The present invention relates to a C arm X ray imaging system. In order to provide C arm systems with an extended three dimensional field of view a C arm X ray imaging system (10) provided to acquire extended three dimensional images of an object is provided comprising a C arm structure (12) with an X ray source (14) and an X ray detector (16) mounted across from the X ray source a motorized drive (22) for a rotational movement of the C arm structure and a control unit (26). The C arm structure is provided to perform a rotational scan around an axis of rotation and around an ISO centre acquiring a number of X ray projections in order to generate image data for a reconstructed three dimensional field of view. The control unit is configured to control the motorized drive and to cause the rotational movement of the C arm structure to perform a first rotational X ray scan (50) around a first ISO centre (56) with a first axis of rotation for a first field of view and to perform at least a second rotational X ray scan (60) around a second ISO centre (62) with a second axis of rotation for a second field of view. The first and the second centre of rotation are displaced in relation to each other such that a connection line between the first and the second ISO centre is arranged transverse to the first and the second axis of rotation.
