BigPatents India

The present invention aims to provide an image reconstructing method which obtains an image good in quality where a helical scan with a scan surface being tiled is performed using a cone beam. A tilt correcting process for correcting variations every views, in positions of respective channels of detector sequences with respect to a linear travel axis due to the inclination of the scan surface is effected on projection data D0. Data D1 plane-projected onto a projection plane are determined on the basis of the tilt-corrected projection data D0 (R1). Next, the plane-projected data D1 are projected, in an X-ray penetration direction, onto respective pixels constituting a plurality of lines which are placed on a reconstruction area with plural pixel intervals defined there among and extend in the direction parallel to the projection plane to thereby determine back projected pixel data D2 of respective pixels constituting the lines on the reconstruction area. Further, interpolation is applied among the plurality of lines to determine back projected pixel data D2 of respective pixels among the lines on the reconstruction area (R2). The back projected pixel data D2 of all views used in image reconstruction are added together in association with the pixels(R3).