Method for the correction of artifacts in magnetic resonance images
AssigneeSiemens Aktiengesellschaft
InventorsKarsten Wicklow, Oliver Heid
Life of this patent
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Abstract
In a method for correcting artifacts in magnetic resonance images that are caused, in a magnetic resonance device, by transverse magnetic field components that are oriented transverse to a basic magnetic field of the magnetic resonance device, wherein the magnetic resonance device has a gradient coil system for generating magnetic gradient fields and a high frequency transmitter for exciting magnetic resonance signals, during a measurement sequence a frequency correction value is fed to the high frequency transmitter for a correction area, this frequency correction value being determined dependent on the transverse magnetic field components, and/or an additional gradient field is produced for compensating the transverse magnetic field components.
Claims8
A method for correcting artifacts in magnetic resonance images, said artifacts being caused in a magnetic resonance device by system-related transverse magnetic field components that are oriented transverse to a basic magnetic field of the magnetic resonance device, said magnetic resonance device having a gradient coil system for generating magnetic gradient fields and a high frequency transmitter which emit radiated signals, having a frequency, for exciting magnetic resonance signals, comprising the steps of:
- determining a frequency correction Δω dependent on the system-related transverse magnetic filed components;
- during a measurement sequence for a correction area, emitting transmitter-radiated signals, having a frequency from said high-frequency transmitter and thereby exciting nuclear magnetic resonance signals;
- supplying said frequency correction value Δω to the high frequency transmitter which alters the frequency of said transmitter-radiated signals by said correction value Δω independent of said nuclear magnetic resonance signals.
Dependencies are inferred from the claim text.