CT imaging systems and methods thereof

摘要

CT imaging systems and methods thereof are disclosed. A common CT scanning is performed on an object to obtain a common CT imaging. An area of interest is determined from the image. A CT scanning is performed on the area of interest under a plurality of energy windows by a photon counter detector. A high resolution image of the area of interest is reconstructed. The discrimination of energy spectrum is higher and the result so obtained is more stable by using a photon counter detector to collect photon count projection data of a plurality of energy windows and thus it may be decomposed into a plurality of basis functions.

主权项

1. CT imaging system comprising
a X-ray source; a first detection and collection unit which is disposed to be opposite to the X-ray source and configured to perform a first CT scanning on an object to be detected to obtain scanning data; a reconstruction unit configured to reconstruct an image of a first resolution based on the scanning data; a second detection and collection unit which includes at least a photon counter detector and is configured to perform a second CT scanning on an area of interest in the image of the first resolution, the second CT scanning including scanning on the area of interest under a plurality of energy windows by the photon counter detector to obtain truncated energy spectrum data; wherein the reconstruction unit is further configured to supplement the truncated energy spectrum data by using the image of the first resolution as a priori image, and to reconstruct an image of a second resolution from the supplemented energy spectrum data, the second resolution being higher than the first resolution.