Patent ID: 6470203
Filing Date: 2002-10-22
Classification: G01R

Abstract:
A phase error detection method, comprising the steps of:(a) applying a pre-pulse to an arbitrary gradient axis, transmitting an excitation pulse, transmitting a first inversion pulse, subsequently transmitting a second inversion pulse, applying a dephaser pulse to a phase axis, collecting data from echoes while applying a read pulse to said phase axis, applying a rephaser pulse, subsequently transmitting a third inversion pulse, applying a dephaser pulse to said phase axis, collecting data from echoes while applying a read pulse to said phase axis, and determining amount of phase error based on collected data; (b) applying a pre-pulse to an arbitrary gradient axis, transmitting an excitation pulse, transmitting a first inversion pulse, applying a phase encoding pulse to a phase axis, applying a rewind pulse to said phase axis, subsequently transmitting a second inversion pulse, applying a dephaser pulse to said phase axis, collecting data from echoes while applying a read pulse to said phase axis, applying a rephaser pulse, subsequently transmitting a third inversion pulse, applying a dephaser pulse to said phase axis, collecting data from echoes while applying a read pulse to said phase axis, and determining amount of phase error based on collected data; (c) applying a pre-pulse to an arbitrary gradient axis, transmitting an excitation pulse, transmitting a first inversion pulse, applying a phase encoding pulse opposite in polarity to said step (b) to a phase axis, applying a rewind pulse to said phase axis, subsequently transmitting a second inversion pulse, applying a de-phaser pulse to said phase axis, collecting data from echoes while applying a read pulse to said phase axis, applying a rephaser pulse, subsequently transmitting a third inversion pulse, applying a dephaser pulse to said phase axis, collecting data from echoes while applying a read pulse to said phase axis, and determining amount of phase error based on collected data; (d) applying a pre-pulse opposite in polarity to said step (a) to an arbitrary gradient axis, transmitting an excitation pulse, transmitting a first inversion pulse, subsequently transmitting a second inversion pulse, applying a dephaser pulse to a phase axis, collecting data from echoes while applying a read pulse to said phase axis, applying a rephaser pulse, subsequently transmitting a third inversion pulse, applying a dephaser pulse to said phase axis, collecting data from echoes while applying a read pulse to said phase axis, and determining amount of phase error based on collected data; and (e) determining amount of phase error caused by said pre-pulse based on amount to phase error obtained from each of above steps (a) to (d).