Volume 127, April 2026, 110605Author links open overlay panel, , , , AbstractPurpose:

To model and predict the dynamics of conductive nonmagnetic objects moved within the MRI room under the influence of Lenz effect. High frequency motions, like vibrations induced by gradient eddy currents are not taken into account.

Methods:

The dynamics are described by an ordinary differential equation and the Lenz effect approximated under the assumption of negligible skin effect. This allows to separate the Lenz effect dependency on the object position and velocity, leading to a simple numerical procedure for objects of any shape.

Results:

The proposed model and numerical procedure were validated with experimental data recording the rotation of an aluminium plate falling inside a 1.5 T MRI scanner. The model was also applied for studying the translation of an aluminium plate pushed with constant force towards the MRI bore through the fringe field.

Conclusion:

The collected results showed that it is possible to obtain accurate predictions of motion in the presence of Lenz effect by neglecting the skin effect while determining the motional eddy currents induced in the metallic object.

Keywords

Dynamics

Implant

Lenz effects

Lorentz force

Static field

Data availabilityThe code developed to process the experimental data and to perform the dynamics simulations is provided as Python Jupyter notebooks at: https://doi.org/10.5281/zenodo.17151932. The notebooks also provide a short description of the task performed by each chunk of code.

© 2025 The Authors. Published by Elsevier Inc.