The present invention relates to a rotatable X ray detector. In order to improve clinical workflow an X ray detector arrangement (10) is provided that comprises an X ray detector unit (12) and a rotation unit (14). The X ray detector unit (12) comprises an X ray detector (16) with a plurality of X ray detecting elements arranged as a detector surface (18). The rotation unit(14) is configured to rotate the X ray detector about an axis (20) perpendicular to the detecting surface (18) at least at a point of intersection with the detector surface (18) upon receiving a rotation signal (22). Further the rotation signal (22) is dependently ruled by a collimator configuration of an X ray source arrangement for providing X ray radiation towards the X ray detector unit.
