X-RAY CT DEVICE AND IMAGE RECONSTRUCTION METHOD

摘要

To generate a reconstructed image which is suited to characteristics of a site (especially a bilaterally symmetric site) and with which an appropriate image diagnosis is possible, a computation device (202): computes a back projection phase width (F1) at a rotational center (S102); computes a distance (R1) between the rotational center location which is a reference location and a pixel to be reconstructed (S103); according to the distance (R1) between the rotational center location and the pixel to be reconstructed, sets a function (f1) which changes the back projection phase width (S104); computes a back projection phase width (F2) in the pixel to be reconstructed, substituting a value of the distance (R1) between the rotational center location which is the reference location and a pixel to be reconstructed in the function (f1) which changes the back projection phase width (S105); computes a view weighting, on the basis of the back projection phase width (F2) in the post-correction pixel to be reconstructed and a slope width (gamma) of a view weighting function (S106); and reconstructs a CT image, using the view weighting (S107).