Method for passively shimming an open magnet

Details Method for passively shimming an open magnet Method for passively shimming an open magnet

1995-01-17

1997-04-22

Teska, Kevin J.

Boots, shoes, and leggings

324319, 324320, 324307, 324322, 335298, 335301, 335297, 335216, G01V 300, H01F 300

Patent

active

056234309

ABSTRACT:
A method for passively shimming an open magnet having a magnetic field with an inhomogeneity including an amount of positive 2, 0 Legendre polynomial harmonics. The magnetic field is mapped and the amount of positive 2, 0 Legendre polynomial harmonics of the mapped magnetic field is determined. An adjusted magnetic field is defined equal to the mapped magnetic field minus a nonzero portion of the determined amount of positive 2, 0 Legendre polynomial harmonics. A computer shim code is run which calculates adding shims to reduce the inhomogeneity of the adjusted magnetic field. Shims are added to the open magnet as calculated from the running of the computer shim code.

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