| 摘要 |
PROBLEM TO BE SOLVED: To suppress cone beam artifact, etc., by filtering a projection data along a specific gradient direction corresponding to the focus locus and three- dimensionally reverse-projecting the projection data after filtering in a device with a plane detector to collect cone beam data. SOLUTION: A cone beam CT 10 has a rack 25 integrally and rotatably equipped with an X-ray tube 21 to irradiate a cone beam shape X-ray and a plane detector 23 placed facing the X-ray tube putting a subject in between. High voltage generated at a high voltage generator 19 under control by an X-ray controller 17 is fed to the X-ray tube. Projection data from multiple directions of a subject are obtained by a data collecting part 27 based on the output of the plane detector 23 and an image is reconstituted from the projection data at an image reconstituting part 31. The projection data are filtered along a specific gradient direction corresponding to the focus locus to three- dimensionally reverse-project the filtered projection data to obtain a reconstituted image. |
