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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