Abstract #4071

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

Gabriela Gallego¹, Charlotte Sappo^1,2, Xinqiang Yan^2,3, and William A Grissom^1,2,3,4

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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