Patent ID: 6897653
Filing Date: 2005-05-24
Classification: G01R

Abstract:
1. A magnetic resonance imaging method comprising the steps of: a.) generating magnetic resonance signals, having signal amplitudes and phases, by: b.) generating temporary magnetic gradient fields, utilizing a plurality of gradient coils, by applying a temporary gradient pulse to said gradient coils to generate said temporary magnetic gradient fields; c.) superposing said temporary magnetic gradient fields on said uniform magnetic field to provide spatial encoding of the magnetic resonance signals being emitted; d.) receiving said spatially encoded magnetic resonance signals, utilizing a receiving coil; e.) correcting said signal amplitudes of said spatially encoded magnetic resonance signals, or quantities calculated from said spatially encoded signal amplitudes for deviations based on spatial non-linearities in the magnetic field strength of said temporary magnetic gradient fields, utilizing correction means, to produce corrected magnetic resonance signals, said step of correcting including calculating deviations of actual magnetic gradient field from an ideal gradient field using the geometrical shape of the gradient coils and the time profile of the temporary current pulse through the gradient coils; and f.) outputting said corrected magnetic resonance signals, utilizing output means, to form a magnetic resonance image.