Patent ID: 8284894

Claim:
A 3D tomosynthesis scanner apparatus comprising a rotary X-ray tube and a stationary X-ray detector diametrically oppositely arranged to the X-ray tube, said 3D tomosynthesis scanner apparatus being adapted for performing a rotational step-and-shoot image acquisition procedure for acquiring a set of 2D projection images during a continuous rotational movement of an X-ray tube in an azimuthal direction (+φ) along an arc segment of a circular trajectory when rotating around an object of interest (O) or a tissue region (M) to be examined and subjecting these 2D projection images to a 3D reconstruction procedure, wherein, during the image acquisition time for each 2D projection image, the electron beam focal spot on the rotary X-ray tube's anode is moved in an opposite direction (−φ) along the same arc segment from a start position (b s ) to an end position (b e ) with respect to the rotary X-ray tube's housing such that the azimuthal path distance (Δb) covered by the X-ray tube due to the continuous rotational tube movement during this time is compensated.