 fields of dipole antennas are still symmetric. The different behaviors of dipole and microstrip coils may be explained by the fact that they have similar magnetic-field vectors but different Poynting vectors. We propose to manipulate the Poynting vector and thus the symmetry of the B1 patterns of microstrip coils using capacitor-segmented ground (CSG) planes. This concept has been validated by numerical studies and practical MRI experiments. The CSG method provides additional flexibility for manipulating the shape of the B1 field, which may be advantageous for RF shimming and parallel transmission.

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