Miniaturized and Reproducible Phase Shifters using Capacitor-Loaded Transmission Lines for Add-On RF Shimming at High Field
Ming Lu1, Yue Zhu2,3, John Gore2,3,4, William A. Grissom2,3,4, and Xinqiang Yan2,3
1College of nuclear equipment and nuclear engineering, Yantai University, Yantai, China, 2Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, TN, United States, 3Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN, United States, 4Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, United States
Add-on RF shimming devices, including phase shifters, could provide additional degrees of freedom for RF transmit chains to improve field uniformity and reduce SAR. At the Larmor frequencies of MRI, however, the transmission line length for realizing large phase shifts becomes unrealistically long. We introduce a capacitor-loaded transmission line design to build a miniaturized microstrip line phase shifter for RF shimming at high fields. The fabricated phase shift boards had a miniaturized size of 3 x 4 cm2, exhibited a low loss of < 0.26 dB, and cost much less than those made from other materials.
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