1. A magnetic resonance imaging (MRI) apparatus comprising: at least one hardware processor implementing: a data acquisition unit configured to acquire a first image, based on an MRI scan on an object; and an image acquisition unit configured to: acquire a second image by performing de-noising filtering on the first image in a spatial domain; acquire a third image, based on the first image and the second image; convert the third image from the spatial domain into a frequency domain; acquire a fourth image by performing low-pass filtering on the third image converted into the frequency domain; convert the fourth image from the frequency domain into the spatial domain; and acquire a final image, based on the second image and the fourth image converted into the spatial domain.