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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Jan 24, 2006
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app pub date -
Oct 8, 2004
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 comprising: positioning an object in a static magnetic field; applying a radio frequency (RF) saturation pulse that spatially saturates nuclei of a slice of the object and applying an echo planar imaging (EPI) sequence to form an image of a slice of the object; generating a cross-field correction factor by analyzing the spatial distribution of the saturation line in the image.
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