Patent ID: 7418286

Claim:
A magnetic resonance imaging apparatus varying a phase encoding amount and alternating positive and negative of a readout gradient magnetic field pulse in measurement, comprising: signal acquisition means for executing a first sequence to acquire a plurality of echo signals by, after radiating a radio-frequency magnetic field pulse to an object to be examined, applying phase encoding and repeatedly applying a readout gradient magnetic field while alternating its polarity, and for executing a second sequence to acquire a plurality of echo signals by, after radiating a radio-frequency pulse to the object, applying phase encoding and repeatedly applying a readout gradient magnetic field while its polarity is alternated oppositely to that in the first sequence at the same phase encoding amount as the first sequence; transform means for performing Fourier transform in readout direction of both (i) the echo signals obtained by applying the first sequence and (ii) the echo signals obtained by applying the second sequence; complex addition means for performing complex addition of the Fourier transformed echo signals of the same phase encoding amount respectively obtained in the first sequence and the second sequence, to obtain complexly added data; and image reconstruction means for performing image reconstruction by Fourier transform in phase encoding direction of the complexly added data.