| 摘要 |
<P>PROBLEM TO BE SOLVED: To remove cone beam artifacts that can arise from a variety of causes, such as truncation of data in Z-direction (i.e., in the direction corresponding to the axis about which the X-ray source rotates about a patient), mishandled data, and/or missing frequencies in third generation cone beam computed tomography (CT), particularly in the case of axial (circular) scan trajectories. <P>SOLUTION: Algorithms are disclosed that recombine acquired data so as to generate a substantially uniform and complete set of frequency data where frequency data might otherwise be incomplete. This process, or its equivalent, may be accomplished in a computationally efficient manner using filtering steps in one or both of the reconstruction space and/or the post-processing space. <P>COPYRIGHT: (C)2013,JPO&INPIT |
