Ultra-high field RF coils with adjustable longitudinal coverage: Traveling-wave meets standing-wave
Xinqiang Yan1,2, John C. Gore1,2,3, and William A. Grissom1,2,3
1Institute of Imaging Science, Vanderbilt University, Nashville, TN, United States, 2Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, United States, 3Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, United States
7T scanners currently are not equipped with body coils, so for MR imaging of relatively short coverage along the z-direction (head, knee and prostate), local transmit coils with standing-wave behavior are commonly used to achieve high efficiency. For MR imaging that requires long coverage such as the legs, traveling wave MRI is potentially a competitive choice since it is extremely simple to implement and enables large FOV imaging. In this study, we propose a coverage-adjustable transmit coil which combines the concepts of traveling-wave and standing-wave. The new design exhibits excellent efficiency over short regions, but maintains the ability to cover longer areas for MR imaging of the legs or whole body.
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