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Abstract #3306

Three-Channel Modular Transmit Array for RF Gradient MRI: Enabling Low-Cost, Scalable RF Arrays Through Active Decoupling

N Reid Bolding1, Christopher Vaughn2, Aria Patel2, Snow Lin2, Jessie E.P. Sun3, William Grissom2, and Mark A Griswold1,2,3
1Physics, Case Western Reserve University, Cleveland, OH, United States, 2Biomedical Engineering, Case Western Reserve University, Cleveland, OH, United States, 3Radiology, Case Western Reserve University, Cleveland, OH, United States

Synopsis

Keywords: RF Arrays & Systems, RF Arrays & Systems, B0 Gradient Free MRI, Low-field MRI

Motivation: In order to realize the elimination of expensive B0 gradient hardware, new low-field imaging techniques demand a hardware redesign.

Goal(s): Build a compact and modular RF transmit system at a low price point, in order to enable the expansion of RF gradient imaging systems.

Approach: A previous design allowing for efficient and wireless operation of RF transmit in-field is modified with active channel decoupling to ease array expansion.

Results: A three channel array of low-cost transmitters with distributed synthesis capabilities and closed-loop amplitude control for active decoupling is presented, with a build cost under US$150 per channel.

Impact: Enabling high RF transmit channel count is essential for RF encoded imaging techniques like Selective Excitation through Nutation and Fingerprinting (SENF). Novel transmit system architecture presented here enables a reduction in system cost and easier array scaling while increasing portability.

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