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Abstract #1816

An on-coil current-source amplifier with integrated real-time optical monitoring of B1 amplitude and phase

Natalia Gudino 1 , Qi Duan 1 , Jacco A de Zwart 1 , Joe Murphy-Boesch 1 , Peter van Gelderen 1 , and Jeff H Duyn 1

1 Advanced MRI section, LFMI, NINDS, National Institutes of Health, Bethesda, Maryland, United States

Parallel transmission (pTX) is a critical technology to improve B1 uniformity and control RF power deposition at high field. Typically, optimization of the pTX excitation is based on prior information from electromagnetic field simulations and MRI. In this work we explored a way to support pTX by obtaining real-time B1 information from the RF current sensor integrated in an on-coil current-source amplifier with envelope feedback. This information was digitally encoded through low power analog-digital converters to be sent optically to a controller located outside the MRI room. Real-time analysis of these signals can be used for RF-safety monitoring and quality control.

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