An X-ray imaging apparatus includes an X-ray source configured to radiate X-rays to an object； an X-ray detector configured to detect X-rays radiated by the X-ray source； and a disk rotatably provided between the X-ray source and the X-ray detector, wherein region of interest (ROI) filters are configured to filter X-rays radiated by the X-ray source are mounted on the disk, the ROI filters having openings of different sizes.
