Patent ID: 6185447
Filing Date: 2001-02-06
Classification: A61B,G01R

Abstract:
A method of temporally resolved three dimensional dynamic magnetic resonance data acquisitions for an object with substantially cyclical motion comprising the steps of:a) placing the object in a static magnetic field;b) applying an RF excitation pulse followed by in-plane phase encode and slice direction phase encode gradients;c) detecting magnetic resonance signals in the presence of read-out gradients;d) repeating steps b) and c) for different values of slice direction phase encode gradients during a first cycle of motion of the object, while employing at least one amplitude of the in-plane phase encode gradient;e) repeating step d) for a time period greater than one minute over a plurality of motion cycles with other amplitudes of in-phase encode gradients;f) applying a phase encode rewinder gradient after each step of detecting magnetic resonance signals to reduce artifacts;g) applying crusher gradients before applying an RF excitation pulse to improve suppression of static tissue signals; andh) applying a contrast agent which alters the relaxation time of blood during the acquisition time to improve contrast in detected signals.