Patent ID: 6907100

Claim:
An X-ray CT system comprising: an X-ray source for radiating a cone-beam X-ray; a two-dimensional X-ray detector for detecting the X-ray radiated from the X-ray source through an object to be examined and for outputting projection data depending on an amount of the detected X-ray; scanning means configured to scan the object with the X-ray radiated from the X-ray source within a particular scan range predetermined spatially under a desired scan technique involving at least a movement of the X-ray source along a predetermined orbit for the scan, thus enabling the X-ray detector to acquire the projection data generated during the scan; a Radon data producing means for producing three-dimensional Radon data distributed three-dimensionally, from the projection data acquired by the scanning means; weighting means for weighting the three-dimensional Radon data using a weighting function providing a non-constant weight in which a degree of reliability of the projection data is reflected, the degree of reliability being previously determined depending on an acquisition time of the projection data during the scan along the orbit; and reconstruction means for reconstructing the three-dimensional Radon data weighted by the weighting means, based on a desired three-dimensional reconstruction algorithm, the reconstruction providing an image.