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21. 发明授权

US10984565B2 Image processing method using convolutional neural network, image processing device and storage medium 有权
公开(公告)号：US10984565B2
公开(公告)日：2021-04-20
申请号：US16235882
申请日：2018-12-28
申请人： Tsinghua University , NUCTECH COMPANY LIMITED
发明人： Yuxiang Xing , Kaichao Liang , Le Shen , Li Zhang , Hongkai Yang , Kejun Kang , Zhiqiang Chen , Jianmin Li , Yinong Liu
IPC分类号： G06T11/00 , G06N3/08
摘要： An image processing method, comprising: acquiring, by a CT scanning system, projection data of an object; and processing, by using a convolutional neural network, the projection data, to acquire an estimated image of the object. The convolutional neural network comprises: a projection domain network for processing input projection data to obtain estimated projection data; an analytical reconstruction network layer for performing analytical reconstruction to obtain a reconstructed image; an image domain network for processing the reconstructed image to obtain an estimated image, a projection layer for performing a projection operation by using a system projection matrix of the CT scanning system, to obtain a projection result of the estimated image; and a statistical model layer for determining consistency among the input projection data, the estimated projection data, and the projection result of the estimated image based on a statistical model.

22. 发明申请

US20170328844A1 METHOD FOR PERFORMING MATERIAL DECOMPOSITION USING A DUAL-ENERGY X-RAY CT AND CORRESPONDING DUAL-ENERGY X-RAY CT APPARATUS 审中-公开
公开(公告)号：US20170328844A1
公开(公告)日：2017-11-16
申请号：US15494884
申请日：2017-04-24
申请人： Tsinghua University , Nuctech Company Limited
发明人： Liang Li , Zhiqiang Chen , Kejun Kang , Li Zhang , Ziran Zhao , Yuxiang Xing , Jianmin Li , Yulan Li , Tiao Zhao
IPC分类号： G01N23/087
CPC分类号： G01N23/087 , G01N23/046 , G01N2223/206 , G01N2223/419 , G01N2223/423
摘要： Methods and system for decomposing a high-energy dual-energy X-ray CT material are disclosed. In the method, two types of effect such as Compton effect and electron pairing effect which dominates are reserved and the influence of the other effect such a photoelectric effect is removed so as to improve the accuracy of the material decomposition. The unique advantage of the present disclosure is to effectively remove the error of the calculated atomic number Z due to directly selecting two effects during processes of material decomposition in the conventional dual-energy CT method. This may greatly improve the accuracy of dual-energy CT identification of the material, and it is important to improve the conventional dual-use CT imaging system applications, such as clinical therapy, security inspection, industrial non-destructive testing, customs anti-smuggling and other fields.

23. 发明授权

US09495772B2 CT imaging systems and methods thereof 有权
标题翻译： CT成像系统及方法
公开(公告)号：US09495772B2
公开(公告)日：2016-11-15
申请号：US14758795
申请日：2013-10-31
申请人： NUCTECH COMPANY LIMITED , TSINGHUA UNIVERSITY
发明人： Le Shen , Yuxiang Xing , Yuanji Li , Chuqing Feng , Li Zhang , Zhiqiang Chen
IPC分类号： A61B6/00 , G06T11/00 , G06T5/50 , G01N23/04 , G01T1/29 , A61B6/03
CPC分类号： G06T11/005 , A61B6/032 , A61B6/4241 , A61B6/4266 , A61B6/482 , A61B6/5205 , G01N23/046 , G01N2223/419 , G01T1/2985 , G06T5/50 , G06T2207/10081 , G06T2207/20182
摘要： CT imaging systems and methods thereof are disclosed. A common CT scanning is performed on an object to obtain a common CT imaging. An area of interest is determined from the image. A CT scanning is performed on the area of interest under a plurality of energy windows by a photon counter detector. A high resolution image of the area of interest is reconstructed. The discrimination of energy spectrum is higher and the result so obtained is more stable by using a photon counter detector to collect photon count projection data of a plurality of energy windows and thus it may be decomposed into a plurality of basis functions.
摘要翻译：公开了CT成像系统及其方法。对物体执行常见的CT扫描以获得常见的CT成像。根据图像确定感兴趣的区域。通过光子计数器检测器在多个能量窗口下对感兴趣的区域进行CT扫描。重建感兴趣区域的高分辨率图像。通过使用光子计数器检测器来收集多个能量窗口的光子计数投影数据，能量谱的辨别较高，得到的结果更加稳定，因此可将其分解为多个基本函数。

24. 发明授权

US09466137B2 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：US09466137B2
公开(公告)日：2016-10-11
申请号：US14708866
申请日：2015-05-11
申请人： Nuctech Company Limited , Tsinghua University
发明人： Li Zhang , Zhiqiang Chen , Le Shen , Yuxiang Xing , Xin Jin , Qingping Huang
IPC分类号： G06K9/00 , G06T11/00 , A61B6/03 , A61B6/02 , A61B6/00 , G06T7/00
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，对重定位数据进行锥角余弦加权和一维滤波，最后在滤波数据上实现平行光束反投影，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。

25. 发明授权

US09448325B2 Apparatus and method for ray scanning imaging 有权
标题翻译：用于射线扫描成像的装置和方法
公开(公告)号：US09448325B2
公开(公告)日：2016-09-20
申请号：US14129655
申请日：2012-12-31
申请人： Nuctech Company Limited , Tsinghua University
发明人： Zhiqiang Chen , Li Zhang , Ziran Zhao , Yuxiang Xing , Jia Hao , Liang Li
IPC分类号： G01V5/00 , G01N23/04 , A61B6/03 , A61B6/00 , G01T1/29
CPC分类号： G01V5/0016 , A61B6/032 , A61B6/4007 , A61B6/4014 , A61B6/4078 , A61B6/4233 , A61B6/4275 , G01N23/046 , G01T1/2985 , G01V5/005
摘要： The present invention discloses apparatus and method for ray scanning imaging. The apparatus comprises a plurality of ray generators and a ray detection device. The plurality of ray generators are arranged uniformly along a circular arc and emit ray beams in sequence or simultaneously to an object to be inspected within a single scanning period. The ray detection device may be either in a multi-segmental semi-closed configuration composed of a plurality of linear arrays of ray detectors or in a circular arc configuration where a plurality of ray detectors arranged uniformly along a circular arc. During the inspection, the apparatus is advantageous in obtaining the complete ray projection values without rotation thereof, so as to effectively shorten the inspection time.
摘要翻译：本发明公开了一种用于射线扫描成像的装置和方法。该装置包括多个射线发生器和射线检测装置。多个射线发生器沿着圆弧均匀地布置，并且在单个扫描周期内依次发射射线束或同时发射到被检查物体。射线检测装置可以是由多个线性阵列的射线检测器组成的多节段半封闭构造，也可以是多个沿着圆弧均匀布置的射线检测器的圆弧形状。在检查期间，该装置有利于获得完整的射线投影值而不旋转，以便有效地缩短检查时间。

26. 发明授权

US09702832B2 CT imaging methods and systems 有权
公开(公告)号：US09702832B2
公开(公告)日：2017-07-11
申请号：US14304848
申请日：2014-06-13
申请人： NUCTECH COMPANY LIMITED
发明人： Le Shen , Yuxiang Xing , Li Zhang , Zhiqiang Chen
IPC分类号： A61B6/03 , G01N23/04 , A61B6/00 , G06T11/00
CPC分类号： G01N23/046 , A61B6/032 , A61B6/4085 , A61B6/4241 , A61B6/482 , A61B6/5205 , A61B6/5258 , G06T11/005 , G06T11/006 , G06T2211/408 , G06T2211/436
摘要： Disclosed is a CT imaging method and system. The method includes: CT scanning an object with a dual-energy CT system to obtain a first complete set of projection data in a first scan mode, and to obtain a second incomplete set of projection data in a second scan mode; reconstructing a first attenuation coefficient image of the object from the first set of projection data, and extracting, from the first attenuation coefficient image, prior structure information of the object indicating edge intensity; and reconstructing a second attenuation coefficient image of the object from the second incomplete set of projection data using the extracted prior structure information as a constraint. With the method using the prior structure information of the imaged object as a constraint in reconstruction, it is possible to dramatically reduce an amount of data required for reconstruction, and achieve satisfactory effects even with ill-conditioned problems of limited-angle and inner reconstruction.

27. 发明授权

US11022569B2 Low-angle self-swinging, large-scale multi-slice spiral computed tomography apparatus and inspection method 有权
公开(公告)号：US11022569B2
公开(公告)日：2021-06-01
申请号：US16029896
申请日：2018-07-09
申请人： Nuctech Company Limited
发明人： Kejun Kang , Zhiqiang Chen , Yuanjing Li , Li Zhang , Ziran Zhao , Yaohong Liu , Jianping Gu , Liang Li , Yuxiang Xing
IPC分类号： G01N23/046 , G01V5/00
摘要： A low-angle self-swinging type computed tomography (CT) device is provided, having an X-ray accelerator and a plurality of rows of detectors and includes a slip ring, such that the slip ring with the accelerator and the detectors thereon is capable of performing a single-pendulum reciprocating movement while an object to be inspected passes through the slip ring, a three-dimensional CT image of the object is displayed, thereby achieving accurate inspection for large-scale objects, such as van containers.

28. 发明申请

US20190295250A1 METHOD, APPARATUS AND SYSTEM FOR RECONSTRUCTING IMAGES OF 3D SURFACE 审中-公开
公开(公告)号：US20190295250A1
公开(公告)日：2019-09-26
申请号：US16316487
申请日：2017-05-03
申请人： Nuctech Company Limited
发明人： Li Zhang , Sen Wang , Zhiqiang Chen , Yuxiang Xing , Xin Jin
IPC分类号： G06T7/00 , G06T7/33
摘要： The present disclosure discloses a method, an apparatus and a system for reconstructing an image of a three-dimensional surface. The method comprises the following steps of: constructing a three-dimensional model of the three-dimensional surface using X-ray imaging data obtained by imaging the three-dimensional surface with X-ray and extracting three-dimensional coordinate parameters of feature points; constructing one or more two-dimensional posture images of the three-dimensional surface using visible light imaging data obtained by imaging the three-dimensional surface with visible lights, and extracting two-dimensional coordinate parameters of feature points from each of the two-dimensional posture images; establishing a mapping relationship between the two-dimensional posture image and the three-dimensional model by matching the three-dimensional coordinate parameters and the two dimensional coordinate parameters of the feature points in each of the two-dimensional posture image; and filling the one or more two-dimensional posture image onto the three-dimensional model utilizing the mapping relationship established for each of the two dimensional posture images to form a reconstructed image of the three-dimensional surface, wherein the X-ray imaging data and the visible light imaging data of the three-dimensional surface along the same orientation are simultaneously captured.

29. 发明授权

US11179579B2 Tomographic imaging and image-guided radiation therapy apparatus 有权
公开(公告)号：US11179579B2
公开(公告)日：2021-11-23
申请号：US16966547
申请日：2018-12-29
申请人： Tsinghua University
发明人： Hewei Gao , Zhiqiang Chen , Li Zhang , Yuxiang Xing
IPC分类号： A61B6/00 , A61N5/10 , A61B6/03 , G01T1/20
摘要： An image-guided radiation therapy apparatus comprises: a high-energy ray source configured for radiation therapy of an object; and a KV ray source, a first and second PET detectors, and a CT detector for KV CT and PET imaging for guiding the radiation therapy. The KV ray source is placed on, or at an inner or outer side of the first PET detector; the second PET detector and the CT detector are configured to receive the KV ray to perform KV CT imaging; the PET detectors are further configured to receive gamma ray emitted by the object to perform PET imaging.

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