Simulation of Magneto-Mechanical Coupling in a 3T Head-Only Magnet Design

Dominic M. Graziani¹, Seung-Kyun Lee¹, Jean-Baptiste Mathieu¹, Graeme C. McKinnon², Thomas K. Foo¹, John F. Schenck¹

We present an investigation on the effects of magneto-mechanical coupling on the eddy current in a prototype 3T head only scanner design. Transverse and longitudinal actively shielded gradient coils were modeled in COMSOL along with an aluminum cylinder, fixed at both ends, representing a conducting surface of the magnet. Magneto-mechanical resonance was observed for both gradient designs at frequencies between 2-3.5 kHz. At resonance, the peak gradient strength changed by up to ~10% for the longitudinal gradient and ~1.5% for the transverse gradient.