MRI apparatus

An MRI apparatus comprising processing circuitry configured to:

• continuously generate time-point data in increments of a predetermined time length;
• generate a series of gradient magnetic fields based on a predetermined pulse sequence in association with a series of first time-point data that are the generated time-point data and correspond to respective generation time points of the series of gradient magnetic fields;
• acquire an external trigger in association with trigger-time-point data that are the generated time-point data and correspond to an acquisition time point of the external trigger;
• estimate a value of an eddy magnetic field at a second time point by using the series of gradient magnetic fields and respective time differences between the series of first time-point data and second time-point data, wherein the respective time differences change depending on when the external trigger is acquired,
• the second time point being after the respective generation time points of the series of gradient magnetic fields, and
• the eddy magnetic field being resulting from the series of gradient magnetic fields;
• calculate a frequency variation or phase variation of an MR signal caused by the eddy magnetic field at the second time point from the estimated value of the eddy magnetic fields;
• and
• correct a frequency or phase of at least one of an RF transmitting signal to be applied to an object and the MR signal emitted from the object, by using the calculated frequency variation or the phase variation.