A METHOD OF MEASURING FIELD-GRADIENT MODULATION SHAPES - APPLICATION TO HIGH-SPEED NMR SPECTRSCOPIC IMAGING

A method is proposed for measuring waveforms of a time-varying field gradient used for high-speed NMR imaging. It utilizes a self-encoding gradient which calibrates the gradient modulation to be measured. Results are obtained in the form of a time integral of the gradient waveform, which can be used directly for Tropper's image reconstruction. Spectroscopic one-dimensional imaging experiments have been performed using rectangular and cosine gradient modulations. It has been demonstrated that, in both cases, significant improvement can be achieved by making use of actually measured gradient modulations for the reconstruction.