Patent ID: 8890525
Filing Date: 2014-11-18
Classification: G01R

Abstract:
1. A magnetic resonance imaging apparatus that performs EPI (echo planar imaging), the EPI including transmitting an excitation pulse to cause a nuclear magnetic resonance in an object in a static magnetic field, acquiring a plurality of echo signals generated by repeatedly inverting a polarity of a gradient magnetic field in a readout direction, and reconstructing image data on the object based on the plurality of echo signals, the magnetic resonance imaging apparatus comprising: a first acquisition unit that acquires, as first template data, the plurality of echo signals generated by performing an EPI echo signal acquisition sequence including application of a gradient magnetic field in a phase encoding direction as a prescan; a second acquisition unit that acquires, as second template data, the plurality of echo signals generated by performing an EPI echo signal acquisition sequence including application of a gradient magnetic field in the phase encoding direction after acquisition of the first template data as a prescan, so that start timing of application of the gradient magnetic field in the readout direction in acquisition of the second template data, is shifted from start timing of application of the gradient magnetic field in the readout direction in acquisition of the first template data; an imaging data acquisition unit that acquires the plurality of echo signals from the object by performing an EPT echo signal sequence as a main scan; and a correction unit that performs at least correction of phase error in the echo signals by using the first template data and the second template data in reconstruction of the image data from the plurality of echo signals acquired in the main scan by the imaging data acquisition unit.