Filtering of oscillatory B0 behavior in NMR devices
AssigneeGeneral Electric Company
InventorsAnton M. Linz, Kevin F. King
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Abstract
The present invention, in one form, provides compensation for the effects of an oscillatory B0 eddy current Be(t) in an NMR apparatus. In an NMR apparatus having a transmitter generating a spin excitation signal and a receiver detecting an NMR signal, applied gradient signals are analyzed to estimate a resulting oscillatory B0 eddy current Be(t). The frequency of either the transmitter or the receiver of the NMR apparatus, or both, is shifted in frequency by an amount proportional to Be(t) to achieve compensation. The applied gradient signals are digitized and filtered using a recursive filter that is based upon an oscillatory model of the oscillatory B0 eddy current Be(t)
Claims18
A method for compensating for the effects of an oscillatory B0 eddy current in an NMR apparatus, the NMR apparatus comprising a transmitter generating a spin excitation signal and a receiver detecting an NMR signal, said method comprising the steps of:
- estimating an oscillatory B0 eddy current, Be(t), by analyzing at least one applied gradient signal;
- and
- shifting a frequency of at least one of the receiver and the transmitter by an amount proportional to Be(t).
A correction system for compensating for the effects of an oscillatory B0 eddy current in an NMR apparatus, the NMR apparatus including a transmitter generating a spin excitation signal and a receiver detecting an NMR signal, said correction system configured to:
- estimate an oscillatory B0 eddy current, Be(t), by analyzing at least one applied gradient signal;
- and
- shift a frequency of at least one of the receiver and the transmitter by an amount proportional to Be(t).
Dependencies are inferred from the claim text.