公开(公告)号：US20150030225A1

公开(公告)日：2015-01-29

申请号：US14337209

申请日：2014-07-22

Applicant: TSINGHUA UNIVERSITY ,  NUCTECH COMPANY LIMITED

Inventor： Yuxiang XING ,  Le SHEN ,  Li ZHANG ,  Zhiqiang CHEN ,  Liang LI

IPC: G06T11/00 ,  G06T5/00 ,  G01N23/04

CPC classification number: G01N23/046 ,  G06T11/006 ,  G06T2207/10081 ,  G06T2207/20182 ,  G06T2207/30004 ,  G06T2211/408 ,  G06T2211/424

Abstract: The present disclosure relates to a self-prior information based X-ray dual-energy CT reconstruction method, which can utilize information inherent in data to provide a prior model, thereby obtaining a reconstructed image with a high quality. The X-ray dual-energy CT reconstruction method according to the present disclosure comprises: (a) rating an energy spectrum and establishing a dual-energy lookup table; (b) collecting high-energy data pH and low-energy data pL of a dual-energy CT imaging system using a detector of the dual-energy CT imaging system; (c) obtaining projection images R1 and R2 of scaled images r1 and r2 according to the obtained high-energy data pH and low-energy data pL; (d) reconstructing the scaled image r2 using a first piece-wise smooth constraint condition and thereby obtaining an electron density image; and (e) reconstructing the scaled image r1 using a second piece-wise smooth constraint condition and thereby obtaining an equivalent atomic number image. In the present disclosure, the noise in the dual-energy reconstructed image can be effectively prohibited while keeping the resolution by effectively using information inherent in data.

Abstract translation: 本公开涉及一种基于自我先验信息的X射线双能CT重建方法，其可以利用数据中固有的信息来提供先验模型，从而获得具有高质量的重建图像。 根据本公开的X射线双能CT重建方法包括：（a）评估能谱并建立双能量查找表; （b）使用双能CT成像系统的检测器收集双能CT成像系统的高能数据pH和低能量数据pL; （c）根据获得的高能量数据pH和低能量数据pL，获得缩放图像r1和r2的投影图像R1和R2; （d）使用第一分段平滑约束条件重建缩放图像r2，从而获得电子密度图像; 和（e）使用第二分段平滑约束条件重建缩放图像r1，从而获得等效的原子序数图像。 在本公开中，可以有效地禁止双能量重构图像中的噪声，同时通过有效地使用数据中固有的信息来保持分辨率。

公开(公告)号：US20250095240A1

公开(公告)日：2025-03-20

申请号：US18570387

申请日：2023-08-31

Applicant: NUCTECH COMPANY LIMITED ,  TSINGHUA UNIVERSITY

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Hu TANG ,  Yunda SUN ,  Xin JIN ,  Zhenhua ZHAO ,  Le SHEN

IPC: G06T11/00 ,  A61B6/00 ,  G06T5/50 ,  G06T7/11

Abstract: A static CT apparatus and an imaging method for the same are provided. The imaging method includes: acquiring initial projection data of an inspected object at different angles by using a distributed ray source and a detector, where the initial projection data includes projection data that is directly obtained by the detector based on the rays emitted from a plurality of ray source points; obtaining a first CT image using a reconstruction algorithm according to the acquired initial projection data; dividing the first CT image into N first sub-images, where N is a positive integer greater than or equal to 1, and a union of the N first sub-images covers the entire first CT image; optimizing the N first sub-images to obtain N second sub-images; and merging the N second sub-images to obtain a second CT image.

公开(公告)号：US20230144259A1

公开(公告)日：2023-05-11

申请号：US18052671

申请日：2022-11-04

Applicant: Nuctech Company Limited ,  Tsinghua University

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Yunda SUN ,  Zhenhua ZHAO ,  Xin JIN ,  Le SHEN ,  Wuyang LIANG

IPC: G01N23/046 ,  G06T11/00 ,  G01N23/083

CPC classification number: G01N23/046 ,  G06T11/005 ,  G01N23/083 ,  G01N2223/643 ,  G01N2223/04 ,  G01N2223/419

Abstract: The method includes: receiving an encoder signal and a ray machine output beam signal, and initially synchronizing the encoder signal and the ray machine output beam signal; recording coded value M of the encoder at moment tm, and coded value N of the encoder at moment tm+1, where M, N, and m are integers; determining that duration from the moment tm to the moment tm+1 is an actual output beam time interval T of the ray machine, when it is determined that a difference value between the coded value M and the coded value N satisfies preset value a, a being an integer; determining gap time TG in the actual output beam time interval T based on a preset output beam time interval TJ of the imaging system and the actual output beam time interval T; and controlling the ray machine not to emit beam within the gap time TG.

公开(公告)号：US20150185355A1

公开(公告)日：2015-07-02

申请号：US14576737

申请日：2014-12-19

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Li ZHANG ,  Zhiqiang CHEN ,  Qingping HUANG ,  Xin JIN ,  Yunda SUN ,  Le SHEN ,  Ji ZHAO

IPC: G01V5/00 ,  G01T7/08 ,  G01N23/04 ,  G06T11/00

CPC classification number: G01V5/005 ,  G01N23/046 ,  G01T7/08 ,  G06T11/003 ,  G06T2207/10072 ,  G06T2211/40

Abstract: A CT system and method thereof are discloses. The system includes: a conveyor mechanism; a first scanning stage configured to scan the object and generate a first digital signal; a second scanning stage spaced from the first scanning stage at a preset distance in a direction of the object's movement; a processing device configured to reconstruct a CT image of the object at a first image quality based on the first digital signal, and analyze the CT image; and a control device configured to adjust a scanning parameter of the second scanning stage based on an analysis result of the processing device to cause the second scanning stage to output a second digital signal. The processing device reconstructs a CT image of the object at a second image quality higher than the first image quality at least based on the second digital signal. The system takes full advantage of the distributed ray sources which replace the normal slip ring technology.

Abstract translation: 公开了一种CT系统及其方法。 该系统包括：输送机构; 第一扫描台，被配置为扫描所述物体并产生第一数字信号; 第二扫描台，在所述物体运动的方向上以预定的距离与所述第一扫描台隔开; 处理装置，被配置为基于所述第一数字信号以第一图像质量重建所述对象的CT图像，并分析所述CT图像; 以及控制装置，其被配置为基于所述处理装置的分析结果来调整所述第二扫描级的扫描参数，以使所述第二扫描级输出第二数字信号。 处理装置至少基于第二数字信号，以比第一图像质量高的第二图像质量重构对象的CT图像。 该系统充分利用了代替普通滑环技术的分布式射线源。

公开(公告)号：US20140185741A1

公开(公告)日：2014-07-03

申请号：US14135023

申请日：2013-12-19

Applicant: Nuctech Company Limited ,  Tsinghua University

Inventor： Le SHEN ,  Yuxiang XING ,  Qi SHEN ,  Meng CAO ,  Li ZHANG ,  Zhiqiang CHEN

IPC: A61B6/00 ,  G01V5/00

CPC classification number: A61B6/482 ,  A61B5/4869 ,  A61B6/027 ,  A61B6/5205 ,  A61B6/54 ,  G01N23/046 ,  G01N2223/419 ,  G01V5/005

Abstract: The present invention relates to a Computed Tomography (CT) imaging system, in particular to a multi-energy CT imaging system and imaging method.

Abstract translation: 本发明涉及一种计算机断层成像（CT）成像系统，特别涉及一种多能CT成像系统和成像方法。