| 摘要 |
PROBLEM TO BE SOLVED: To provide an accurate image reconstitution method for CT for reconstituting the interested partial volume of a long object from the CT data of a conical beam or a pyramid beam under the use of a helical focus track. SOLUTION: By line integration over a detector, the reconstitution process of two stages for calculating the 3D radon value of the interested partial volume 11 determined only to the ϕ plane 16 of each time for the respective ϕ planes 16 of a 3D spherical coordinate system is fed. The interested partial volume 11 is bounded by the radius of a measurement field to an outer part to the respective ϕ planes 16 and is bounded by a curved plane generated by attaching a straight line vertical to the ϕ plane 16 belonging to the focus of each time to the respective focuses of a helical segment at an upper part and a lower part. |
