Patent ID: 7186023

Claim:
A slice image and/or three-dimensional image creating method for creating images by using a radiographic apparatus that creates slice images and/or three dimensional images from projection images obtained by detecting an electromagnetic wave emitted to an object under examination, said apparatus including: irradiating means for emitting the electromagnetic wave in a diverging form to the object; planar detecting means opposed to said irradiating means across the object and having a plurality of pixels in an array arrangement for detecting the electromagnetic wave transmitted through the object; moving means for moving said irradiating means and said planar detecting means as interlocked to each other; and image creating means for obtaining projection images of the object by emitting the electromagnetic wave from different directions to the object by action of said moving means, and carrying out a reconstruction calculation of the projection images to create slice images and/or three-dimensional images of a selected site of the object; said method comprising, executed by said image creating means: a step of obtaining projection images of a calibration phantom serving as the object under examination and having at least three sets of markers, each set including two markers arranged in positions of point symmetry about an origin of coordinates, all said markers being arranged in different planes, and a cylindrical support member for holding said markers; a step of obtaining three-dimensional position information on said irradiating means and said planar detecting means relative to said calibration phantom based on the projection images of the calibration phantom and three-dimensional arrangement information on said markers inside the calibration phantom; and a step of carrying out the reconstruction calculation of the projection images to create the slice images and/or the three-dimensional images of the selected site of the object, the reconstruction calculation being based on the three-dimensional position information on said irradiating means and said planar detecting means.