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Abstract #4258

Adaptive RF Splitter for Ideal Current Patterns in Parallel Transmission and RF Shimming

Hao Liang1,2, Yijin Yang3, Ming Lu1,2, and Xinqiang Yan1,2,3
1Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, TN, United States, 2Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN, United States, 3Department of Electrical and Computer Engineering, Vanderbilt University, Nashville, TN, United States

Synopsis

Keywords: High-Field MRI, High-Field MRI, RF Arrays & Systems

Motivation: Traditional RF shimming and parallel transmission methods are limited by current patterns constrained by the basic coil shapes and the number of transmit coils, highlighting the need for new techniques.

Goal(s): A novel RF splitting network, namely adaptive RF splitter, that can deliver any desired RF signal to the coils despite the coil structure, geometry or coupling.

Approach: Utilized a novel architecture allowing for adaptive control of current ratios at the coil inputs to compensate for coil coupling.

Results: The adaptive RF splitter accurately optimizes current ratios, achieving maximal B1+ and SAR efficiencies in MRI coils.

Impact: A method that can directly control the current on the coil was proposed, even in cases of strong coupling between coils. This eliminates the need for specific Tx coil geometry, layout, or structure, and may enable superior pTx performance.

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