Patent ID: 8576981

Claim:
An image reconstruction method for reconstructing a Computer Tomography (CT) image, said method comprising: acquiring projection data by a helical scan for performing each scan while relatively linearly moving an X-ray generator and detector system in a direction of a body axis of a subject, wherein the X-ray generator and detector system includes an X-ray tube for radiating X-rays and an X-ray detector having at least one detector row for detecting an X-ray transmitted through the subject; and obtaining image data of the CT image, using projection data lying in a view range including views each corresponding to a time at which a reconstruction plane of the CT image and a reference position of the X-ray generator and detector system coincide with each other in a body-axis direction, by performing a backprojection arithmetic operation including weighting based on a distance in the body-axis direction between the reconstruction plane and the reference position of the X-ray generator and detector system corresponding to the view for the projection data, wherein the weighting is performed based on a distance obtained by adding a predetermined value greater than zero to the distance, in place of the distance.