WO2014101593A1 - 人体背散射安检系统 - Google Patents
人体背散射安检系统 Download PDFInfo
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- WO2014101593A1 WO2014101593A1 PCT/CN2013/087513 CN2013087513W WO2014101593A1 WO 2014101593 A1 WO2014101593 A1 WO 2014101593A1 CN 2013087513 W CN2013087513 W CN 2013087513W WO 2014101593 A1 WO2014101593 A1 WO 2014101593A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/203—Measuring back scattering
-
- 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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4021—Arrangements for generating radiation specially adapted for radiation diagnosis involving movement of the focal spot
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4266—Arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a plurality of detector units
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/48—Diagnostic techniques
- A61B6/483—Diagnostic techniques involving scattered radiation
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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
- G01V5/222—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 technology relates to radiation imaging technology, and in particular to a human body backscatter security inspection system, which can improve the speed of security inspection. Background technique
- embodiments of the present invention provide a human body backscatter security inspection system, which can improve the speed of security inspection.
- a human body backscattering security system comprising: a flying spot forming device that outputs an X-ray beam; a plurality of discrete detectors arranged in a longitudinal direction along a longitudinal direction of the object to be inspected; a control device, coupled Receiving the flying spot forming device and the plurality of detectors, generating a control signal, controlling the flying spot forming device and the plurality of detector pairs to perform segmented synchronous scanning on the human body of the object to be inspected in the longitudinal direction.
- the flying spot forming device respectively generates respective X-ray beams for a plurality of segments in the longitudinal direction of the object to be inspected, thereby performing segment-synchronous scanning on the longitudinal direction of the human body of the object to be inspected.
- the human body of the object to be inspected is longitudinally divided into an upper segment and a lower segment, and the plurality of discrete detectors include a first detector, a second detector, and a third detector disposed in order from top to bottom.
- the first X-ray beam scans the upper segment and the second X-ray beam scans the lower segment
- the value detected by the first detector is used as the value of the reflected first X-ray beam
- the second detector and the third detector detect The sum of the values obtained as the value of the reflected second X-ray beam
- the human body of the object to be inspected is longitudinally divided into an upper segment and a lower segment, and the plurality of discrete detectors include a first detector, a second detector, and a third detector disposed in order from top to bottom.
- the upper segment includes a first sub-segment, a second sub-segment, and a third sub-segment
- the value detected by the first detector is reflected a value of the first X-ray beam, a sum of values detected by the second detector, the third detector, and the fourth detector as a value of the reflected second X-ray beam
- the first X-ray beam scans the second sub-segment And the sum of the values detected by the first detector and the second detector as the value of the reflected first X-ray beam, and the sum of the values detected by the third and fourth detectors as the reflected second X-ray beam a value
- a sum of values detected by the first detector, the second detector, and the third detector as a value of the reflected first X-ray beam when the first X-ray beam scans the third sub-segment
- the fourth detector detects The value obtained is taken
- the flying spot forming device has a plurality of small holes having a spiral portion on a cylindrical surface thereof, and is configured to output the first X-ray beam and the second X-ray beam in a time division manner, wherein the first X-ray beam and The second X-ray beam differs by half the period of the beam current as a function of time.
- the flying spot forming device includes a first flying point forming unit and a second flying point forming unit disposed along a longitudinal direction of the human body of the object to be inspected, respectively, on the upper body portion of the object to be inspected and The next section is scanned independently.
- the first flying point forming unit and the second flying point forming unit scan the human body of the object to be inspected in the same direction, and the scanning speed is the same.
- FIG. 1 shows a schematic diagram of a human body backscatter scanning system in accordance with an embodiment of the present invention
- FIG. 2 is a view showing a distribution of scattered signal intensity in a longitudinal direction of a human body during a backscattering human body examination
- FIG. 3 is a view showing a flying spot forming device used in a human body backscatter scanning system according to an embodiment of the present invention.
- FIG. 4 shows an example of a human body backscatter scanning system in accordance with another embodiment of the present invention. detailed description
- an embodiment of the present invention proposes a human body backscattering security inspection system.
- the flying spot forming device outputs an X-ray beam.
- a plurality of discrete detectors are sequentially disposed along the longitudinal direction of the body of the object to be inspected.
- the control device is coupled to the flying spot forming device and the plurality of detectors, generates a control signal, controls the flying spot forming device and the plurality of detectors to perform segmented synchronous scanning on the human body of the object to be inspected in the longitudinal direction.
- the plurality of X-ray beams outputted by the flying spot forming means are scanned for the multi-segment synchronization of the human body, thereby increasing the scanning speed.
- the flying spot forming device respectively generates a corresponding X-ray beam for a plurality of segments (for example, an upper segment and a lower segment) in the longitudinal direction of the object to be inspected
- the plurality of discrete detectors include a first detector and a second device disposed in order from the top to the bottom. detector.
- a segmented synchronous scan is performed on the longitudinal direction of the human body of the object to be inspected. For example, while the first X-ray beam scans the upper segment, the second X-ray beam scans the lower segment, the first detector receives the reflected first X-ray beam, the second detector A reflected second X-ray beam is received.
- the second X-ray beam scans the upper segment
- the first X-ray beam scans the lower segment
- the first detector receives the reflected second X-ray beam
- the second detector receives the reflected first X-ray beam.
- the human body of the object to be inspected may be longitudinally divided into an upper segment and a lower segment, and the plurality of discrete detectors include a first detector, a second detector, and a third detector disposed in order from the top to the bottom.
- the first X-ray beam scans the upper segment and the second X-ray beam scans the lower segment
- the value detected by the first detector serves as the value of the reflected first X-ray beam
- the second detector and the third The sum of the values detected by the detector is taken as the value of the reflected second X-ray beam.
- the sum of the values detected by the first detector and the second detector serves as the value of the reflected second X-ray beam
- the third detector detects The value is taken as the value of the reflected first X-ray beam.
- the human body of the object to be inspected may be longitudinally divided into an upper segment and a lower segment, and the plurality of discrete detectors include a first detector, a second detector, and a third detector disposed in order from top to bottom. And the fourth detector.
- the upper segment includes a first sub-segment, a second sub-segment, and a third sub-segment, and when the first X-ray beam scans the first sub-segment, the value detected by the first detector is used as the first X of the reflection.
- the value of the beam, the sum of the values detected by the second detector, the third detector, and the fourth detector as the value of the reflected second X-ray beam.
- the sum of the values detected by the first detector and the second detector is the value of the reflected first X-ray beam
- the values detected by the third and fourth detectors The sum is the value of the reflected second X-ray beam.
- the sum of the values detected by the first detector, the second detector, and the third detector is the value of the reflected first X-ray beam
- the fourth detector detects The value is taken as the value of the reflected second X-ray beam.
- the above segmentation of the human body is merely an example, and those skilled in the art can divide the human body longitudinally into more segments. Also, in the above examples, the upper and lower sections do not mean that the longitudinal length of the human body is divided into equal two segments, that is, the lengths of the upper segment and the lower segment may be the same or different.
- FIG. 1 shows a schematic diagram of a human body backscatter scanning system in accordance with an embodiment of the present invention.
- the system is a typical lateral translation scanning method.
- the system includes an X-ray machine and a beam collimator 1, a drum flying point device 2, a backscatter detector 3, an inspection interface 5, and a signal acquisition and processing device 6, and the human body of the object to be inspected is segmentally scanned.
- the X-ray machine and the beam collimator 1 and the drum flying point device 2 can be rotated coaxially (or translated), and the backscatter detector 3 can be laterally translated, and the flying spot beam can be scanned up and down.
- the detector 3 includes discrete detectors 301, 302, 303 and 304 arranged in order from top to bottom.
- the backscatter detector 3 and the human body 4 are relatively close together, so that the intensity of the backscattered rays varies greatly in the longitudinal direction of the human body, as shown in FIG. Therefore, the backscatter detector is divided into a plurality of independent detectors 301-304, and the signal strengths received by the near target and the far target backscatter detector are greatly different. Therefore, Simultaneously, multiple scanning points are simultaneously set for synchronous scanning at a certain spatial interval, and multiple backscatter detectors independently acquire data.
- a two-point synchronous scan is taken as an example for detailed discussion, and the human body is divided into an upper segment and a lower segment in the longitudinal direction.
- Independent four sets of detectors 301, 302, 303, 304 are arranged in the longitudinal direction; the two scanning beams 11 and 12 (shown in Figure 1) are in approximately half of the body's separation position.
- the first beam 11 is at A
- the second beam 12 is just at D
- the scanning speed and direction of both sides are the same, that is, when the first beam 11 is swept from A to D, the second beam 12 is just When sweeping from D to E; then the first beam 11 sweeps from D to E, and the second beam 12 returns to point A and sweeps from A to D.
- the signal acquisition can be realized as follows: when the first beam 11 is swept from A to B, the signal of the detector 301 is returned to the first beam 11, and the signals of the detectors 302, 303, 304 can be second to the stream 12; When the first beam 11 sweeps from B to C, the signals of the detectors 301, 302 are returned to the first beam 11, and the signals of the detectors 303, 304 are returned to the second beam 12; the first beam 1 is scanned from C When D is reached, the signals of the detectors 301, 302, 303 are returned to the first beam stream 1, and the signal of the detector 304 is returned to the second beam stream 12; In the actual design, the segmentation of the detector and the processing of the signal can be carried out in various ways, as long as the simultaneous scanning of multiple points can be realized without affecting the quality of the scanned image.
- the flying spot beam is a discontinuous beam.
- a flying spot device has a beamless gap time between the scanning beam point and the point.
- the two-beam alternating simultaneous scanning is performed, that is, one of the bundles is in the bundled state, and the other bundle is in the shielded state, so that the signal interference between the two bundles can be better reduced, and the double-beam synchronous scanning can be realized.
- the flying spot forming device may be formed to include a first flying point forming unit and a second flying point forming unit disposed along a longitudinal direction of the human body of the object to be inspected, respectively for the human body of the object to be inspected
- the upper and lower sections are scanned independently.
- the first flying spot forming unit and the second flying spot forming unit scan the human body of the object to be inspected in the same direction, and the scanning speed is the same.
- Fig. 4 shows an example of a human body backscatter scanning system in accordance with another embodiment of the present invention.
- the vertical scanning mode of the human body as shown in FIG. In the longitudinal direction of the human body, multiple sets of X-ray machine and backscatter detector system are installed, and multiple points are scanned simultaneously in multiple regions. As for how many areas are set, the signal interference between adjacent areas does not affect the image quality and indicators.
- the system includes two sets of devices 7 and 8, each of which includes an X-ray machine, a flying spot device, and a detector.
- Each flying point device scans an interval, of course, as far as possible between them, and both The scanning speed and direction are the same to reduce the information interference between each other; that is, when the device 7 scans from F to G, the device section 8 just scans from the G to the H, and the two sets of devices are only responsible for the respective scanning intervals.
- aspects of the embodiments disclosed herein may be implemented in an integrated circuit as a whole or in part, as one or more of one or more computers running on one or more computers.
- a computer program eg, implemented as one or more programs running on one or more computer systems
- implemented as one or more programs running on one or more processors eg, implemented as one or One or more programs running on a plurality of microprocessors, implemented as firmware, or substantially in any combination of the above, and those skilled in the art, in accordance with the present disclosure, will be provided with design circuitry and/or write software and / or firmware code capabilities.
- signal bearing media include, but are not limited to, recordable media such as floppy disks, hard drives, compact disks (CDs), digital versatile disks (DVDs), digital tapes, computer memories, etc.; and transmission-type media such as digital and / or analog communication media (eg, fiber optic cable, waveguide, wired communication link, wireless communication link, etc.).
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Abstract
一种人体背散射安检系统,包括:飞点形成装置(1,2),输出X射线束;多个分立的探测器(3),沿着被检查对象人体(4)纵向依次设置;控制装置(6),耦接到所述飞点形成装置(1,2)和所述多个探测器(3),产生控制信号,控制所述飞点形成装置(1,2)和多个探测器(3)对所述被检查对象人体(4)沿着纵向进行分段同步扫描。该系统提出多点同步扫描的方式,使人体检查速度大大提高。
Description
人体背散射安检系统 技术领域
本技术涉及辐射成像技术, 具体涉及一种人体背散射安检系统, 能够提高安检的速 度。 背景技术
现有 X射线人体背散射扫描检查装置,均采用单点扫描方式,采用较大的背散射探 测器。技术线路有 X光机和探测器上下同步移动的纵向扫描方式、 X光机同轴转动(或 平移)探测器横向移动的扫描方式。 但无论何种方式, 每一时刻点均只有一个光束照射 到人体表面,因此在不损害图像指标和增加人体受照剂量等前提下,如何提高扫描速度, 是本领域比较关心的问题。 发明内容
针对现有技术中存在的扫描速度不高的问题, 本发明的实施例提供了一种人体背 散射安检系统, 能够提高安检的速度。
在本发明的一个方面, 提出了一种人体背散射安检系统, 包括: 飞点形成装置, 输 出 X射线束; 多个分立的探测器, 沿着被检查对象人体纵向依次设置; 控制装置, 耦接 到所述飞点形成装置和所述多个探测器, 产生控制信号, 控制所述飞点形成装置和多个 探测器对对所述被检查对象人体沿着纵向进行分段同步扫描。
根据本发明的实施例,所述飞点形成装置针对所述被检查对象纵向的多个段分别产 生相应的 X射线束, 从而对所述被检查对象的人体纵向进行分段同步扫描。
根据本发明的实施例, 所述被检查对象的人体纵向分成上段和下段, 所述多个分立 的探测器包括从上向下依次设置的第一探测器和第二探测器,其中, 当第一 X射线束扫 描上段的同时, 第二 X射线束扫描下段, 所述第一探测器接收反射的第一 X射线束, 所述第二探测器接收反射的第二 X射线束。
根据本发明的实施例, 所述被检查对象的人体纵向分成上段和下段, 所述多个分立 的探测器包括从上向下依次设置的第一探测器和第二探测器,其中, 当第二 X射线束扫 描上段的同时, 第一 X射线束扫描下段, 所述第一探测器接收反射的第二 X射线束,
所述第二探测器接收反射的第一 X射线束。
根据本发明的实施例, 所述被检查对象的人体纵向分成上段和下段, 所述多个分立 的探测器包括从上向下依次设置的第一探测器、 第二探测器和第三探测器, 其中, 当第 一 X射线束扫描上段且第二 X射线束扫描下段时, 第一探测器探测到的值作为反射的 第一 X射线束的值, 第二探测器和第三探测器探测到的值之和作为反射的第二 X射线 束的值;
当第一 X射线束扫描下段且第二 X射线束扫描上段时, 第一探测器和第二探测器 探测到的值之和作为反射的第二 X射线束的值,第三探测器探测到值作为反射的第一 X 射线束的值。
根据本发明的实施例, 所述被检查对象的人体纵向分成上段和下段, 所述多个分立 的探测器包括从上向下依次设置的第一探测器、第二探测器、第三探测器和第四探测器, 其中所述上段包括第一子段、 第二子段和第三子段, 当第一 X射线束扫描第一子段时, 第一探测器探测到的值作为反射的第一 X射线束的值,第二探测器、第三探测器和第四 探测器探测到的值之和作为反射的第二 X射线束的值; 当第一 X射线束扫描第二子段 时,第一探测器和第二探测器探测到的值之和作为反射的第一 X射线束的值,第三和第 四探测器探测到的值之和作为反射的第二 X射线束的值; 当第一 X射线束扫描第三子 段时,第一探测器、第二探测器和第三探测器探测的值之和作为反射的第一 X射线束的 值, 第四探测器探测到的值作为反射的第二 X射线束的值。
根据本发明的实施例, 飞点形成装置在其圆柱表面具有螺旋部分的多个小孔, 并且 被配置为分时输出第一 X射线束和第二 X射线束, 其中第一 X射线束和第二 X射线束 相差束流强度随时间变化的周期的一半。
根据本发明的实施例,所述飞点形成装置包括沿着被检查对象的人体纵向方向设置 的第一飞点形成单元和第二飞点形成单元, 分别对所述被检查对象的人体上段和下段进 行独立扫描。
根据本发明的实施例, 所述第一飞点形成单元和所述第二飞点形成单元沿着相同 的方向对所述被检查对象的人体进行扫描, 并且扫描速度相同。
利用上述方案, 多个人体扫描设备同时对人体进行分段扫描, 实现了多点同步扫 描, 使人体检查速度大大提高。 附图说明
下面的附图表明了本技术的实施方式。 这些附图和实施方式以非限制性、 非穷举性 的方式提供了本技术的一些实施例, 其中:
图 1示出了根据本发明实施例的人体背散射扫描系统的示意图;
图 2示出了在背散射人体检查过程中散射信号强度随着人体的纵向的分布图; 图 3示出了根据本发明实施例的人体背散射扫描系统中使用的飞点形成装置的示意 图; 以及
图 4示出了根据本发明另一实施例的人体背散射扫描系统的例子。 具体实施方式
下面将详细描述本发明的具体实施例, 应当注意, 这里描述的实施例只用于举例说 明, 并不用于限制本发明。 在以下描述中, 为了提供对本发明的透彻理解, 阐述了大量 特定细节。 然而, 对于本领域普通技术人员显而易见的是: 不必采用这些特定细节来实 行本发明。在其他实例中, 为了避免混淆本发明, 未具体描述公知的结构、材料或方法。
在整个说明书中, 对"一个实施例"、 "实施例"、 "一个示例"或"示例"的提及意味着: 结合该实施例或示例描述的特定特征、 结构或特性被包含在本发明至少一个实施例中。 因此, 在整个说明书的各个地方出现的短语"在一个实施例中"、 "在实施例中"、 "一个示 例"或"示例"不一定都指同一实施例或示例。 此外, 可以以任何适当的组合和 /或子组合 将特定的特征、 结构或特性组合在一个或多个实施例或示例中。 此外, 本领域普通技术 人员应当理解,这里使用的术语"和 /或"包括一个或多个相关列出的项目的任何和所有组 合。 针对现有技术中存在的背散射检查系统扫描速度不高的问题,本发明的实施例提出 了一种人体背散射安检系统。在该系统中, 飞点形成装置输出 X射线束。 多个分立的探 测器沿着被检查对象人体纵向依次设置。 控制装置耦接到飞点形成装置和多个探测器, 产生控制信号,控制飞点形成装置和多个探测器对对被检查对象人体沿着纵向进行分段 同步扫描。这样, 飞点形成装置输出的多个 X射线束针对人体的多段同步进行扫描, 从 而提高了扫描速度。
例如, 飞点形成装置针对被检查对象纵向的多个段(例如上段和下段)分别产生相 应的 X射线束, 多个分立的探测器包括从上向下依次设置的第一探测器和第二探测器。 对被检查对象的人体纵向进行分段同步扫描。 例如, 当第一 X射线束扫描上段的同时, 第二 X射线束扫描下段, 所述第一探测器接收反射的第一 X射线束, 所述第二探测器
接收反射的第二 X射线束。 再如, 当第二 X射线束扫描上段的同时, 第一 X射线束扫 描下段, 第一探测器接收反射的第二 X射线束, 第二探测器接收反射的第一 X射线束。
在其他实施例中, 也可以将被检查对象的人体纵向分成上段和下段, 而多个分立的 探测器包括从上向下依次设置的第一探测器、第二探测器和第三探测器。在这种情况下, 当第一 X射线束扫描上段且第二 X射线束扫描下段时, 第一探测器探测到的值作为反 射的第一 X射线束的值, 第二探测器和第三探测器探测到的值之和作为反射的第二 X 射线束的值。 当第一 X射线束扫描下段且第二 X射线束扫描上段时, 第一探测器和第 二探测器探测到的值之和作为反射的第二 X射线束的值,第三探测器探测到值作为反射 的第一 X射线束的值。
在另外的实施例中, 也可以将被检查对象的人体纵向分成上段和下段, 而多个分立 的探测器包括从上向下依次设置的第一探测器、第二探测器、第三探测器和第四探测器。 在这种情况下, 上段包括第一子段、第二子段和第三子段, 当第一 X射线束扫描第一子 段时, 第一探测器探测到的值作为反射的第一 X射线束的值, 第二探测器、第三探测器 和第四探测器探测到的值之和作为反射的第二 X射线束的值。 当第一 X射线束扫描第 二子段时,第一探测器和第二探测器探测到的值之和作为反射的第一 X射线束的值,第 三和第四探测器探测到的值之和作为反射的第二 X射线束的值。 当第一 X射线束扫描 第三子段时,第一探测器、第二探测器和第三探测器探测的值之和作为反射的第一 X射 线束的值, 第四探测器探测到的值作为反射的第二 X射线束的值。
上述对人体的分段仅仅是一个例子, 本领域的技术人员可以将人体纵向分成更多 段。并且,在上述的例子中,上段和下段并不意味着将人体纵向长度划分成相等的两段, 也就是说, 上段和下段的长度可以相同也可以不同。
图 1示出了根据本发明实施例的人体背散射扫描系统的示意图。 如图 1所示, 该 系统是通常的横向平移扫描方式。该系统包括 X光机及束流准直器 1、转筒飞点装置 2、 背散射探测器 3、检查界面 5、和信号采集处理装置 6, 对被检查对象 4人体进行分段扫 描。 X光机及束流准直器 1和转筒飞点装置 2可以同轴转动(或平移), 背散射探测器 3 可以横向平移, 飞点束流进行上下扫描。
如图 1所示, 探测器 3包括从上向下依次设置的分立的探测器 301、 302、 303和 304。 通常, 背散射探测器 3和人体 4比较贴近, 致使背向散射回来的射线强度在人体 纵向方向的强度分布有很大变化, 如附图 2所示。 因此将背散射探测器分割成多个独立 探测器 301-304, 近靶点和远靶点背散射探测器接收到的信号强度相差极大。 鉴于此,
在一定的空间间隔下同时设置多个扫描点进行同步扫描, 而多个背散射探测器独立采集 数据。
在一些实施例中, 以两点同步扫描为例进行详细论述, 相应地将人体沿纵向划分 为上段和下段。 在纵向设置独立四组探测器 301、 302、 303、 304; 两扫描束流 11和 12 (如图 1所示) 处于人体大概一半的分离位。 如第一束流 11在 A处时, 第二束流 12 刚好在 D处, 并且双方的扫描速度和方向一致, 也即第一束流 11从 A扫到 D时, 第二 束流 12刚好在从 D处扫到 E时; 接着第一束流 11从 D扫到 E时, 第二束流 12则回到 A点并从 A处扫到 D时。信号采集可以这样实现: 第一束流 11从 A扫到 B时, 将探测 器 301的信号归第一束流 11, 而探测器 302、 303、 304的信号均可以第二归束流 12; 第一束流 11从 B扫到 C时, 将探测器 301、 302的信号归第一束流 11, 而探测器 303、 304的信号归第二束流 12; 第一束流 1从 C扫到 D时, 将探测器 301、 302、 303的信 号归第一束流 1, 而探测器 304的信号归第二束流 12; 如此交替反复。 在实际设计中, 探测器的分割、 信号的处理可以有多种方案, 只要能实现多点同时扫描和不影响扫描图 像质量即可。
根据一些实施例, 飞点形成装置可以在其圆柱表面具有螺旋部分的多个小孔, 并且 被配置为分时输出多个 X射线束, 例如第一和第二 X射线束, 其中第一 X射线束和第 二 X射线束相差束流强度随时间变化的周期的一半。
例如, 作为人体背散射检查装置的例子, 飞点束流为非连续束流如图 3所示点状 的飞点装置, 扫描束流点与点之间存在无束间隙时间, 本申请的实施例利用该条件进行 双束交替同时扫描, 即其中一束处于出束时, 另一束当好处于屏蔽状态, 如此能更好地 减少双束间的信号干扰, 实现双束同步扫描。
在另一些实施例中,可以将飞点形成装置形成为包括沿着被检查对象的人体纵向方 向设置的第一飞点形成单元和第二飞点形成单元, 分别对所述被检查对象的人体上段和 下段进行独立扫描。 在这种情况下, 第一飞点形成单元和第二飞点形成单元沿着相同的 方向对被检查对象的人体进行扫描, 并且扫描速度相同。 图 4示出了根据本发明另一实 施例的人体背散射扫描系统的例子。 如图 4所示的人体纵向扫描方式。 在人体纵向设置 多套 X光机和背散探测器系统, 分区域多点同时扫描, 至于设置多少个区域, 以相邻区 域间信号干扰不影响图像质量和指标为准。
以两点同步扫描为例, 该系统包含两套设备 7和 8, 每套设备包括 X光机、 飞点 装置和探测器。 每个飞点装置扫描一个区间, 当然它们之间尽可能地远离, 并且双方的
扫描速度和方向一致, 以减少彼此间的信息干扰; 即设备 7从 F处扫描到 G处时, 设备 部 8刚好从 G处扫描到 H处, 并且两套设备只负责各自的扫描区间。
以上的详细描述通过使用示意图、 流程图和 /或示例, 已经阐述了人体背散射安检 系统的众多实施例。 在这种示意图、 流程图和 /或示例包含一个或多个功能和 /或操作的 情况下, 本领域技术人员应理解, 这种示意图、流程图或示例中的每一功能和 /或操作可 以通过各种结构、硬件、 软件、 固件或实质上它们的任意组合来单独和 /或共同实现。在 一个实施例中, 本发明的实施例所述主题的若干部分可以通过专用集成电路 (ASIC)、 现场可编程门阵列 (FPGA)、 数字信号处理器 (DSP)、 或其他集成格式来实现。 然而, 本领域技术人员应认识到,这里所公开的实施例的一些方面在整体上或部分地可以等同 地实现在集成电路中, 实现为在一台或多台计算机上运行的一个或多个计算机程序(例 如, 实现为在一台或多台计算机系统上运行的一个或多个程序), 实现为在一个或多个 处理器上运行的一个或多个程序(例如, 实现为在一个或多个微处理器上运行的一个或 多个程序), 实现为固件, 或者实质上实现为上述方式的任意组合, 并且本领域技术人 员根据本公开, 将具备设计电路和 /或写入软件和 /或固件代码的能力。 此外, 本领域技 术人员将认识到, 本公开所述主题的机制能够作为多种形式的程序产品进行分发, 并且 无论实际用来执行分发的信号承载介质的具体类型如何,本公开所述主题的示例性实施 例均适用。 信号承载介质的示例包括但不限于: 可记录型介质, 如软盘、 硬盘驱动器、 紧致盘 (CD)、 数字通用盘 (DVD)、 数字磁带、 计算机存储器等; 以及传输型介质, 如数字和 /或模拟通信介质(例如, 光纤光缆、 波导、 有线通信链路、 无线通信链路等)。
虽然已参照几个典型实施例描述了本发明, 但应当理解, 所用的术语是说明和示 例性、 而非限制性的术语。 由于本发明能够以多种形式具体实施而不脱离发明的精神或 实质, 所以应当理解, 上述实施例不限于任何前述的细节, 而应在随附权利要求所限定 的精神和范围内广泛地解释, 因此落入权利要求或其等效范围内的全部变化和改型都应 为随附权利要求所涵盖。
Claims
1、 一种人体背散射安检系统, 包括:
飞点形成装置, 输出 X射线束;
多个分立的探测器, 沿着被检查对象人体纵向依次设置;
控制装置, 耦接到所述飞点形成装置和所述多个探测器, 产生控制信号, 控制所 述飞点形成装置和多个探测器对对所述被检查对象人体沿着纵向进行分段同步扫描。
2、 如权利要求 1所述的安检系统, 其中所述飞点形成装置针对所述被检查对象纵 向的多个段分别产生相应的 X射线束,从而对所述被检查对象的人体纵向进行分段同步 扫描。
3、 如权利要求 2所述的安检系统, 其中所述被检查对象的人体纵向分成上段和下 段, 所述多个分立的探测器包括从上向下依次设置的第一探测器和第二探测器,
其中, 当第一 X射线束扫描上段的同时, 第二 X射线束扫描下段, 所述第一探测 器接收反射的第一 X射线束, 所述第二探测器接收反射的第二 X射线束。
4、 如权利要求 2所述的安检系统, 其中所述被检查对象的人体纵向分成上段和下 段, 所述多个分立的探测器包括从上向下依次设置的第一探测器和第二探测器,
其中, 当第二 X射线束扫描上段的同时, 第一 X射线束扫描下段, 所述第一探测 器接收反射的第二 X射线束, 所述第二探测器接收反射的第一 X射线束。
5、 如权利要求 2所述的安检系统, 其中所述被检查对象的人体纵向分成上段和下 段, 所述多个分立的探测器包括从上向下依次设置的第一探测器、 第二探测器和第三探 测器,
其中, 当第一 X射线束扫描上段且第二 X射线束扫描下段时, 第一探测器探测到 的值作为反射的第一 X射线束的值,第二探测器和第三探测器探测到的值之和作为反射 的第二 X射线束的值;
当第一 X射线束扫描下段且第二 X射线束扫描上段时, 第一探测器和第二探测器 探测到的值之和作为反射的第二 X射线束的值,第三探测器探测到值作为反射的第一 X 射线束的值。
6、 如权利要求 2所述的安检系统, 其中所述被检查对象的人体纵向分成上段和下 段, 所述多个分立的探测器包括从上向下依次设置的第一探测器、 第二探测器、 第三探 测器和第四探测器,
其中所述上段包括第一子段、 第二子段和第三子段, 当第一 X射线束扫描第一子 段时, 第一探测器探测到的值作为反射的第一 X射线束的值, 第二探测器、第三探测器 和第四探测器探测到的值之和作为反射的第二 X射线束的值;
当第一 X射线束扫描第二子段时, 第一探测器和第二探测器探测到的值之和作为 反射的第一 X射线束的值, 第三和第四探测器探测到的值之和作为反射的第二 X射线 束的值;
当第一 X射线束扫描第三子段时, 第一探测器、 第二探测器和第三探测器探测的 值之和作为反射的第一 X射线束的值, 第四探测器探测到的值作为反射的第二 X射线 束的值。
7、 如权利要求 2所述的安检系统, 其中飞点形成装置在其圆柱表面具有螺旋部分 的多个小孔, 并且被配置为分时输出第一 X射线束和第二 X射线束, 其中第一 X射线 束和第二 X射线束相差束流强度随时间变化的周期的一半。
8、 如权利要求 1所述的安检系统, 其中所述飞点形成装置包括沿着被检查对象的 人体纵向方向设置的第一飞点形成单元和第二飞点形成单元, 分别对所述被检查对象的 人体上段和下段进行独立扫描。
9、 如权利要求 8所述的安检系统, 其中所述第一飞点形成单元和所述第二飞点形 成单元沿着相同的方向对所述被检查对象的人体进行扫描, 并且扫描速度相同。
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| US9366642B2 (en) | 2016-06-14 |
| CN103901491A (zh) | 2014-07-02 |
| GB2509395A (en) | 2014-07-02 |
| GB201322302D0 (en) | 2014-01-29 |
| EP2749902A1 (en) | 2014-07-02 |
| EP2749902B1 (en) | 2018-04-25 |
| GB2509395B (en) | 2015-05-20 |
| CN103901491B (zh) | 2017-10-17 |
| US20140185769A1 (en) | 2014-07-03 |
| DE202013011510U1 (de) | 2014-02-04 |
| PL2749902T3 (pl) | 2018-10-31 |
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