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    CT systems and methods thereof
    11.
    发明授权
    CT systems and methods thereof 有权

    公开(公告)号：US09746579B2

    公开(公告)日：2017-08-29

    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: A61B6/00 ,  G01V5/00 ,  G01N23/04 ,  G01T7/08 ,  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 disclosed. 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.

    CT imaging methods and systems
    12.
    发明授权
    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

    Applicant: NUCTECH COMPANY LIMITED

    Inventor： Le Shen ,  Yuxiang Xing ,  Li Zhang ,  Zhiqiang Chen

    IPC: A61B6/03 ,  G01N23/04 ,  A61B6/00 ,  G06T11/00

    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.

    3-dimensional model creation methods and apparatuses
    16.
    发明授权
    3-dimensional model creation methods and apparatuses 有权
    三维模型创建方法和装置

    公开(公告)号：US09557436B2

    公开(公告)日：2017-01-31

    申请号：US14138447

    申请日：2013-12-23

    Applicant: Tsinghua University ,  Nuctech Company Limited

    Inventor： Zhiqiang Chen ,  Li Zhang ,  Ziran Zhao ,  Qiang Li ,  Jianping Gu ,  Qingping Huang

    IPC: G06T17/00 ,  G01V5/00 ,  G06T7/00 ,  G06K9/00

    CPC classification number: G01V5/005 ,  G06K9/00214 ,  G06K2209/09 ,  G06T7/11 ,  G06T7/187 ,  G06T17/00 ,  G06T2207/10081 ,  G06T2207/30112

    Abstract: Disclosed are methods and apparatuses for creating a 3-Dimensional model for objects in an inspected luggage in a CT system. The method includes acquiring slice data of the luggage with the CT system; interpolating the slice data to generate 3D volume data of the luggage; performing unsupervised segmentation on the 3D volume data of the luggage to obtain a plurality of segmental regions; performing isosurface extraction on the plurality of segmental regions to obtain corresponding isosurfaces; and performing 3D surface segmentation on the isosurfaces to form a 3D model for the objects in the luggage. 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: 公开了用于在CT系统中检查的行李中的物体创建三维模型的方法和装置。 该方法包括采用CT系统获取行李的切片数据; 内插切片数据以生成行李的3D体积数据; 对行李的3D体积数据执行无监督分割以获得多个分段区域; 在多个分段区域进行等值面提取以获得相应的等值面; 并在等面上执行3D表面分割，以形成行李中物体的3D模型。 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。

    Methods and devices for inspecting liquid
    17.
    发明授权
    Methods and devices for inspecting liquid 有权
    检查液体的方法和装置

    公开(公告)号：US09442212B2

    公开(公告)日：2016-09-13

    申请号：US14804087

    申请日：2015-07-20

    Applicant: NUCTECH COMPANY LIMITED

    Inventor： Yumin Yi ,  Li Zhang ,  Hongqiu Wang ,  Huacheng Feng ,  Jianhong Zhang

    IPC: G01J3/44 ,  G01N11/00 ,  G01N33/00 ,  G01N31/00 ,  G01N21/90 ,  G01J5/00 ,  G01J5/02 ,  G06K9/00 ,  G01V5/00 ,  G01N21/65 ,  G01N23/04 ,  G01N23/087

    CPC classification number: G01V5/0033 ,  G01N21/65 ,  G01N23/046 ,  G01N23/087 ,  G01N2021/651 ,  G01N2201/0612 ,  G01V5/0008

    Abstract: Methods and devices for inspecting liquid are disclosed. According to the method, it is firstly determined whether the package of the liquid is transparent, semi-transparent, or opaque; in a case that the package of the liquid is transparent or semi-transparent, Raman spectrum analysis is implemented by a Raman spectrum module on the inspected liquid to judge whether the inspected liquid is dangerous or is suspected; and in a case that the package of the inspected liquid is opaque, the inspected liquid are inspected by using an X-ray dual-energy scanning technology to judge whether the inspected liquid is dangerous or is suspected. The above solution has advantages that the inspection speed is high, the material can be recognized, it is suitable for various packing materials with various shapes, the accuracy of the inspection result is high or the like. Therefore, the solution is suitable for security inspection in public places with high security inspection requirements, complicated inspected liquids, high personnel flow rate or the like.

    Abstract translation: 公开了用于检查液体的方法和装置。 根据该方法，首先确定液体的包装是透明的，半透明的还是不透明的; 在液体的包装是透明或半透明的情况下，拉曼光谱分析由检查液体上的拉曼光谱模块进行，以判断被检液体是否是危险的或被怀疑的; 并且在被检查液体的包装不透明的情况下，通过使用X射线双能扫描技术来检查被检查液体，以判断被检查液体是否是危险的或被怀疑的。 上述解决方案具有检测速度高，材料可以识别的优点，适用于各种形状的各种包装材料，检验结果准确度高等优点。 因此，该解决方案适用于公安场所的安全检查，具有较高的安全检查要求，复杂的检查液体，高人流量等。

    Raman spectrum measuring method for drug inspection
    19.
    发明授权
    Raman spectrum measuring method for drug inspection 有权
    用于药物检查的拉曼光谱测量方法

    公开(公告)号：US09250180B2

    公开(公告)日：2016-02-02

    申请号：US14495233

    申请日：2014-09-24

    Applicant: Nuctech Company Limited ,  Tsinghua University

    Inventor： Zhiqiang Chen ,  Li Zhang ,  Jianhong Zhang ,  Hongqiu Wang ,  Ziran Zhao ,  Yumin Yi ,  Jianping Gu ,  Qingping Huang

    IPC: G01J3/44 ,  G01N21/47 ,  G01N33/15 ,  G01N21/65

    CPC classification number: G01N21/47 ,  G01J3/44 ,  G01N21/65 ,  G01N21/658 ,  G01N33/15

    Abstract: A raman spectrum measuring method for drug inspection is provided, comprising: measuring raman spectrum of a sample to be inspected to acquire an original raman spectrum curve of the sample; determining whether the original raman spectrum curve has a characterizing portion, and if not, measuring a mixture of the sample and an enhancing agent to acquire an enhanced raman spectrum curve of the sample; and if the original raman spectrum curve of the sample to be inspected has a characterizing portion, comparing the original raman spectrum curve of the sample with data in an original raman spectrum database of a drug to determine whether the sample contains the drug, otherwise, comparing the enhanced raman spectrum curve of the sample with data in an enhanced raman spectrum database of the drug to determine whether the sample to be inspected contains the drug.

    Abstract translation: 提供了用于药物检查的拉曼光谱测量方法，包括：测量被检样品的拉曼光谱以获得样品的原始拉曼光谱曲线; 确定原始拉曼光谱曲线是否具有特征部分，如果不是，则测量样品和增强剂的混合物以获得样品的增强的拉曼光谱曲线; 如果要检查的样本的原始拉曼光谱曲线具有特征部分，则将样品的原始拉曼光谱曲线与药物的原始拉曼光谱数据库中的数据进行比较，以确定样品是否含有药物，否则比较 增强的拉曼光谱曲线的样品与增强的拉曼光谱数据库中的数据，以确定待检样品是否含有药物。

    COMPUTED TOMOGRAPHY DEVICE BASED ON STRAIGHT TRAJECTORY AND X-RAY IMAGING DEVICE
    20.
    发明申请
    COMPUTED TOMOGRAPHY DEVICE BASED ON STRAIGHT TRAJECTORY AND X-RAY IMAGING DEVICE 有权
    基于直线轨道和X射线成像装置的计算机图像设备

    公开(公告)号：US20150085973A1

    公开(公告)日：2015-03-26

    申请号：US14494301

    申请日：2014-09-23

    Applicant: NUCTECH COMPANY LIMITED ,  Tsinghua University

    Inventor： Mingliang Li ,  Zhiqiang Chen ,  Yuanjing Li ,  Jianmin Li ,  Li Zhang

    IPC: G01N23/04 ,  G21K1/02

    CPC classification number: G01N23/046 ,  A61B6/032 ,  A61B6/035 ,  A61B6/06 ,  G01N2223/3301 ,  G01T1/2985 ,  G21K1/025

    Abstract: A straight trajectory CT device can be used in radiation imaging. The device includes: a ray-generating unit that generates a ray within a specific range of field angle; a channel for an object to be inspected though which the object to be inspected passes; a first collimator; and a ray receiving unit provided on both sides of the channel for the object to be inspected. The ray beam is received by the ray receiving unit after penetrating the first collimator and the object to be inspected in order. The ray generating unit is static and the first collimator moves in the same direction as the ray receiving unit. This direction is parallel to the channel for the object to be inspected. The device can complete computed tomography with a minimum of one ray receiving unit, thereby simplifying the structure of the device and reducing its cost.

    Abstract translation: 直线轨迹CT装置可用于放射成像。 该装置包括：射线产生单元，其在特定的场角范围内产生射线; 被检查对象通过的通道; 第一个准直器 以及设置在用于被检查物体的通道两侧的光线接收单元。 射线束在穿透第一准直仪和待检查物体之后被射线接收单元接收。 射线产生单元是静态的，并且第一准直仪沿与射线接收单元相同的方向移动。 该方向与待检查对象的通道平行。 该设备可以用至少一个射线接收单元完成计算机断层摄影，从而简化了设备的结构并降低了其成本。

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