An X-ray imaging apparatus and method are provided. The X-ray imaging apparatus (100) according to an aspect includes an X-ray source (110) configured to radiate X-rays onto a subject region, an X-ray detector (120) configured to detect the radiated X-rays and obtain a plurality of frame images of the subject region, and an region-of-interest (ROI) filter (140), such as a collimator (141), located between the X-ray source (110) and the X-ray detector (120), configured to move toward the X-ray source (110) and the X-ray detector (120), and configured to filter the X-rays radiated from the X-ray source (110).The position and dimensions of the ROI collimator (141) can be dynamically adjusted when the region-of-interest contains an object-of-interest which needs to be tracked, like a surgical device moved inside a patient's body.
