The present invention relates to an imaging apparatus and a corresponding imaging method. To avoid the disadvantages of a pile-up effect in the detection unit, an imaging apparatus is proposed comprising a radiation source (2) for emitting radiation from a focal region (20) through an imaging area (5), a detection unit (6) for detecting radiation from said imaging area (5), said detection unit comprising an anti-scatter grid (62) and a detector (61), a gantry (1) to which said radiation source (2) and said detection unit (6) are mounted and which allows rotation of said radiation source (2) and said detection unit (6) around said imaging area, and a controller (9) for controlling said detection unit (6) to detect radiation at a plurality of projection positions during rotation around said imaging area and for manipulating the position, setting and/or orientation of at least a part of said radiation source (2) and/or said detection unit (6) at first projection positions (80) so that the radiation incident on the detector (61) at said first projection positions is attenuated by anti-scatter grid (62) to a larger extent compared to second projection positions (80) representing the remaining projection positions.
