MRI MAGNETIC FIELD GENERATOR

摘要

An MRI magnetic field generator comprising a pair of pole pieces and an inclined magnetic field coil which is attached to the pair of the pole pieces. The adjustment of the magnetic field uniformity within the imaged field of view of a gap can be made safely and easily without removing the inclined magnetic field coil. After a holder disc (13) is put on a base disc (11) and fixed, magnetic material small pieces or permanent magnet small pieces for the adjustment of the magnetic field uniformity are inserted into the necessary positions of pits which are arranged in a predetermined pattern. Then spacers are inserted into the space between the holder disc (13) and a cover disc in the pits as necessary, positioned and fixed with screws to form a unified shim holder (10) which is aligned with the inclined magnetic field coil (6) or its support and fixed.