Magnetic resonance imaging apparatus, image correction method, and static magnetic field inhomogeneity correction method

An image correction method for correcting for a static magnetic field inhomogeneity in a magnetic resonance imaging apparatus including a transmitting unit configured to irradiate a subject placed in a static magnetic field space, and a receiving unit configured to receive an echo signal generated from the subject by irradiation from the transmitting unit, the image correction method comprising:

• a step (a) of estimating, by calculating in advance of an imaging process based on a pulse sequence to be used for imaging and without preliminary measurement, and by using an application strength or an average application strength of a gradient magnetic field pulse according to the pulse sequence to be used for imaging, a static magnetic field inhomogeneity based on the pulse sequence;
• and
• a step (b) of executing control to apply, in advance of the imaging process based on the pulse sequence, a constant compensation magnetic field compensating for the static magnetic field inhomogeneity which is estimated in step (a) in advance of the imaging process and without preliminary measurement.

A static magnetic field inhomogeneity correction method for correcting for a static magnetic field inhomogeneity in a magnetic resonance imaging apparatus that includes a transmitting unit configured to irradiate a subject placed in a static magnetic field space, and a receiving unit configured to receive an echo signal generated from the subject by irradiation from the transmitting unit, the static magnetic field inhomogeneity correction method comprising:

• a step (a) of estimating, by calculating in advance of an image measurement process based on a pulse sequence to be used for imaging and without preliminary measurement, and by using an application strength or an average application strength of a gradient magnetic field pulse determined by the pulse sequence to be used for imaging, the static magnetic field inhomogeneity based on the pulse sequence;
• and
• a step (b) of executing control to apply, in advance of the image measurement process based on the pulse sequence, a constant compensation magnetic field compensating for the static magnetic field inhomogeneity which is estimated in step (a) in advance of the image measurement process and without preliminary measurement.