Patent ID: 6362621
Filing Date: 2002-03-26
Classification: G01R

Abstract:
A gradient magnetic field measurement method comprising the steps of: when T is the number of times to sample data from one FID signal and K is a natural number equal to or greater than 2, applying an excitation RF pulse, applying a pre-encoding pulse Pk, collecting data S(k, 1)-S(k, T) from an FID signal while applying an encoding pulse Ge having a gradient waveform to be measured, and repeating these steps K times with the magnitude of said pre-encoding pulse Pk varied; obtaining data D(1, 1)-D(1, Tâˆ’1), D(2, 1)-D(2, Tâˆ’1), . . . , D(K, 1)-D(K, Tâˆ’1) having a phase difference &Dgr;&phgr; as an angle from said collected data S(1, 1)-S(1, T), S(2, 1)-S(2, T), . . . , S(K, 1)-S(K, T); adding data having corresponding magnitudes of said encoding pulse Ge to obtain added data d(1)-d(Tâˆ’1); obtaining gradient magnetic field differences &Dgr;G(1)-&Dgr;G(Tâˆ’1) from said added data d(1)-d(Tâˆ’1); and integrating said gradient magnetic field differences &Dgr;G(1)-&Dgr;G(Tâˆ’1) to obtain a gradient magnetic field G(1)-G(Tâˆ’1).