Patent ID: 6150815
Filing Date: 2000-11-21
Classification: B82Y,G01R

Abstract:
A method of correcting for geometric distortion due to magnetic field inhomogeneity in magnetic resonance imaging (MRI), the method comprising the steps of:(a) simultaneously applying an RF pulse sequence and a slice selection gradient Gz pulse sequence;(b) simultaneously applying a frequency encoding/readout gradient Gx pulse sequence and a compensation gradient pulse sequence, said compensation gradient pulse sequence being applied in the same direction as the slice selection gradient Gz and having substantially the same amplitude as the slice selection gradient Gz that is applied during an initial RF excitation;(c) detecting magnetic resonance signals during the readout gradient Gx; and(d) repeating the steps (a) through (c), with the identical pulse sequences, except that both the slice selection gradient Gz and the compensation gradient are applied in the opposite direction.