METHOD FOR CORRECTING CT IMAGE DISTORTION PHOTOGRAPHED BY CONE BEAM CT APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a method for obtaining an accurately reproduced three-dimensional image of an object by correcting shape distortion of a CT image inevitably caused by a reconstruction computing based on the Feldkamp method applied in a cone beam CT apparatus.;SOLUTION: The shape distortion of the CT image is eliminated by conducting CT photography of a phantom with a known shape, analyzing the difference between the obtained CT image and the actual shape of the phantom, carrying out three-dimensional coordinate transformation of pixel data constituting the CT image so that the CT image corresponds with the actual shape of the phantom and carrying out three-dimensional coordinate transformation of the pixel data of the CT image of the object using the coordinate transformation method.;COPYRIGHT: (C)2004,JPO&NCIPI