C-ARM SYSTEM WITH EXTENDED FIELD OF VIEW

摘要

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.

主权项

1. A C-arm X-ray imaging system (10), provided to acquire extended three-dimensional images of an object, 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); wherein 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; wherein the control unit is configured to control the motorized drive; and wherein the control unit is configured 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 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; wherein the first and the second ISO-centre 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; and wherein the control unit is configured to provide a convex hull (70) as an extended three-dimensional field of view enclosing the first field of view and the second field of view and residual regions (72), which residual regions are located inside the convex hull, but outside the first and second fields of view.