Patent ID: 8606038

Claim:
A method, comprising: performing a spiral scan of an object, using a CT system with a gantry which is movable along a system axis, an axis of rotation of the gantry being inclined relative to the system axis during the spiral scan and the axis of rotation forming an acute angle to the system axis; reconstructing at least one CT image dataset from detector data collected during a finite advance along the system axis, wherein image artifacts arising from defective detector pixels may be present in the at least one CT image dataset; determining a geometric position of a line, in the reconstructed at least one CT image dataset, which connects points of intersection between the system axis and the axis of rotation during the performed scan; selecting at least two points in the at least one CT image dataset which are on the connecting line; and performing a removal of annular artifacts about each of the selected at least two points, wherein each of the at least two points are used as a center point of the annular artifacts to be removed.