Measurement and correction of gradient-induced cross-term magnetic fields in an EPI sequence
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United States of America Patent
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Dec 28, 2004
Grant Date -
Jul 22, 2004
app pub date -
Jan 22, 2003
filing date -
Jan 22, 2003
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Abstract
A method is disclosed for determining a gradient-induced cross-term magnetic field in a magnetic resonance imaging (MRI) system involving the steps of: positioning an object in a static magnetic field; applying a radio frequency (RF) excitation pulse that spatially selects a slice of the object; applying an incremented phase-encoding magnetic gradient field along a phase encoding gradient field direction parallel to the slice phase; applying a selective RF refocusing pulse to select a line in the slice; applying a switched readout magnetic gradient; which causes a cross-term magnetic field, generating a data array of a phase-encoding gradient and a corresponding sample data point along the selected line, and determining a center frequency distribution (CF) for the selected line, where the CFR is indicative of a gradient-induced cross-term magnetic field.
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