TY - PAT AB - A magnet arrangement for producing a magnet field in a gap (3) between a pair of pole pieces (1), e.g. to provide the main magnetic field for application to a subject for magnetic resonance imaging, wherein adjacent the pole pieces the magnet core 15 has sections 17 of restricted cross-sectional area which serve to improve the homogeneity of the field in the gap. AU - McGinley,JVM PY - 1989/// TI - Magnet Arrangements ER -