Toward shielding improvements in MRI gradients and other systems.
MAGMA
; 13(3): 186-92, 2002 Jan.
Article
em En
| MEDLINE
| ID: mdl-11755095
ABSTRACT
A new method is described for reducing the shielding-error function in the 'supershielding' approach to designing MRI systems. The method is thus shown to lead to significantly better shielding and better control of eddy current effects associated with gradient coils. To illustrate this technique, a set of results for a z-gradient coil is presented. A generalization to non-standard geometries can be made in a straightforward manner with the new method. The usefulness of the relationship of all fringe-field quantities to the shielding-error function is emphasized. The formal limit of perfect shielding in a 'least-squares' sense is shown for a simple strip-shield model along with a numerical eigenvalue study for comparison with the theoretical limit.
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Base de dados:
MEDLINE
Assunto principal:
Imageamento por Ressonância Magnética
Tipo de estudo:
Risk_factors_studies
Idioma:
En
Ano de publicação:
2002
Tipo de documento:
Article