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1. 发明公开

EP2843623A3 X-ray dual-energy CT reconstruction method 有权
标题翻译： X射线双能量CT重建方法
公开(公告)号：EP2843623A3
公开(公告)日：2015-04-22
申请号：EP14177280.6
申请日：2014-07-16
申请人： Tsinghua University , Nuctech Company Limited
发明人： Yuxiang, Xing , Shen, Le , Zhang, Li , Chen, Zhiqiang , Liang,Li
IPC分类号： G06T11/00
CPC分类号： G01N23/046 , G06T11/006 , G06T2207/10081 , G06T2207/20182 , G06T2207/30004 , G06T2211/408 , G06T2211/424
摘要： 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 p H and low-energy data p L of a dual-energy CT imaging system using a detector of the dual-energy CT imaging system; (c) obtaining projection images R 1 and R 2 of scaled images r 1 and r 2 according to the obtained high-energy data p H and low-energy data p L ; (d) reconstructing the scaled image r 2 using a first piece-wise smooth constraint condition and thereby obtaining an electron density image; and (e) reconstructing the scaled image r 1 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.
摘要翻译：本发明涉及一种基于自身先验信息的X射线双能量CT重建方法，该方法可以利用数据中固有的信息来提供先验模型，从而获得高质量的重建图像。根据本公开的X射线双能量CT重建方法包括：（a）对能谱进行评级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和低能数据pL; （c）根据获得的高能数据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; （e）使用第二分段平滑约束条件重建缩放图像r1，从而获得等价原子序数图像。在本公开中，通过有效地使用数据中固有的信息，可以在保持分辨率的同时有效地禁止双能量重构图像中的噪声。

2. 发明公开

EP2843623A2 X-ray dual-energy CT reconstruction method 有权
标题翻译：伦琴 - 双能-CT-Rekonstruktionsverfahren
公开(公告)号：EP2843623A2
公开(公告)日：2015-03-04
申请号：EP14177280.6
申请日：2014-07-16
申请人： Tsinghua University , Nuctech Company Limited
发明人： Yuxiang, Xing , Shen, Le , Zhang, Li , Chen, Zhiqiang , Liang,Li
IPC分类号： G06T11/00
CPC分类号： G01N23/046 , G06T11/006 , G06T2207/10081 , G06T2207/20182 , G06T2207/30004 , G06T2211/408 , G06T2211/424
摘要： 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 p H and low-energy data p L of a dual-energy CT imaging system using a detector of the dual-energy CT imaging system; (c) obtaining projection images R 1 and R 2 of scaled images r 1 and r 2 according to the obtained high-energy data p H and low-energy data p L ; (d) reconstructing the scaled image r 2 using a first piece-wise smooth constraint condition and thereby obtaining an electron density image; and (e) reconstructing the scaled image r 1 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.
摘要翻译：本发明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p H和低能数据p L; （c）根据获得的高能量数据p H和低能量数据p L获得缩放图像r 1和r 2的投影图像R 1和R 2; （d）使用第一分段平滑约束条件重建缩放图像r 2，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r 1，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。

3. 发明公开

EP2945125A3 SPIRAL CT SYSTEMS AND RECONSTRUCTION METHODS 有权
标题翻译： SPIRALFÖRMIGECT-SYSTEME UND REKONSTRUKTIONSVERFAHREN
公开(公告)号：EP2945125A3
公开(公告)日：2015-11-25
申请号：EP15167283.9
申请日：2015-05-12
申请人： Nuctech Company Limited , Tsinghua University
发明人： Zhang, Li , Chen, Zhiqiang , Shen, Le , Xing, Yuxiang , Jin, Xin , Huang, Qingping
IPC分类号： G06T11/00
CPC分类号： G06T11/006 , A61B6/027 , A61B6/032 , A61B6/4085 , A61B6/4266 , A61B6/5205 , G06T7/0012 , G06T2207/10081 , G06T2207/30004 , G06T2211/421
摘要： The present disclosure discloses a spiral CT system and a reconstruction method thereof. In some embodiments, it is proposed that data missing due to a large pitch is compensated by weighting the complementary projection data of the projection data obtained using the spiral CT system. After the data is complemented, the projection data is rebinned as cone parallel beam data, cone-angle cosine weighting and one-dimensional filtering are implemented on the rebinned data, and parallel beam back projection is finally implemented on the filtered data, to obtain the reconstructed images. In some embodiments, with the above method, the speed of the belt can be increased by more than one time in a case that the existing area of the detectors and the existing speed of the slip ring are unchanged, thereby improving the pass rate of the luggage and maintaining the quality of the reconstructed images unchanged.
摘要翻译：本公开公开了一种螺旋CT系统及其重建方法。在一些实施例中，提出通过对使用螺旋CT系统获得的投影数据的互补投影数据进行加权来补偿由于大音调而丢失的数据。数据补充后，将投影数据重新设置为锥形平行光束数据，锥形余弦加权和一维滤波在重新定位的数据上实现，并且最终在滤波数据上实现并行光束反投影，以获得重建图像。在一些实施例中，利用上述方法，在检测器的现有区域和滑环的现有速度不变的情况下，带的速度可以增加多于一次，从而提高了传感器的通过率行李保持重建图像的质量不变。

4. 发明公开

EP2945125A2 SPIRAL CT SYSTEMS AND RECONSTRUCTION METHODS 有权
标题翻译：螺旋CT系统和重建方法
公开(公告)号：EP2945125A2
公开(公告)日：2015-11-18
申请号：EP15167283.9
申请日：2015-05-12
申请人： Nuctech Company Limited , Tsinghua University
发明人： Zhang, Li , Chen, Zhiqiang , Shen, Le , Xing, Yuxiang , Jin, Xin , Huang, Qingping
IPC分类号： G06T11/00
CPC分类号： G06T11/006 , A61B6/027 , A61B6/032 , A61B6/4085 , A61B6/4266 , A61B6/5205 , G06T7/0012 , G06T2207/10081 , G06T2207/30004 , G06T2211/421
摘要： The present disclosure discloses a spiral CT system and a reconstruction method thereof. In some embodiments, it is proposed that data missing due to a large pitch is compensated by weighting the complementary projection data of the projection data obtained using the spiral CT system. After the data is complemented, the projection data is rebinned as cone parallel beam data, cone-angle cosine weighting and one-dimensional filtering are implemented on the rebinned data, and parallel beam back projection is finally implemented on the filtered data, to obtain the reconstructed images. In some embodiments, with the above method, the speed of the belt can be increased by more than one time in a case that the existing area of the detectors and the existing speed of the slip ring are unchanged, thereby improving the pass rate of the luggage and maintaining the quality of the reconstructed images unchanged.
摘要翻译：本公开公开了一种螺旋CT系统及其重建方法。在一些实施例中，提出通过对使用螺旋CT系统获得的投影数据的互补投影数据进行加权来补偿由于大间距而丢失的数据。数据补充完成后，将投影数据重组为锥形平行束数据，对重组后的数据进行锥角余弦加权和一维滤波，最后对滤波数据进行平行束反投影，得到重建图像。在一些实施例中，利用上述方法，在检测器的现有面积和滑环的现有速度不变的情况下，带的速度可以增加一倍以上，由此提高并保持重建图像的质量不变。

5. 发明公开

EP2749219A1 Multi-energy CT imaging system and imaging method 有权转让
标题翻译： VorrichtungfürMehrfachenergie-Computertomographie und Abbildungsverfahren
公开(公告)号：EP2749219A1
公开(公告)日：2014-07-02
申请号：EP13198192.0
申请日：2013-12-18
申请人： Tsinghua University , Nuctech Company Limited
发明人： Shen, Le , Zhang, Li , Xing, Yuxiang , Cao, Meng , Chen, Zhiqiang , Shen, Qi
IPC分类号： A61B6/00
CPC分类号： A61B6/482 , A61B5/4869 , A61B6/027 , A61B6/5205 , A61B6/54 , G01N23/046 , G01N2223/419 , G01V5/005
摘要： The present invention relates to multi-energy CT imaging system and imaging method. The multi-energy CT imaging system comprises: a stage for carrying the object to be inspected; voltage-regulatable X-ray generation device for emitting X-rays; a detector for receiving X-rays emitted from said X-ray generation device and penetrating said object to be inspected, and for outputting detection data; a rack having said X-ray generation device and said detector mounted thereon; and a data processing and control device for controlling said stage, said X-ray generation device, said detector and said rack, processing detected data, and during one rotation of scan of said X-ray generation device, evenly dividing the circular track of said X-ray generation device into angle intervals of a predetermined number according to the predetermined number of energies and setting a different high voltage of said X-ray generation device for each angle interval, and when said rack rotates from the current angle interval into a next angle interval, controlling said X-ray generation device to switch it to a voltage set in the next angle interval.
摘要翻译：本发明涉及多能CT成像系统和成像方法。多能CT成像系统包括：用于携带被检查物体的载物台; 用于发射X射线的电压可调X射线发生装置; 用于接收从所述X射线产生装置发射的X射线并穿透所述被检查对象的检测器，用于输出检测数据; 具有安装在其上的所述X射线产生装置和所述检测器的支架; 以及数据处理和控制装置，用于控制所述级，所述X射线产生装置，所述检测器和所述支架，处理检测数据，并且在所述X射线产生装置的扫描的一次旋转期间，均匀地分割所述X射线产生装置的圆形轨迹 X射线产生装置根据预定的能量数量设置为预定数量的角度间隔，并且对于每个角度间隔设置所述X射线产生装置的不同高电压，并且当所述支架从当前角度间隔转动到下一个控制所述X射线产生装置将其切换到在下一个角度间隔中设定的电压。

6. 发明公开

EP3632328A1 THRESHOLD VALUE OPTIMIZING METHOD AND APPARATUS BASED ON K-EDGE IMAGING, DEVICE, AND MEDIUM 有权
公开(公告)号：EP3632328A1
公开(公告)日：2020-04-08
申请号：EP19762285.5
申请日：2019-05-16
申请人： Nuctech Company Limited , Tsinghua University
发明人： Xing, Yuxiang , Huang, Kaixin , Zhang, Li , Shen, Le , Deng, Zhi , Chen, Zhiqiang , Liu, Yinong
IPC分类号： A61B6/03 , G01T1/24
摘要： The present application provides a method, apparatus, device and medium for optimizing thresholds based on K-edge imaging. The method comprises: pre-scanning, by using a photon counting detector, an object to be detected according to a preset threshold group, to obtain first detection data; determining, according to the first detection data, line integral values of decomposition coefficients of individual basis functions in a basis function combination of each ray, wherein each ray has a fixed basis function combination; selecting, according to the line integral values of the decomposition coefficients of individual basis functions in the basis function combination of the each ray, rays of which a line integral value of a contrast agent material basis function in the fixed basis function combination is greater than a preset line integration threshold; inputting detection data corresponding to each of the selected rays to a pre-trained neural network model, to obtain a local optimal threshold group of each of the selected rays; and determining, based on local optimal threshold groups, a global optimal threshold group for the K-edge imaging of the photon counting detector.

7. 发明授权

EP2945125B1 SPIRAL CT SYSTEMS AND RECONSTRUCTION METHODS 有权
公开(公告)号：EP2945125B1
公开(公告)日：2019-07-10
申请号：EP15167283.9
申请日：2015-05-12
申请人： Nuctech Company Limited , Tsinghua University
发明人： Zhang, Li , Chen, Zhiqiang , Shen, Le , Xing, Yuxiang , Jin, Xin , Huang, Qingping
IPC分类号： G06T11/00

8. 发明授权

EP2843623B1 X-ray dual-energy CT reconstruction method 有权
公开(公告)号：EP2843623B1
公开(公告)日：2019-02-13
申请号：EP14177280.6
申请日：2014-07-16
申请人： Tsinghua University , Nuctech Company Limited
发明人： Yuxiang, Xing , Shen, Le , Zhang, Li , Chen, Zhiqiang , Liang,Li
IPC分类号： G06T11/00

9. 发明公开

EP2889644A3 Multi-spectral static CT apparatuses 有权
标题翻译： Statische multispektrale CT-Vorrichtungen
公开(公告)号：EP2889644A3
公开(公告)日：2015-11-25
申请号：EP14199145.5
申请日：2014-12-19
申请人： Tsinghua University , Nuctech Company Limited
发明人： Chen, Zhiqiang , Zhang, Li , Huang, Qingping , Sun, Yunda , Jin, Xin , Yang, Tao , Shen, Le , Zhao, Ji
IPC分类号： G01T1/29
CPC分类号： G01V5/0041 , G01N23/046 , G01T1/2985 , G01V5/005
摘要： Multi-spectral static CT apparatuses are disclosed. The apparatus includes a ray source in a form of multiple distributed spots, multiple columns of detectors, a data acquisition device, a luggage carrying and control device, and a multi-spectral projection data processing device. An object of the present disclosure is to combine static CT scanning technology with multi-spectral analysis technology. It has advantages of the static CT system, such as high scanning speed, simple mechanic structure, cost reduction due to omission of slip ring. It also can perform identification of material in an article, and can be widely applied in occasions like safety inspection, and smuggling suppression at customs.
摘要翻译：公开了多光谱静态CT装置。该装置包括多个分布点的形式的射线源，多列检测器，数据采集装置，行李携带和控制装置以及多光谱投影数据处理装置。本公开的目的是将静态CT扫描技术与多光谱分析技术相结合。静电CT系统具有扫描速度快，机械结构简单，省略滑环成本降低的优点。也可以在物品中进行材料鉴定，并可广泛应用于安全检查，海关走私抑制等场合。

10. 发明公开

EP2889649A1 CT systems and methods thereof 有权
标题翻译： CT系统及其方法
公开(公告)号：EP2889649A1
公开(公告)日：2015-07-01
申请号：EP14199265.1
申请日：2014-12-19
申请人： Tsinghua University , Nuctech Company Limited
发明人： Zhang, Li , Chen, Zhiqiang , Huang, Qingping , Jin, Xin , Sun, Yunda , Shen, Le , Zhao, Ji
IPC分类号： G01V5/00
摘要： A CT system and method thereof are discloses. The system includes: a conveyor mechanism (110); a first scanning stage (A) configured to scan the object and generate a first digital signal; a second scanning stage (B) spaced from the first scanning stage at a preset distance in a direction of the object's movement; a processing device (130) 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 (140) 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.
摘要翻译：公开了一种CT系统及其方法。该系统包括：输送机构（110）; 第一扫描级（A），配置为扫描物体并产生第一数字信号; 第二扫描阶段（B），所述第二扫描阶段（B）在所述物体的移动方向上以预设距离与所述第一扫描阶段间隔开; 处理装置（130），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（140），被配置为基于处理装置的分析结果调整第二扫描级的扫描参数，以使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高于第一图像质量的第二图像质量重建对象的CT图像。该系统充分利用分布式光源取代普通滑环技术。

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