The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 2019
Filed:
Apr. 27, 2016
Toshiba Medical Systems Corporation, Otawara-shi, JP;
The Regents of the University of California, Oakland, CA (US);
Jinyi Qi, Davis, CA (US);
Guobao Wang, Woodland, CA (US);
Wenli Wang, Briarcliff Manor, NY (US);
Jian Zhou, Buffalo Grove, IL (US);
Zhou Yu, Wilmette, IL (US);
TOSHIBA MEDICAL SYSTEMS CORPORATION, Otawara-shi, JP;
The Regents of the University of California, Oakland, CA (US);
Abstract
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.