Computer tomography imaging device and method

A CT imaging device for CT imaging a region of interest of an object under examination, comprising:

• an X-ray generator being configured to generate an X-ray beam for use in scanning;
• a detector arrangement being configured to detect the X-ray passing through a scanned region so as to produce projection data;
• a carrier of the object being configured to carry the object under examination in and out of the CT imaging device;
• a main controller being configured to control the operation of the CT imaging device, such that a first X-ray emitted in a first CT scan from the X-ray generator only covers the region of interest so as to obtain first CT projection data of the region of interest, and such that a second X-ray emitted in a second CT scan from the X-ray generator only covers the region B so as to obtain second CT projection data of the region B, wherein the region of interest is located within an object support with respect to the object, the region of interest does not abut a perimeter of the object support, the region B is located outside the object support, wherein the region B is selected to enable the selection of a group of PI line segments covering the region of interest, and wherein each PI line segment passing through the region of interest also passes through the region B;
• and
• a data processor being configured to reconstruct the image of the region of interest based on the first CT projection data of the region of interest acquired in the first CT scan and the second CT projection data of the region B acquired in the second CT scan.