US 11,944,484 B2
Material decomposition calibration method and apparatus for a full size photon counting CT system
Xiaohui Zhan, Vernon Hills, IL (US); and Xiaofeng Niu, Vernon Hills, IL (US)
Assigned to CANON MEDICAL SYSTEMS CORPORATION, Otawara (JP)
Filed by CANON MEDICAL SYSTEMS CORPORATION, Otawara (JP)
Filed on Mar. 31, 2021, as Appl. No. 17/218,924.
Prior Publication US 2022/0313203 A1, Oct. 6, 2022
Int. Cl. A61B 6/00 (2006.01); A61B 6/03 (2006.01); A61B 6/42 (2024.01); A61B 6/58 (2024.01)
CPC A61B 6/583 (2013.01) [A61B 6/032 (2013.01); A61B 6/4241 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A calibration method, comprising:
placing a single slab of a single material in a field of view of an X-ray scanner system, wherein the slab has a known linear attenuation coefficient and a known pathlength;
scanning, with the X-ray scanner system, the slab with at least one X-ray tube located at plural known locations at different corresponding angles relative to the slab so as to scan the slab from the different corresponding angles;
repeating the placing and scanning steps for another single slab of the single material having a different thickness than the single slab,
generating material decomposition data based on the scannings at the different corresponding angles for the single slab and the another single slab;
generating air calibration data based on an air scan using the at least one X-ray tube at a rotation speed; and
calibrating a forward model for the X-ray scanner system based on the material decomposition data and the air calibration data.