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Abstract #1699

A Fast MOSFET RF Switch for TRASE MRI at Low Magnetic Field

Pierre-Jean Nacher1, Sashika Kumaragamage2, Geneviève Tastevin1, and Christopher P Bidinosti3

1Laboratoire Kastler Brossel, ENS-PSL Research University, CNRS, UPMC-Sorbonne Université, Collège de France, Paris, France, 2Rady Faculty of Health Sciences, College of Medicine, University of Manitoba, Winnipeg, MB, Canada, 3Department of Physics, University of Winnipeg, Winnipeg, MB, Canada

TRansmit Array Spatial Encoding (TRASE) MRI uses trains of B1 pulses alternatively produced by distinct transmit coils. Commonly used coil switching involving PIN diodes is too slow for low-field MRI and would introduce wait times between pulses typically as long as each individual pulse (hence, significant diffusion-induced resolution loss in TRASE MRI of gas samples). A MOSFET-based RF switch is described and characterised. Up to 200 kHz, it allows for sub-µs switching of RF currents from a single amplifier to several coils with sufficient isolation ratio and no delay between pulses.

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