US 12,456,236 B2
Imaging systems and methods for extending truncated projection data
Kai Cui, Shanghai (CN); Yong E, Shanghai (CN); Jing Yan, Shanghai (CN); Na Zhang, Shanghai (CN); Le Yang, Shanghai (CN); Hanyu Wang, Shanghai (CN); Juan Feng, Shanghai (CN); Haihua Zhou, Shanghai (CN); Xuefei Lu, Shanghai (CN); Guanji Leng, Shanghai (CN); and Yang Hu, Shanghai (CN)
Assigned to SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD., Shanghai (CN)
Filed by SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD., Shanghai (CN)
Filed on Nov. 24, 2021, as Appl. No. 17/456,554.
Application 17/456,554 is a continuation of application No. PCT/CN2020/091968, filed on May 24, 2020.
Claims priority of application No. 201910439116.8 (CN), filed on May 24, 2019; application No. 201910824258.6 (CN), filed on Sep. 2, 2019; application No. 201910824827.7 (CN), filed on Sep. 2, 2019; and application No. 201911384031.0 (CN), filed on Dec. 28, 2019.
Prior Publication US 2022/0084172 A1, Mar. 17, 2022
Int. Cl. G06T 11/00 (2006.01)
CPC G06T 11/005 (2013.01) [G06T 2211/432 (2013.01); G06T 2211/441 (2023.08)] 13 Claims
OG exemplary drawing
 
1. An imaging system, comprising:
at least one storage device storing a set of instructions; and
at least one processor in communication with the at least one storage device, when executing the stored set of instructions, the at least one processor causes the system to perform operations including:
obtaining reference data including a complete projection of an object; wherein the reference data includes projection data acquired by scanning, from a non-truncated projection view, the object using a radiation device, in the non-truncated projection view, the object is within a field of view (FOV) of the radiation device, and the non-truncated projection view is determined by a first process including:
obtaining at least one second image of the object, the at least one second image being acquired by at least one camera at a plurality of candidate projection views, the at least one camera being positioned on a gantry of the radiation device, an FOV of the at least one camera being consistent with the FOV of the radiation device;
identifying, based on the at least one second image, one or more of the plurality of candidate projection views in which the object is completely within the FOV of the at least one camera; and
selecting, as the non-truncated projection view, one of the one or more of the plurality of candidate projection views;
obtaining original projection data of the object, the original projection data being acquired by scanning the object using the radiation device from one or more imaging projection views, the original projection data including truncation projection data that is acquired from at least one of the one or more imaging projection views, in each of the at least one of the one or more imaging projection views a truncation region of the object being located outside the FOV of the radiation device;
determining extended projection data corresponding to the at least one truncation region by performing, based on the original projection data and the reference data, a mirror extrapolation algorithm; and
generating a first image of the object based on the original projection data and the extended projection data.