Patent ID: 7589531
Filing Date: 2009-09-15
Classification: G01R

Abstract:
1. A gradient magnetic field coil unit comprising: a main coil layer that has a main coil for generating a gradient magnetic field and is formed in a substantially cylindrical shape; a shield coil layer that is attached to the outside of the main coil layer and has a shield coil for generating a magnetic field which shields a leakage magnetic field from the main coil; and a cooling layer arranged between the main coil layer and the shield coil layer and including a plurality of refrigerant flow paths extending parallel to an axis of the main coil layer; and a plurality of shim trays for receiving passive shims, the shim trays being included in the cooling layer, extended parallel to the axis of the main coil layer, and interposed between a corresponding pair of adjacent ones of the refrigerant flow paths.