Magnetic Resonance Imaging (MRI) scanners use pulsed field gradients to form an image. A resistive gradient coil placed within a main magnet produces the field gradients.
Despite active shielding, the gradient coil still produces a stray field, which penetrates the cryostat of the magnet. Much of the cryostat is electrically conductive, so these pulsed (stray) fields induce additional time-varying magnetic fields within the imaging volume, which may lead to imaging artifacts.
There is a clear need for fast analysis tools for the problem of predicting the field variations that arise from gradient-coil induced eddy currents in the cryostat of an MRI scanner with axisymmetric geometry and to develop a high-fidelity benchmarking tool, which can be used for the validation stage in the manufacturing of MRI scanners.
