Method of monitoring a magnetic field drift of a magnetic resonance imaging apparatus
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United States of America Patent
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May 29, 2007
Grant Date -
Jul 27, 2006
app pub date -
Jul 2, 2004
filing date -
Jul 7, 2003
priority date (Note) -
Expired
status (Latency Note)
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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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