The programmed quench of a human 4T MR scanner was used to measure dB/dt inside the bore to evaluate cardiac stimulation risks during a quench. Additionally, we measured the exit temperature of the helium gas, to evaluate potential implications in quench pipe design. The maximum dB/dt was 360 mTs−1 at the center of the magnet, far below the cardiac stimulation threshold (20 Ts−1). Helium exit temperature reached 35°K, perhaps implying further considerations about quench pipe design and building. Replication of similar experiments on programmed quenches, specially in high-field MRI systems, will be useful to further characterize quench risks.
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