MAGNETIC RESONANCE IMAGING DEVICE

摘要

An MRI device has an imaging pulse sequence for measuring echo signals by applying 90° excitation pulse (21) and an inverting 180° high−frequency magnetic field pulse (22) a plurality of times. In performing this pulse sequence, prepulses (25−27) for keeping constant the gradient magnetic field error component entering during the immediately previous slice measurement before the application of the 90° excitation pulse (21) are applied a predetermined time before the application of the 90° excitation pulse (21). In this way, the fluctuation gradient magnetic field error component caused by the gradient magnetic field applied during the immediately previous slice measurement is made ineffective, and the residual gradient magnetic field component during the application of the 90° excitation pulse (21) is always kept uniform, thus making the spin phase rotation error caused later a constant error component that can be eliminated by later correction. Thus an MRI device by an imaging method using a pulse train by the CPMG method is provided from which the gradient magnetic field error component varying depending on the imaging condition and the influence of the spin phase error caused by the error component are eliminated and which creates an image for which the artifact due to the spin phase error is suppressed.