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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