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Abstract #3284

Scalable Gradient Array Power Amplifier Design Using Digital Current Feedback

Ege Aydın1,2, Mehmet Emin Öztürk1,2, Manouchehr Takrimi2, and Ergin Atalar1,2,3
1Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, 2National Magnetic Resonance Research Center (UMRAM), Bilkent University, Ankara, Turkey, 3National Heart, Lung, and Blood Institute, National Institutes of Health (NIH), Bethesda, MD, United States

Synopsis

Keywords: Gradients, Gradients, Gradient Power Amplifier, Feedback, Gradient Array

Motivation: Gradient arrays offer substantial advantages over conventional gradient systems, but conventional power amplifiers lack scalability cost wise and space wise, limiting the practicality of gradient array.

Goal(s): To develop a scalable, high-bandwidth digital feedback gradient array controller using advanced ADC and GaN transistor technology to enhance the overall feasibility of gradient array systems.

Approach: We designed a 4-channel digital feedback controller in a standard Eurocard format, with the capability to scale horizontally.

Results: We introduce a scalable gradient array controller with digital feedback which successfully drives mutually coupled gradient coils, demonstrating its viability as a high-performance solution for gradient array systems.

Impact: Although the benefits of gradient arrays over conventional systems have been largely theoretical, our scalable, high-performance gradient array controller makes it possible to drive a large number of channels at a fraction of the cost.

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