MAGNETIC RESONANCE IMAGING COMPENSATED FOR VERY RAPID VARIATIONS IN STATIC MAGNETIC FIELD
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United States of America Patent
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Issued Date -
Dec 27, 2001
app pub date -
Mar 10, 1999
filing date -
Mar 10, 1999
priority date (Note) -
Abandoned
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Abstract
A magnetic resonance imaging method and apparatus gathers NMR image data over a sequence of measurement cycles. First magnetic gradient pulses are superimposed on a nominally static magnetic field to selectively address NMR RF excitations for at least one predetermined volume and second magnetic gradient pulses are superimposed on the static magnetic field at other times in a measurement cycle. At least one further of the measurement cycles is performed during which at least one of the second gradient pulses is omitted so as to produce calibration data representative of the magnetic field then existing in the predetermined volume. The calibration data is used to produce MRI data compensated for phase angle errors which otherwise would be present due to undesirable changes with respect to time in the magnetic field actually present in said predetermined volume. The MRI data is compensated for phase angle errors by applying to the measured image data the inverse of the phase angles determined during the at least one further of the measurement cycles.
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