A method of quantifying the blood flow through a heart muscle is provided. A dynamic scan is performed on the subject to whom a magnetic resonance contrast agent is injected, and time-series data is obtained. The blood flow is calculated based on the data obtained in such a way that the dynamic state of the flow of the blood passing through the heart muscle is accurately reflected on the calculation result. The result is displayed with a numerical value or an image. The method of quantifying the blood flow through the heart muscle uses electrocardiographically gated first-pass MRI using an MRI contrast agent having a T1 reduction effect. In the method, a means for correcting a body movement, a means for setting a processing of a region of interest (ROI), a means for creating an input curve and an output curve using the signal strength varying depending on the variation with time of the concentration of the magnetic resonance imaging contrast agent, a means for performing signal strength saturation correction of the input curve, and a means for determining the slope (K1) of the linear portion of the Patlak plot obtained from the corrected input and output curves are provided.
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