公开(公告)号：US20150332448A1

公开(公告)日：2015-11-19

申请号：US14138399

申请日：2013-12-23

Applicant: Nuctech Company Limited ,  Tsinghua University

Inventor： Li ZHANG ,  Zhiqiang CHEN ,  Ziran ZHAO ,  Qiang LI ,  Jianping GU ,  Yunda SUN

IPC: G06T7/00 ,  G06T15/08 ,  G06T7/60 ,  G01V5/00

CPC classification number: G06T7/0004 ,  G01V5/005 ,  G06K9/00201 ,  G06T7/0002 ,  G06T15/08 ,  G06T2200/04 ,  G06T2207/10116 ,  G06T2207/30112

Abstract: Disclosed are object detection method, display methods and apparatuses. The method includes obtaining slice data of inspected luggage in the CT system; generating 3D volume data of objects in the luggage from the slice data; for each object, determining a semantic description including at least a quantifier description of the object based on the 3D volume data; and upon reception of a user selection of an object, presenting the semantic description of the selected object while displaying a 3D image of the object. The above solutions can create a 3D model for objects in the inspected luggage in a relatively accurate manner, and thus provide better basis for subsequent shape feature extraction and security inspection, and reduce omission factor.

Abstract translation: 本发明涉及物体检测方法，显示方法和装置。 该方法包括在CT系统中获取检验行李的切片数据; 从切片数据生成行李中物体的3D体积数据; 对于每个对象，基于3D体积数据确定至少包括对象的量词描述的语义描述; 并且在接收到对象的用户选择时，在显示对象的3D图像的同时呈现所选对象的语义描述。 上述解决方案可以以相对准确的方式为被检查行李中的对象创建3D模型，从而为随后的形状特征提取和安全检查提供更好的依据，并减少遗漏因素。

公开(公告)号：US20140369458A1

公开(公告)日：2014-12-18

申请号：US14304848

申请日：2014-06-13

Applicant: NUCTECH COMPANY LIMITED

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

IPC: G01N23/04

CPC classification number: G01N23/046 ,  A61B6/032 ,  A61B6/4085 ,  A61B6/4241 ,  A61B6/482 ,  A61B6/5205 ,  A61B6/5258 ,  G06T11/005 ,  G06T11/006 ,  G06T2211/408 ,  G06T2211/436

Abstract: 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.

Abstract translation: 公开了一种CT成像方法和系统。 该方法包括：用双能量CT系统对物体进行CT扫描，以第一扫描模式获得第一完整的投影数据集，并以第二扫描模式获得第二不完全投影数据集; 从所述第一组投影数据重建所述对象的第一衰减系数图像，并且从所述第一衰减系数图像提取所述对象的先前结构信息，指示边缘强度; 以及使用所提取的先前结构信息作为约束，从所述第二不完全投影数据集合重构所述对象的第二衰减系数图像。 通过使用成像对象的先前结构信息作为重建中的约束的方法，可以显着减少重建所需的数据量，并且即使在有限角度和内部重建的不良条件问题的情况下也能够获得令人满意的效果。

公开(公告)号：US20140320855A1

公开(公告)日：2014-10-30

申请号：US14145454

申请日：2013-12-31

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Jianhong ZHANG ,  Hongqiu WANG ,  Ziran ZHAO ,  Jianping GU ,  Zhiming WANG ,  Qingping HUANG ,  Yumin YI

IPC: G01N21/65

CPC classification number: G01N21/65

Abstract: A raman spectroscopy method of measuring melamine contents in dairy products having different matrixes. The method includes: (a) establishing a database of characteristic curves of dairy products having different matrixes; (b) taking several copies of the dairy products having one certain unknown matrix and adding melamine standard solutions having different concentrations therein, to obtain a series of dairy product samples in which the relative concentrations of the melamine are known; (c) performing raman spectrum testing analysis and obtaining corresponding characteristic peak intensities to obtain a slope of the characteristic curve showing variation of the characteristic peak intensities with the relative concentrations of the melamine; (d) searching the database of step (a) using the slope of the characteristic curve of the dairy product samples to find a matching characteristic curve, and (e) calculating concentration of melamine in the dairy products by using the matched characteristic curve and the characteristic peak intensity.

Abstract translation: 测量具有不同基质的乳制品中三聚氰胺含量的拉曼光谱法。 该方法包括：（a）建立具有不同矩阵的乳制品特征曲线数据库; （b）取几份具有一定未知基质的乳制品，并加入其中浓度不同的三聚氰胺标准溶液，以获得其中已知三聚氰胺的相对浓度的一系列乳制品样品; （c）进行拉曼光谱测试分析并获得相应的特征峰强度，以获得特征曲线的斜率，显示特征峰强度与三聚氰胺的相对浓度的变化; （d）使用奶制品样本的特征曲线的斜率来搜索步骤（a）的数据库，以找到匹配的特征曲线，以及（e）通过使用匹配的特征曲线计算乳制品中三聚氰胺的浓度， 特征峰强度。

公开(公告)号：US20140185744A1

公开(公告)日：2014-07-03

申请号：US14140105

申请日：2013-12-24

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Jinyu ZHANG ,  Hu TANG ,  Zhanjun DUAN ,  Li ZHANG ,  Ziran ZHAO

IPC: G01V5/00

CPC classification number: G01V5/005 ,  G01N23/046 ,  G01N2223/419 ,  G01T1/2985

Abstract: A CT apparatus without a gantry. The CT apparatus includes a scanning passage; a stationary X-ray source arranged around the scanning passage and including a plurality of ray emission focal spots; and a plurality of stationary detector modules arranged around the scanning passage and disposed opposite the X-ray source. At least some of the plurality of detector modules may be arranged substantially in an L shape, a semicircular shape, a U shape, an arc shape, a parabolic shape, or a curve shape when viewed in a plane intersecting the scanning passage. The invention ensures that the stationary gantry type CT system has a small size, and a high data identification accuracy.

Abstract translation: 没有龙门架的CT设备。 CT装置包括扫描通道; 固定的X射线源，设置在扫描通道周围并且包括多个射线发射焦点; 以及多个固定检测器模块，其布置在扫描通道周围并且设置成与X射线源相对。 当在与扫描通道相交的平面中观察时，多个检测器模块中的至少一些可以基本上布置成L形，半圆形，U形，弧形，抛物线形或曲线形状。 本发明确保了固定式龙门式CT系统体积小，数据识别精度高。

公开(公告)号：US20140185743A1

公开(公告)日：2014-07-03

申请号：US14140058

申请日：2013-12-24

Applicant: Nuctech Company Limited

Inventor： Jinyu ZHANG ,  Bin SANG ,  Zhanjun DUAN ,  Li ZHANG ,  Ziran ZHAO

IPC: G01V5/00

CPC classification number: G01V5/005 ,  G01N23/046 ,  G01N2223/20 ,  G01N2223/419 ,  G01N2223/5015 ,  G01T1/2985

Abstract: A stationary CT apparatus and a method of controlling the same. The stationary CT apparatus includes: a scanning passage; a stationary carbon nanotube X-ray source arranged around the scanning passage and comprising a plurality of ray emission focal spots; and a plurality of stationary detector modules arranged around the scanning passage and disposed opposite the X-ray source. At least some of the plurality of detector modules are arranged in a substantially L shape or a substantially Π shape when viewed in a plane intersecting the scanning passage. Reconstruction of the CT apparatus without a rotary gantry is achieved and special substances in an object under inspection is identified by optimizing design of the carbon nanotube X-ray source and the detector device. The invention ensures that the stationary gantry type CT system has a small size and a high accuracy and is particularly suitable for safety inspection of baggage.

Abstract translation: 固定CT装置及其控制方法。 固定CT装置包括：扫描通道; 固定碳纳米管X射线源，其布置在所述扫描通道周围并且包括多个射线发射焦斑; 以及多个固定检测器模块，其布置在扫描通道周围并且设置成与X射线源相对。 多个检测器模块中的至少一些被布置成大致L形或基本上为＆P; 在与扫描通道相交的平面中观察时的形状。 通过优化碳纳米管X射线源和检测器设备的设计，可以实现没有旋转台架的CT设备的重建，并检测被检查物体中的特殊物质。 本发明确保了固定式龙门式CT系统的尺寸小，精度高，特别适用于行李的安全检查。

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：US20250045984A1

公开(公告)日：2025-02-06

申请号：US18722485

申请日：2022-10-24

Applicant: NUCTECH COMPANY LIMITED ,  Tsinghua University

Inventor： Li ZHANG ,  Zhiqiang CHEN ,  Yunda SUN ,  Xinbin LI ,  Zhenhua ZHAO ,  Tiao ZHAO ,  Xin JIN

IPC: G06T11/00 ,  G01N23/046

Abstract: A calibration assembly, including: a base; and a plurality of calibration wires dispersedly connected to the base. An absorption capacity of the calibration wire for X rays is greater than that of the base for X rays. Through a specific structure design of a plurality of calibration wires in the calibration assembly, the calibration wires are dispersedly connected to the base, and taking advantage of the characteristics that the absorption capacity of the calibration wire for X rays is greater than that of the base for X rays, the calibration wires are applied to the calibration phantom, and the calibration phantom is scanned in the scanning system. By continuously adjusting the geometric parameter values in the imaging method, the optimal geometric parameter values that are closest to the real scanning system structure may be obtained, thereby improving the imaging effect of the scanning system.

公开(公告)号：US20240410838A1

公开(公告)日：2024-12-12

申请号：US18698356

申请日：2022-09-29

Applicant: NUCTECH COMPANY LIMITED

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Qingping HUANG ,  Xin JIN ,  Ming CHANG ,  Mingzhi HONG ,  Liguo ZHANG

IPC: G01N23/046

Abstract: An inspection device includes: an inspection channel, through which the object enters and exits the inspection device; an imaging system, including a radiation source used to generate a ray, the radiation source is disposed on one side of the inspection channel, and the ray at least forms a main beam surface applicable to scan and inspect the object; and a detector used to receive the ray passing through the object, the detector is disposed on the other side of the inspection channel to form an inspection region between the radiation source and the detector; and a posture adjustment structure disposed in the inspection region and used to adjust a posture of the object in the inspection region. The object has an inspection surface. The posture adjustment structure may adjust the posture of the object, so that the inspection surface and the main beam surface are in the same plane.

公开(公告)号：US20240377553A1

公开(公告)日：2024-11-14

申请号：US18574638

申请日：2022-07-06

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Qingping HUANG ,  Yong ZHOU ,  Hui DING ,  Xin JIN ,  Chao JI

IPC: G01V5/226

Abstract: Provided are an inspection method, and an inspection system including: at least one ray source; a detector assembly and a conveying device. At least one ray source and the detector assembly may move in a traveling direction relative to the conveying device, so that the to-be-inspected object may enter an inspection region. When viewed along a central axis of the inspection region, at least one ray source may translate between scanning positions, and a translation distance of at least one ray source between two adjacent scanning positions is greater than a spacing between adjacent target spots of each ray source. When at least one ray source is located at one scanning position, at least one ray source and the detector assembly move in the traveling direction and at least one ray source emits X-rays. After moving a predetermined distance, at least one ray source translates to another scanning position.

公开(公告)号：US20240210333A1

公开(公告)日：2024-06-27

申请号：US18284623

申请日：2022-01-13

Applicant: NUCTECH COMPANY LIMITED ,  Tsinghua University

Inventor： Li ZHANG ,  Zhiqiang CHEN ,  Qingping HUANG ,  Jinning LIANG ,  Mingzhi HONG ,  Yi CHENG ,  Minghua QIU ,  Yao ZHANG ,  Jianxue YANG ,  Lei ZHENG

IPC: G01N23/083

CPC classification number: G01N23/083 ,  G01N2223/1016 ,  G01N2223/32 ,  G01N2223/321 ,  G01N2223/643

Abstract: A radiographic inspection device and a method of inspecting an object are provided. The radiographic inspection device includes: a support frame, where an inspection space applicable to inspect an object is formed within the support frame, and the inspection space has an opening connecting to an outside; a transfer mechanism applicable to carry the object to move through the inspection space; a shielding curtain mounted at the opening; and a driving mechanism mounted on the support frame and configured to drive the shielding curtain to move, in response to the object getting close to or moving away from the opening, so as to open or close the opening.