Patent ID: 7218114

Claim:
A shimming method for an irregular object to be examined by magnetic resonant equipment, characterized by comprising the steps of: (1) measuring magnetic field parameters at measurement points located on a surface of an irregular object to be examined in magnetic resonance equipment; (2) based on the measured magnetic field parameters, calculating a calculated result selected from the group consisting of positions and number of shims for adjusting a shape of a homogeneous magnetic field volume in said magnetic resonance equipment and the homogeneity of the homogenous magnetic field volume when a passive shimming is to be performed, calculating a current value in a shimming coil for adjusting a shape of a homogenous magnetic field volume in said magnetic resonance equipment and the homogeneity of the homogenous magnetic field volume when an active shimming is to be performed, and calculating both said positions and number of shims and said current value in the shimming coil for adjusting a shape of a homogenous magnetic field volume in said magnetic resonance equipment and the homogeneity of the homogenous magnetic field volume when active shimming and passive shimming are to be performed together, and in each case performing said adjusting to give said shape of said homogeneous magnetic field volume at least one of a flat exterior bottom and a flat exterior top; (3) performing shimming according to said calculated result; and (4) repeating steps (1) to (3) until achieving a predetermined magnetic field homogeneity.