Method and apparatus for correcting by identifying the error image generated by the process is simplified cone beam projection data masked

摘要

What is described herein is a method and apparatus (3D) computer tomography for (CT) imaging 3-dimensional object, the image reconstruction process is applied to a plurality of sets of 2D cone-beam projection data in this case Each set is collected by the 2D detector on the scan path in the source location of a corresponding plurality. Mask is applied to each set of projection data in the image reconstruction processing a first step, the data within the boundary of the mask, a set of 2D data masked corresponding plurality is formed. Next, the data for each set of masked data can be processed along a line segment which is formed to a set of 2D data masked this, 2D estimate of the first data is formed. The line segment has end points as determined by the mask boundary where, 2D first estimate of the above is determined from a predetermined set of 2D cone-beam projection data. In the next step, the portion of the line segment should wanted is used for the first estimate of the data are identified, 2D correction data is formed for 2D estimate of the first data thereby that. The final step in the process of reconstructing an accurate 3D image of the object, and the first estimate of the data, the 2D correction data calculated for combination are combined.