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Abstract

In order to accurately measure a gradient magnetic field, a pre-encoding pulse P.sub.k is applied, data S(k, 1)-S(k, T) are collected from an FID signal while applying an encoding pulse G.sub.e having a gradient waveform to be measured, and the above steps are repeated K times with the magnitude of the pre-encoding pulse P.sub.k varied; data D(1,1)-D(1, T-1), D(2, 1)-D(2, T-1), . . . , D(K, 1)-D(K, T-1) having a phase difference .DELTA..phi. as an angle are obtained from the collected data S(1,1)-S(1, T), S(2, 1)-S(2, T), . . . , S(K, 1)-S(K, T); data having corresponding magnitudes of the encoding pulse G.sub.e are added to obtain added data d(1)-d(T-1); gradient magnetic field differences .DELTA.G(1)-.DELTA.G(T-1) are obtained from the added data d(1)-d(T-1); and the gradient magnetic field differences .DELTA.G(1)-.DELTA.G(T-1) are integrated to obtain a gradient magnetic field G(1)-G(T-1).

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