PURPOSE: To provide a magnetic resonance image in which artifacts caused by the alternate polarities of a reading gradient magnetic field are suppressed by correcting phase errors, which are caused by the alternation of the reading gradient magnetic field polarities, by obtaining sets of reference measurements of both polarities at low values in a phase encoding direction. CONSTITUTION: An RF pulse is applied by a magnetic resonance device 1, for the purpose of exciting dipole moment in at least a portion of the body, to produce a plurality of magnetic resonance signals. In a control system 12 at this time, in order to measure a first set of samples of the magnetic resonance signals, a plurality of reading gradient magnetic field pulses having alternate positive and negative polarities are switched to measure a second set of signal samples at both of the polarities of a reading gradient magnetic field. A set of phase errors is determined from the second set, and an image is formed from the first set of signal samples through corrections to the phase errors. The second set reads that the signal samples are located on a line within a two-dimensional auxiliary region inside a (k) space and adjoin a line inside the (k) space.
CORRECTING METHOD FOR READ GRADIENT MAGNETIC FLUX POLARITY IN EPI AND GRASE MRI