Oblon, McClelland, Maier & Neustadt, L.L.P.
Apparatus and method for hybrid pre-log and post-log iterative image reconstruction for computed tomography
A method and apparatus is provided to iteratively reconstruct a computed tomography (CT) image using a hybrid pre-log and post-log iterative reconstruction method. A pre-log formulation is applied to values of the projection data that are less than a threshold (e.g., X-ray intensities corresponding to high absorption trajectories). The pre-log formulation has better noise modeling and better image quality for reconstructed images, but is slow to converge. Projection data values above the threshold are processed using a post-log formulation, which has fast convergence but poorer noise handling. However, the poorer noise handling has little effect on high value projection data. Thus, the hybrid pre-log and post-log method provides improved image quality by more accurately modeling the noise of low count projection data, without sacrificing the fast convergence of the post-log method, which is applied to high-count projection data.
TOSHIBA MEDICAL SYSTEMS CORPORATION The Regents of the University of California
G A A G A A
G06T A61B A61B G06T A61B A61B
inventional inventional inventional additional inventional inventional
Jinyi Zhou Guobao Jian Wenli
Qi Yu Wang Zhou Wang