Magnetic resonance imager mobile van magnetic field homogeneity shift compensation

摘要

In the installation of a superconducting magnet (10) for magnetic resonance imaging at a preselected position in a mobile van (30), preselected curvilinear magnetic segments (42,44,46) are applied to preselected locations on the exterior of the magnet to counteract magnet inhomogeneities in the imaging bore (12) which would otherwise occur because of magnetic material (34,36) in the van structure.