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Abstract #4071

Compact and Reproducible Microstrip Power Splitters for Array-Compressed Parallel Transmission at 7T

Gabriela Gallego1, Charlotte Sappo1,2, Xinqiang Yan2,3, and William A Grissom1,2,3,4
1Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, United States, 2Vanderbilt University Institute of Imaging Science, Nashville, TN, United States, 3Department of Radiology, Vanderbilt University, Nashville, TN, United States, 4Department of Radiology, Vanderbilt University Institute of Imaging Science, Nashville, TN, United States

Parallel transmission (pTx) with an array of radiofrequency (RF) coils enables spatially uniform excitation with lower SAR in high-field MRI. Performance improves with the number of coils. Currently, 7T scanners have a limited number of transmit channels due to their high cost and complexity. Array-compressed pTx (acpTx) networks comprise unequal power splitters that sit between the transmit amplifiers and coils, enabling a small number of channels to optimally drive a large number of coils. This study presents the design of low-loss unequal power splitter building blocks with minimal size that can be combined in stages for a variety of applications.

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