초록 ▼

A method and apparatus are disclosed for reconstructing a 3D CT image of an object from incomplete x-ray cone beam projection data, additionally employing object boundary information from a separate optical scan. A 3D image of the object is reconstructed slice-by-slice by employing, for each slice,

A method and apparatus are disclosed for reconstructing a 3D CT image of an object from incomplete x-ray cone beam projection data, additionally employing object boundary information from a separate optical scan. A 3D image of the object is reconstructed slice-by-slice by employing, for each slice, a 2D reconstruction procedure for example, filtered backprojection, on the values of the 2D projection images in the plane of the slice to calculate a 2D image of the object for each of the slices.

대표청구항 ▼

A method for reconstructing a 3D image of an object from incomplete cone beam projection data, said method comprising: determining values representing planar integrals on a plurality of planes containing a reference axis in Radon space from the cone beam projection data; scanning the object to obtai

A method for reconstructing a 3D image of an object from incomplete cone beam projection data, said method comprising: determining values representing planar integrals on a plurality of planes containing a reference axis in Radon space from the cone beam projection data; scanning the object to obtain object boundary information for each of the plurality of planes containing the reference axis; on each of the planes in Radon space containing the reference axis, employing a 2D CT reconstruction procedure to calculate a 2D projection image of the object on the plane; iteratively correcting the 2D projection image on each of the planes in Radon space containing the reference axis by transforming the image back and forth between 2D projection image space and Radon space, correcting in 2D projection image space by a priori information on the object including the object boundary information for the plane, and correcting in Radon space by the planar integrals; and defining slices in planes perpendicular to the reference axis and reconstructing the 3D image of the object slice-by-slice by employing for each slice a 2D CT reconstruction procedure on the corrected 2D projection images in the plane of each slice to calculate a 2D image of the object for each of the slices.