Abstract #3535

Theoretical and simulation verification of SNR enhancement in traveling wave MRI using free local resonators

Xinqiang Yan^1,2 and Xiaoliang Zhang³

¹Institute of Imaging Science, Vanderbilt University, Nashville, TN, United States, ²Radiology, Vanderbilt University, Nashville, TN, United States, ³Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, United States

Traveling wave MR is a promising method for large field-of-view imaging at ultrahigh fields. However, a major issue currently faced in traveling wave MR is low transmit efficiency and limited SNR. It was found that the SNR in traveling wave MRI can be significantly improved by using a free local resonator. In this study, we validated this finding in simulation and extended the single loop to a multi-channel array. Based on the simulation results, the SNR on the phantom has a 16-fold gain (56.8 VS 3.6) at near area and 3-fold gain at far area (9.7 VS 3.5) with the help of the free loop. This improvement can be attributed to the secondary magnetic field caused by induced current of the free resonator.

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