storing at least one of (a) a transmitting phase of a transmitted exciting pulse, (b) a transmitting phase of a refocusing pulse, (c) a shift amount of the relative phase difference between the transmitted exciting phase and the refocusing pulse, and (d) an intensity of a gradient pulse in a readout direction so as to be associated with at least one of an imaging condition and a blood flow velocity;

determining, on the basis of the at least one of (a) the transmitting phase of the transmitted exciting pulse, (b) the transmitting phase of the refocusing pulse, (c) the shift amount, and (d) the intensity of the gradient pulse that are stored in the storage unit, the at least one of (a) the transmitting phase of the transmitted exciting pulse, (b) the transmitting phase of the refocusing pulse, (c) the shift amount of the relative phase difference between the transmitted exciting phase and the refocusing pulse, and (d) the intensity of the gradient pulse in the readout direction corresponding to the blood flow velocity of the object as an imaging condition such that (i) intensities of magnetic resonance signals generated from a vein in a diastole and a systole of the cardiac muscle of the objects are equal to each other and (ii) the difference between intensities of magnetic resonance signals generated from an artery in a diastole and a systole of the cardiac muscle of the objects increases;

performing a three-dimensional imaging scan for obtaining a multi-phase MRA image by synchronizing a signal representing a heart phase collected by a time phase detecting unit on the basis of the determined imaging condition; and

acquiring a differential image by differentiating the multi-phase MRA image obtained by the three-dimensional imaging scan.