Computer tomography imaging device and method

摘要

The present invention discloses a method for performing CT imaging on a region of interest of an object under examination, comprising: acquiring the CT projection data of the region of interest; acquiring the CT projection data of region B; selecting a group of PI line segments covering the region of interest, and calculating the reconstruction image value for each PI line segment in the group; and combining the reconstruction image values in all the PI line segments to obtain the image of the region of interest. The present invention further discloses a CT imaging device using this method and a data processor therein. Since the 2D/3D slice image of the region of interest can be exactly reconstructed and obtained as long as the X-ray beam covers the region of interest and the region B, it is possible to use a small-sized detector to perform CT imaging on the region of interest at any position of a large-sized object, which reduces to a great extent the radiation dose of the X-ray during the CT scanning.

主权项

1. A method of CT imaging a region of interest of an object under examination, comprising:
acquiring first CT projection data of the region of interest, wherein the region of interest is located within an object support with respect to the object, wherein the region of interest does not abut a perimeter of the object support, wherein the first CT projection data is acquired through a first CT scan, and wherein during the first CT scan the region of interest is adjusted into a scanning field of view such that an X-ray beam of the first CT scan only covers the region of interest; acquiring second CT projection data of region B, wherein at least a part of the region B is located outside the object support, and wherein the region B is separate from the region of interest and the region B is selected to enable the selection of a group of PI line segments covering the region of interest, and each PI line segment passing through the region of interest passes through the region B, wherein the second CT projection data is acquired through a second CT scan, and wherein during the second CT scan region B is adjusted into the scanning field of view such that an X-ray beam of the second CT scan only covers the region B; and reconstructing the CT 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.