Patent ID: 9050003
Filing Date: 2015-06-09
Classification: A61B,G06T

Abstract:
1. A reconstruction computing device comprising: dividing means configured to group pixels of an initial image, which is reconstructed on a basis of X-ray projection data obtained by scanning an object, into plural subsets; setting means configured to set reconstruction conditions including at least convergence conditions for each of the plural subsets divided by the dividing means; reconstruction means configured to update estimation images by performing iterative reconstruction under the reconstruction conditions set by the setting means for each of the plural subsets divided by the dividing means, and to fix estimation images or forward projection data of a subset in which the convergence conditions are satisfied, until other subsets satisfy the convergence conditions; and conversion means configured to convert fan beam projection data into parallel beam projection data when the X-ray projection data obtained by scanning the object is fan beam projection data, wherein, when performing forward projection processing, the reconstruction means re-projects a target image in the same beam path as for the parallel beam projection data.