Patent ID: 6809518
Filing Date: 2004-10-26
Classification: G01R

Abstract:
In an MRI system, a method for converting an adiabatic RF pulse into a pseudo adiabatic pulse having at least one step, said MRI system including a magnet for producing a magnetic field about a subject, gradient coils, RF coils, means for emitting an RF pulse and means for receiving RF waves, and means for analyzing said RF waves, said adiabatic RF pulse having at least one adiabatic half passage, said method comprising the steps of:setting the angle, time step and desired RF power for each time step within a pseudo adiabatic half passage in said means for emitting an RF pulse; replacing each half passage adiabatic pulse with at least one RF pulse of predetermined power which is adapted to provide a magnetic field vector at said angle from a main magnetic field.