MAGNETIC RESONANCE IMAGING APPARATUS AND CHEMICAL-SHIFT PEAK DETECTION METHOD

An MRI apparatus according to one embodiment includes processing circuitry that obtains information about a contrast agent containing substances with different chemical shifts, and determines, based on the information, a frequency band related to decrease in a MR signal due to the chemical shifts; and sequence control circuitry that acquires, before contrast enhancement using the contrast agent, a first MR signal group in the frequency band by CEST imaging under different saturation pulse conditions, and acquires, after contrast enhancement using the contrast agent, a second MR signal group in the frequency band by CEST imaging under different saturation pulse conditions. The processing circuitry calculates a difference between a first Z-spectrum generated based on the first MR signal group and a second Z-spectrum generated based on the second MR signal group, and detects, from the difference, peaks indicating the decrease in the MR signal due to the chemical shifts of the substances.