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

P.-J Nacher (1) , S Kumaragamage (2) , G. Tastevin (1) , C P Bidinosti (3)

1 LKB (Lhomond) - Laboratoire Kastler Brossel
2 Department of physics and astronomy [Winnipeg]
3 UWinnipeg - Department of Physics

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.

Domaines: Imagerie; Electronique

P.-J Nacher, S Kumaragamage, G. Tastevin, C P Bidinosti. A Fast MOSFET RF Switch for TRASE MRI at Low Magnetic Field. Joint annual meeting ISMRM-ESMRMB 2018, Proc. of the Intl. Soc. Mag. Reson. Med., Jun 2018, Paris, France. pp.1699. ⟨hal-02366385⟩