Modern MR developments have allowed for systems which can easily vary the main magnetic field to leverage tissue properties at different field strengths. With this comes a change in the way that these systems handle safe elimination (quench) of main magnetic field in emergency situations. These quench dynamics at variable fields were investigated using a magnetic field probe at the isocenter in the bore of the magnet. The measured propagation dynamics show the need to ensure that the quench circuit used maintains an acceptable quench time, as quench times at the maximum field may not translate to lower field.
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