Abstract #4291

Improved traveling wave efficiency in 7T human MRI using wireless local loop and dipole arrays

Xinqiang Yan^1,2, Xiaoliang Zhang^3,4, John C. Gore^1,2,5, and William A. Grissom^1,2,5

¹Institute of Imaging Science, Vanderbilt University, Nashville, TN, United States, ²Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, United States, ³Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, United States, ⁴UCSF/UC Berkeley Joint Graduate Group in Bioengineering, San Francisco, CA, United States, ⁵Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, United States

Traveling-wave MRI has robust matching performance and capability for large field-of-view (FOV) imaging. However, the efficiency of traveling-wave MRI is much lower than conventional methods, which limits its application. One way to improve the efficiency is to place local wireless resonators around the subject. The feasibility of this approach has been demonstrated in previous works using a single small loop. However, it is not clear whether other kinds of coils (such as electric dipoles) can be used as local elements, and it is not clear how much the improvements can be maintained in human imaging using an array design. By using wireless local loop coil and transverse dipole arrays, the transmit efficiency (B₁⁺) of traveling-wave MRI can be improved by 3.4-fold in the brain and 2-fold in the knee. The coil types (loops or dipoles) should be carefully chosen for brain or knee imaging to maximize the improvement since they exhibit different types of coupling to the TE₁₁ mode, and the enhancement depends on the local body configuration

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