1. A device (12) of a C-type frame for X-ray imaging, comprising: a C-type frame (32)； a movable support (34) of a C-type frame； an X-ray source (36)； an X-ray radiation detector (38), wherein the C-type frame comprises a first end (40) and a second end (42), wherein the X-ray source is mounted on the first end and the detector is installed on the second end； in this case, the C-type frame is mounted on the support of the C-type frame, so that the x-ray source and detector are able to move around the test object (44) along the corresponding paths (46) of the source and detector, which are two-axis rotation trajectories built on simultaneous screw motion and the movement of the roll of the C-type frame； the X-ray source contains at least a first focal point (48) and a second focal point (50), spaced apart from each other by a distance (52) between the focal points in the direction (54) of the displacement, while the direction of the displacement coincides with the path of the source. 2. The C-type frame device according to claim 1, wherein the first and second focal points are located on the path of the x-ray source. 3. The device of the C-type frame according to claim 1 or 2, in which the offset distance and / or the direction of the offset can be adjusted. 4. The C-type frame device according to claim 1, wherein the x-ray source is provided in the form of a single stereoscopic x-ray tube having two focal points. The C-type frame device according to claim 1, wherein the x-ray source is provided in the form of an x-ray tube with two energy levels. An X-ray imaging system (10) comprising: a device1. Устройство (12) рамы C-типа для рентгеновской визуализации, содержащее:раму (32) C-типа；подвижную опору (34) рамы C-типа；источник (36) рентгеновского излучения； идетектор (38) рентгеновского излучения；при этом рама C-типа содержит первый конец (40) и второй конец (42), при этом источник рентгеновского излучения установлен на первом конце, а детектор установлен на втором ко
