Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2007-05-29
2007-05-29
Gutierrez, Diego (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
Reexamination Certificate
active
10564049
ABSTRACT:
The invention enables to monitor a magnetic field drift of a magnetic resonance imaging apparatus on the basis of the magnetic resonance signals, which are acquired during magnetic resonance image data acquisition, such as by single shot EPI or by a gradient echo sequence. The phases of at least two magnetic resonance signals are acquired an echo time after the corresponding RF excitations. This corresponds to the central k-space line, which has frequency encoding but no phase encoding. The difference of two consecutive phase measurements, which are acquired at a certain time interval provides the shift of the resonance frequency. This enables monitoring of the shift of the resonance frequency and compensation of the magnetic field drift.
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Zhao, X., et al.; B0-Bluctuation-Induced Temporal Variation in EPI Image Series Due to the Disturbance of Steady-State Free Precession; 2000; MRM;44:758-765.
Fay Sharpe Fagan Minnich & McKee LLP
Gutierrez Diego
Koninklijke Philips Electronics , N.V.
Vaughn Megann E
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