Abstract: Systems and methods are presented for decreasing the processing time of spectral artifact reduction systems that use reprojection data for post reconstruction corrections. The systems and methods essentially reduce the data processed for the reprojection step to reduce the normally relatively long time period required by reprojectors. The time savings have no detrimental effect on image resolution. Thus, better quality pictures are obtained in shorter time periods.

Abstract: A method for the correction of ring artifacts in images obtained by rotate-rotate computerized tomography (CT) scanners includes the step of reconstructing an original image, which comprises a real image and a ring artifact image. The ring artifact image is determined by edge enhancing the original image and dividing the edge enhanced original image into rings or annuli with the annuli being concentric around the axis of rotation. The average intensity is determined for each concentric annulus. This average value of each annulus is substracted from pixels of the original image belonging to that annulus to provide a ring artifact free image.