| 摘要 |
PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus which suppresses cone beam artifacts. SOLUTION: The X-ray CT apparatus (100) includes a scanning means (20 and 23), a scanning control means (30U), and an image reconstructing means (30V) which reconstructs a tomographic image of a subject on the basis of projection data within a rotation angle range of an X-ray tube less than 360 degree. The scanning control means (30U) controls scanning by distributing rotation angle positions evenly within a range of 360 degree, irradiating the subject with X-ray from a plurality of rotation angle ranges of the X-ray tube less than 360 degree, and collecting a plurality of groups of projection data from a same position in the body axial direction of the subject. The image reconstructing means (30V) reconstructs a plurality of tomographic images using the plurality of groups of projection data, extracts a partial image from each tomographic image on the basis of the rotation angle position from where the group of projection data used for reconstructing the tomographic image is collected, and forms a tomographic image of the position of the subject by composing the plurality of extracted partial images. COPYRIGHT: (C)2011,JPO&INPIT |
