SYSTEMS AND METHODS FOR FOCAL SPOT MOTION DETECTION IN BOTH X- AND Y-DIRECTIONS AND CORRECTION

A method for estimating motion of an X-ray focal spot (84) is provided. The acts of the method include acquiring image data by causing X-rays to be emitted from the X-ray focal spot (84) of an X-ray source (12) toward a radiation detector (28) comprising multiple channels (88), wherein a subset of the channels (88) each have a collimator blade (86) positioned above the respective channel (88). The acts of the method also include independently estimating X-ray focal spot motion in an X-direction for the X-ray focal spot (84) relative to an isocenter of the radiation detector (28) and in a Y-direction along a direction of the X-rays for the X-ray focal spot (84) relative to the isocenter based on respective channel gains for a first channel (88) and a second channel (88) of the subset of the channels (88).