MAGNETIC RESONANCE IMAGING DEVICE

摘要

In diffusion-weighted imaging, the distortion amount and phase offset amount of k space data due to a poor magnetic field which is produced by an eddy current and vibration caused by the application of a diffusion-weighted gradient magnetic field pulse and which varies in terms of time are corrected with high accuracy to improve the image quality.  Characteristic data for correcting the distortion of the k space data is calculated for each position in a slice direction as the peak shift of projection resulting from the presence/absence of MPG pulse application.  The distortion amount and phase offset in each of the read-out direction and phase-encode direction of the slice surface are calculated as the characteristic data.