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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