Abstract #4290

Ultra-high field RF coils with adjustable longitudinal coverage: Traveling-wave meets standing-wave

Xinqiang Yan^1,2, John C. Gore^1,2,3, and William A. Grissom^1,2,3

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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