WO2014101591A1 - 检查系统和检查方法 - Google Patents

检查系统和检查方法 Download PDF

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Publication number
WO2014101591A1
WO2014101591A1 PCT/CN2013/087504 CN2013087504W WO2014101591A1 WO 2014101591 A1 WO2014101591 A1 WO 2014101591A1 CN 2013087504 W CN2013087504 W CN 2013087504W WO 2014101591 A1 WO2014101591 A1 WO 2014101591A1
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Prior art keywords
source
radiation
detector
inspection
inspection system
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PCT/CN2013/087504
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English (en)
French (fr)
Inventor
陈志强
李元景
赵自然
吴万龙
唐乐
刘以农
金颖康
丁光伟
曹硕
郑志敏
刘文国
俞文涛
周奕
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Tsinghua University
Nuctech Co Ltd
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Tsinghua University
Nuctech Co Ltd
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Publication of WO2014101591A1 publication Critical patent/WO2014101591A1/zh
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
    • G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
    • G01V5/226—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays using tomography
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G01T1/167—Measuring radioactive content of objects, e.g. contamination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
    • G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
    • G01V5/222—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays measuring scattered radiation

Definitions

  • the present invention relates to an inspection system and an inspection method, particularly an inspection system and inspection method for a human body. Background technique
  • the ray is modulated and collimated into a beam-by-point scanning object, and the detector receives the ray scattered back on the object.
  • the scanning position and the signal point are corresponding to obtain the back of the object information. Scattered image.
  • the commonly used scanning mode is: the ray pen beam is scanned in the first dimension by the modulation collimation; the ray pen beam plane is relatively translated with the human body along the second dimension direction; the first dimension direction and the second dimension direction Roughly vertical.
  • the disadvantage of this scanning mode is that one scanning detection can only obtain the image of the body of the inspected person close to the detector side, while the other side is a blind area and cannot scan; to eliminate the blind area and obtain a complete human body image, the inspected person must After a scan is completed, it is rotated 180° for the second scan, that is, two scans are required; the turning action increases the invalid detection time and reduces the detection pass rate as a whole.
  • the typical time for single-sided scanning is about 10 seconds, and it is usually 1.5 seconds to 2 seconds when the operator informs the inspected person that he can turn to the actual turn and reset the posture.
  • an inspection system comprising: a radiation source for emitting radiation; a detector for receiving radiation; a detection area for placing an object to be inspected; A moving device that moves the source and detector around the detection zone.
  • the source of radiation comprises a plurality of targets arranged in a vertical direction, or may be a distributed X-ray source.
  • the moving device includes a guide rail, and the radiation source and the detector move along the guide rail.
  • the guide rail is circular or elliptical.
  • the guide rail is a closed loop.
  • the radiation source and the detector are formed in one body.
  • the present invention provides an inspection method, the inspection method comprising the steps of: placing an object to be inspected in a detection area; moving the radiation source and the detector around the detection area while causing the radiation source to emit radiation And use the detector to receive the radiation scattered from the object being inspected.
  • the radiation source emits a beam of light for scanning
  • the moving device moves the source and detector around the detection zone.
  • a curved moving scan path is employed, and common scanning blind spots, such as sides of the body, sides of the hands and legs, etc., can be completely eliminated by the method of the present invention.
  • the target human body to make a change of posture such as turning, which can minimize the invalid time of the whole detection and improve the passing rate of the detected personnel; and can also greatly improve the psychological state of the detected person caused by changing the posture. Being controlled to reduce their psychological discomfort and resistance.
  • DRAWINGS 1 is a schematic diagram of an inspection system in accordance with an embodiment of the present invention. detailed description
  • an inspection system 10 includes: a radiation source 1 for emitting radiation; a detector 2 for receiving radiation; and an object 5 for placing an object to be inspected (for example, for standing The inspection area 6 of the inspector; the mobile device 12 for moving the radiation source 1 and the detector 2 around the detection zone 6, and the control unit 4 for controlling the system.
  • the source of radiation and the detector can be formed in one piece.
  • the inspection system 10 can be a radiographic imaging system.
  • the mobile device 12 can rotate the source 1 and detector 2 around the detection zone 6.
  • the moving device causes the source and detector to integrally rotate about the vertical axis about the detection zone.
  • the mobile device 12 can be any suitable mobile device, as long as the source 1 and detector 2 can be rotated about the detection zone 6, the object of the invention can be achieved.
  • the X-ray source 1 may be a distributed ray source, such as a carbon nanotube X-ray source, and may have a plurality of exit targets 101.
  • the ray source 1 may include a plurality of targets arranged in a vertical direction. Point 101.
  • the number of targets is not limited, and the number depicted in the drawings is for illustrative purposes only and does not imply that the actual limitation is limited.
  • Each target has the ability to independently emit radiation and can be individually controlled to emit radiation in a specific order.
  • the X-ray source 1 can be a stack of multiple X-ray sources, such as a conventional field-induced X-ray tube, or other suitable source of isotope radiation, such as a gamma ray source or the like.
  • the detector 2 can absorb X-rays into electrical signals and further convert them into digital signals that can be used for computer display.
  • the X-ray source 1 and the detector 2 can be fixed by means of a connecting rod and a screw, and remain in a relative position while moving.
  • the detector 2 is a plastic scintillator detector or a semiconductor scintillator detector.
  • the mobile device 12 includes a guide rail 3 on which the radiation source 1 and the detector 2 move.
  • the guide rail 3 can be an arcuate guide rail.
  • the rails can be circular or elliptical.
  • the curved guide 3 provides a path of movement of the X-ray source 1 and the detector 2 in the horizontal direction.
  • the curved guide rail can be a closed loop or a part of the closed loop.
  • the guide rails can also be other curved guide rails.
  • the control unit 4 can control the beam-out timing of the X-ray source 1, so that the plurality of targets 101 of the X-ray source 1 can be sequentially discharged in order, and strictly ensure that only one target is applied at any time. Point out in the bundle to form a unique flying spot scan. For example, multiple on the source 1 The target 101 can be sequentially beamed to form a flying spot scan. Alternatively, a plurality of target points 101 on the source 1 can be spaced apart to form a flying spot scan. Still further, the plurality of targets 101 on the source 1 can be beamed in a particular programmable order to form a flying spot scan.
  • the control unit 4 can also control the movement of both the X-ray source 1 and the detector 2 along the curved guide rail 3.
  • the inspection method includes the steps of: placing an object to be inspected in a detection area; moving the radiation source and the detector around the detection area while causing the radiation source to emit radiation, and receiving the scattering from the object to be inspected by the detector. Rays.
  • the source of radiation can emit a bundle of rays for scanning, and the moving device can move the source and detector around the detection zone.
  • the inspected person 5 enters the detection area 6 and stands still; the control unit 4 controls the plurality of target points 101 of the X-ray source 1 to be sequentially, intermittently or in a programmable order in the vertical direction, in the vertical direction.
  • a uniform scanning of the target human body 5 is achieved; the control unit 4 drives the X-ray source 1 and the detector 2 as a whole to move along the curved guide rail 3 according to a preset speed; and the timing of the control unit 4 according to the control X-ray source 1 Frequency, the control detector 2 performs signal acquisition according to the corresponding frequency; when the X-ray source 1 and the detector 2 as a whole complete the entire process of the curved guide rail 3, the entire human body scan is completed, and the inspected person 5 leaves the detection area 6, without Make a change in posture, such as turning around.
  • the method of the present invention employs a curved moving scan path, and common scanning dead zones, such as the sides of the body, the sides of the hands and legs, etc., can be completely eliminated by the method of the present invention.
  • the workflow described by the present invention does not require the target human body to make a change of posture such as turning, which can minimize the invalid time of the entire detection and improve the passing rate of the detected personnel; and can also greatly improve the detected condition caused by changing the posture.
  • the psychologically controlled feelings of the personnel reduce their psychological discomfort and resistance.
  • the target switching with the distributed X-ray source replaces the mechanical movement of the traditional flying point scanning direction, and the target switching can be realized only by a specific timing control signal, which greatly simplifies the complicated mechanical structure of the motor driving, and Easy to control scanning speed.

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  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Health & Medical Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Molecular Biology (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • General Health & Medical Sciences (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)

Abstract

一种检查系统，该检查系统包括：用于发出射线的射线源（1）；用于接收射线的探测器（2）；用于放置被检查物体（5）的检测区（6）；以及用于所述射线源（1）和探测器（2）围绕检测区（6）移动的移动装置（12）。本系统可以彻底消除常见的扫描盲区。无需目标人体做出转身等改变姿态的动作，最大程度地减少整个检测的无效时间，提高检测的人员通过率；同时也能极大改善由于改变姿态造成的被检测人员心理上的被控制感受，降低其心理不适和抵触情绪。

Description

检査系统和检査方法 本申请要求 2012年 12月 27日提交的、 申请号为 201210581760.7、 发明名 称为 "检查系统和检查方法"的中国专利申请的优先权， 其全部内容通过引用结 合在本申请中。 技术领域
本发明涉及一种检查系统和一种检查方法，特别是用于人体的检查系统和检 查方法。 背景技术
背散射检测成像应用中，射线经调制准直成为射线笔束逐点扫描物体， 同时 探测器接收物体上散射回来的射线，数据处理时将扫描位置和信号点点对应即可 得到反映物体信息的背散射图像。
通常采用的扫描模式是： 射线笔束经调制准直在第一维方向扫描； 射线笔束 平面随着探测器一起沿着第二维方向与人体相对平移；第一维方向与第二维方向 大致垂直。
典型的有两种方法： 一种是射线笔束在水平方向扫描，射线笔束平面沿垂直 方向平移； 另一种是射线笔束在垂直方向扫描， 射线笔束平面沿水平方向平移。
该扫描模式的缺点是一次扫描检测只能得到被检查人员的靠近探测器一面 身体的图像， 而另一面身体是盲区， 无法扫描； 要想消除盲区， 获取完整的人体 图像， 被检查人员须在一次扫描完成后转身 180° 进行第二次扫描才行， 即需要 两次扫描检测； 转身动作会增加无效的检测时间， 整体上降低检测通过率。例如 单面扫描典型时间为 10秒左右， 而从操作者通知被检查人员可以转身到实际转 身并重新摆好姿势站定费时通常在 1.5秒至 2秒， 另外操作者确认被检查人员已 经站定又需花 0.5秒至 1秒左右； 这样无效的检测时间就占到了 20%至 30%; 如 果被检查人员行动迟缓或者交流迟缓会造成更多的无效时间。
该扫描模式的另一缺点是即使进行了两次扫描检测，但由于扫描束面和探测 器是直线移动， 使得人体上总会存在与扫描束面平行的表面， 至始至终不能被清 晰地扫描，仍然存在小部分的扫描盲区，例如人体的两肋、腿的左右两侧等部位。 发明内容
本发明的目的是提供一种检查系统和一种检查方法， 由此能够对人体快速 完整扫描且无盲区。
根据本发明的一方面， 本发明提供了一种检查系统， 该检查系统包括： 用 于发出射线的射线源； 用于接收射线的探测器； 用于放置被检查物体的检测区； 以及用于使所述射线源和探测器围绕检测区移动的移动装置。
根据本发明的一方面， 所述射线源包括在垂直方向上排列的多个靶点， 或 者可以是分布式 X射线源。
根据本发明的一方面， 所述移动装置包括导轨， 所述射线源和探测器沿所 述导轨移动。
根据本发明的一方面， 所述导轨是圆形或椭圆形的。
根据本发明的一方面， 所述导轨是闭合环。
根据本发明的一方面， 所述射线源和探测器形成为一体。
根据本发明的一方面， 本发明提供了一种检查方法， 所述检查方法包括如 下步骤： 将被检查物体置于检测区； 使射线源和探测器围绕检测区移动， 同时使 射线源发出射线， 并用探测器接收从被检查物体散射的射线。
根据本发明的一方面， 所述射线源发出用于进行扫描的射线笔束， 并且所 述移动装置使所述射线源和探测器围绕检测区移动。
根据本发明的实施方式， 采用了弧形的移动扫描路径， 常见的扫描盲区一 一例如身体两侧、手腿两侧等一可被本发明的方法彻底消除。此外， 无须目标 人体做出转身等改变姿态的动作，这能最大程度地减少整个检测的无效时间，提 高检测的人员通过率；同时也能极大改善由于改变姿态造成的被检测人员心理上 的被控制感受， 降低其心理不适和抵触情绪。
再者， 用分布式 X射线源的靶点切换代替了传统的飞点扫描方向的机械移 动，靶点切换只需加以特定时序的控制信号即可实现， 大大简化了电机驱动的复 杂机械结构， 且对扫描速度易于控制。 附图说明 图 1是根据本发明的实施例的检查系统的示意图。 具体实施方式
下面结合附图及具体实施例对本发明做进一步说明。
如图 1所示， 根据本发明的实施例的检查系统 10包括： 用于发出射线的射 线源 1 ; 用于接收射线的探测器 2; 用于放置被检查物体 5 (例如， 用于站立被 检查人员） 的检测区 6; 用于使射线源 1和探测器 2围绕检测区 6移动的移动装 置 12，以及用于对系统进行控制的控制部件 4。射线源和探测器可以形成为一体。 检查系统 10可以是射线成像的人体检查系统。
移动装置 12可以使射线源 1和探测器 2围绕检测区 6转动。 例如， 移动装 置使射线源和探测器一体地围绕检测区大致绕竖直轴线转动。 移动装置 12可以 是任何合适的移动装置，只要能够使射线源 1和探测器 2围绕检测区 6转动就可 以实现本发明的目的。
如图 1所示， X射线源 1可以是分布式射线源， 例如碳纳米管 X射线源， 可以具有多个出射靶点 101， 例如， 射线源 1可以包括在垂直方向上排列的多个 靶点 101。 靶点的数量没有限制， 附图所绘的数量仅用于示意， 并不表示实际局 限于此。每个靶点都具有独立出射射线的能力， 并可由外部控制信号控制按照特 定的顺序单独出射射线。 在一种实施例中， X射线源 1可以是多个 X射线源的叠 力口， 例如普通场致 X射线管， 或其他适宜的同位素射线源， 例如伽马射线源等。
探测器 2能吸收 X射线转成电信号， 并进一步转换成能用于计算机显示的 数字信号。 X射线源 1和探测器 2可以通过连杆和螺钉固定， 在移动时保持相对 位置不变。在一种实施例中，探测器 2为塑料闪烁体探测器或半导体闪烁体探测 器。
移动装置 12包括导轨 3， 射线源 1和探测器 2沿导轨移动。 导轨 3可以是 弧形导轨。 导轨可以是圆形或椭圆形的。 弧形导轨 3提供了 X射线源 1和探测 器 2在水平方向上的移动路径。弧形导轨可以是闭合环， 也可以是闭合环的一部 分。 导轨也可以是其它曲线形状的导轨。
控制部件 4， 例如 PLC控制电路微处理器等， 能控制 X射线源 1的出束时 序， 使得 X射线源 1的多个靶点 101能按照顺序依次出束， 并且严格保证任意 时刻只有一个靶点在出束， 以此形成特有的飞点扫描。例如， 射线源 1上的多个 靶点 101能够依次出束， 以形成飞点扫描。 可选地， 射线源 1上的多个靶点 101 能够间隔出束， 以形成飞点扫描。 更进一步地， 射线源 1上的多个靶点 101能够 以特定的可编程次序出束， 以形成飞点扫描。 控制部件 4也能控制 X射线源 1 和探测器 2两者一起沿弧形导轨 3的移动。
下面描述根据本发明的实施例的检查方法。
根据本发明的实施例的检查方法包括如下步骤： 将被检查物体置于检测区； 使射线源和探测器围绕检测区移动， 同时使射线源发出射线， 并用探测器接收从 被检查物体散射的射线。射线源可以发出用于进行扫描的射线笔束， 并且移动装 置可以使射线源和探测器围绕检测区移动。
如图 1所示， 被检查人员 5进入检测区 6， 站立不动； 控制部件 4控制 X射 线源 1的多个靶点 101沿着垂直方向依次、间隔或者可编程次序出束，在垂直方 向上实现对目标人体 5的匀速扫描； 控制部件 4按照预先设定的速度驱动 X射 线源 1和探测器 2整体沿着弧形导轨 3移动； 控制部件 4根据控制 X射线源 1 出束的时序频率， 控制探测器 2按照对应的频率进行信号采集； 当 X射线源 1 和探测器 2整体走完弧形导轨 3的全程， 整个人体扫描也就完成， 被检查人员 5 离开检测区 6， 无须做出转身等改变姿态的动作。
本发明的方法采用了弧形的移动扫描路径，常见的扫描盲区——例如身体两 侧、 手腿两侧等——可被本发明的方法彻底消除。
本发明描述的工作流程无须目标人体做出转身等改变姿态的动作，这能最大 程度地减少整个检测的无效时间，提高检测的人员通过率； 同时也能极大改善由 于改变姿态造成的被检测人员心理上的被控制感受， 降低其心理不适和抵触情 绪。
此外， 用分布式 X射线源的靶点切换代替了传统的飞点扫描方向的机械移 动，靶点切换只需加以特定时序的控制信号即可实现， 大大简化了电机驱动的复 杂机械结构， 且对扫描速度易于控制。

Claims

权利 要 求
1 . 一种检查系统， 包括：
用于发出射线的射线源；
用于接收射线的探测器；
用于放置被检查物体的检测区； 以及
用于使所述射线源和探测器围绕检测区移动的移动装置。
2. 根据权利要求 1所述的检查系统， 其中
所述射线源包括在垂直方向上排列的多个靶点。
3. 根据权利要求 1所述的检查系统， 其中
所述移动装置包括导轨， 所述射线源和探测器沿所述导轨移动。
4. 根据权利要求 3所述的检查系统， 其中
所述导轨是圆形或椭圆形的。
5. 根据权利要求 3所述的检查系统， 其中
所述导轨是闭合环。
6. 根据权利要求 1所述的检查系统， 其中
所述射线源和探测器形成为一体。
7. 根据权利要求 1所述的检查系统， 其中
所述射线源是分布式 X射线源。
8. 一种检查方法， 包括如下步骤：
将被检查物体置于检测区；
使射线源和探测器围绕检测区移动， 同时使射线源发出射线， 并用探测器 接收从被检查物体散射的射线。
9. 根据权利要求 8所述的检查方法， 其中
所述射线源发出用于进行扫描的射线笔束， 并且同时所述移动装置使所述 射线源和探测器围绕检测区移动。
PCT/CN2013/087504 2012-12-27 2013-11-20 检查系统和检查方法 Ceased WO2014101591A1 (zh)

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