CN102565102B - Liquid item inspection method and equipment - Google Patents

Liquid item inspection method and equipment Download PDF

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CN102565102B
CN102565102B CN 201110392191 CN201110392191A CN102565102B CN 102565102 B CN102565102 B CN 102565102B CN 201110392191 CN201110392191 CN 201110392191 CN 201110392191 A CN201110392191 A CN 201110392191A CN 102565102 B CN102565102 B CN 102565102B
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ct
liquid
image
energy
dual
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CN102565102A (en
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陈志强
张丽
王学武
胡海峰
吴宏新
李元景
刘以农
赵自然
邢宇翔
唐虎
易裕民
张金宇
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清华大学
同方威视技术股份有限公司
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Priority to CN200710180653.22007.10.05 priority
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Abstract

本发明公开了一种通过双能CT成像来对液态物品进行快速安全检查的方法及设备。 The present invention discloses a method and apparatus for fast checking safety by dual-energy CT imaging of the liquid articles. 首先借助CT扫描和双能重建方法,获得包含被检液体物理属性的一层或多层CT图像;然后通过图像处理和分析方法,从CT图像中获取每一件被检液体的物理属性值;最后将所获得的物理属性值和该液态物品的参考物理属性值进行比较,判断被检液态物品是否藏有毒品。 First, by means of dual-energy CT scan and reconstruction method, comprising one or more layers to obtain a CT image of the physical attributes of the subject liquid; then, obtaining the value of each one is the physical property of the liquid sample from the CT images by image processing and analysis; Finally, the physical properties of the obtained value and the reference value of the physical attributes of the liquid articles, and determines whether the possession of drugs are inspected liquid article. 其中,CT扫描方法既包括常规的断层CT扫描技术,也可用螺旋CT扫描技术实现;在使用常规断层CT扫描技术时,既可设置一系列特定的位置进行扫描,也可借助DR图像由操作员指定扫描位置,还可以通过对DR图像的自动分析来确定液体部分的位置,引导CT扫描。 Wherein, CT scanning method includes both conventional CT scanning tomography, CT examination can also be achieved; when using a conventional CT scanning tomography, can set a specific set of scan position, you can draw the image by the operator DR specified scanning position by the automatic analyzer may further DR image to determine the position of the liquid portion, the guide CT scan.

Description

液态物品检查方法和设备 Liquids inspection method and apparatus

[0001] 本申请是2007年10月5日提交给中国专利局的题为“液态物品检查方法和设备”的第200710180653.2号发明专利申请的分案申请。 [0001] This application is a divisional application to the Chinese Patent Office entitled "Method and apparatus for checking liquids" No. 200,710,180,653.2 invention patent applications in 2007, October 5th.

技术领域 FIELD

[0002] 本发明涉及辐射检查技术领域,特别涉及一种通过对液态物品进行双能CT成像来对液态物品进行快速安全检查的方法及设备。 [0002] The present invention relates to a radiation inspection technology, and particularly relates to a dual-energy CT imaging of the liquid articles for quick inspection of liquid articles security methods and apparatus.

背景技术 Background technique

[0003] 美国的9.11事件发生以后,航空领域的安全检查工作越来越受到重视。 [0003] After the United States of 9/11, aviation security inspection more and more attention. 在以往进行的行李包裹安全检查的基础上,增加了对旅客随身携带的液态物品的安全检查要求。 On the basis of past baggage security check parcels carried on an increase of security checks required of liquids passengers carry. 因此,急需有效的方式和手段进行行李物品中液态物品的快速安全检查。 Therefore, an urgent need effective ways and means quick security check of baggage in liquids.

[0004] 当前,有如下四类的方法可以用于液态物品的安全检查:化学方法、电磁方法、中子方法和射线方法,具体描述如下: [0004] Currently, there are four types of methods can be used as a security check of the liquid articles: chemistry, an electromagnetic method, and a method of neutron radiation methods, described as follows:

[0005] I)化学方法可以细分为气味识别、离子扫描探测和物质分析。 [0005] I) can be subdivided into a chemical odor identifying method, ion scan detection and analysis of materials. 气味识别在实际应用中常常因为液态物品被密封包装而无法实现检查。 Odor Recognition often because liquids are sealed package check can not be realized in practical application. 离子扫描探测以高敏感性著称,但是其缺点在于误报率高,常常受到背景环境的影响。 Ion scan detection with high sensitivity is known, but the disadvantage is that the false alarm rate, often influenced by the background environment. 物质分析具有精度高和准确性高的特点,但是这种方法需要一定的时间对样品进行分析,不能满足现场快速检查的需求。 Analysis of the material with high precision and high accuracy features, but this method takes time samples were analyzed, a quick check of the site can not meet the demand.

[0006] 2)电磁方法采取主动的测量方式,其根据不同液态物品对电磁波的介电常数不同从而将液态物品区分开来。 [0006] 2) an electromagnetic measuring method proactive manner, so that the liquid articles to distinguish different liquids in different zones on the basis of the dielectric constant of an electromagnetic wave. 电磁方法本身容易受到金属包装和较厚材料包装的不利影响。 Electromagnetic method itself vulnerable to the adverse effects of the thick metal packaging and packing materials. 因此,在包装材料复杂的实际情况下,电磁方法具有一定的局限性。 Thus, the packaging material complex at the actual situation, an electromagnetic method has some limitations.

[0007] 3)中子检查方法的使用会出现“中子活化”的现象,即经过中子检查的被检查液态物品会有辐射残留现象。 [0007] 3) neutron inspection method will be "neutron activation" phenomenon, i.e., after the neutron inspection will be inspected liquid article radiation sticking phenomenon. 并且,由于中子的穿透能力更强,故其辐射屏蔽更为复杂、设备占地面积大,因而不适合在民航的安全检查系统中使用。 Further, since the neutron penetration stronger, so the more complex radiation shielding, a large floor space, and is not suitable for use in aviation security inspection system.

[0008] 4)当前,航空领域的安全检查装置多为射线装置,这些装置中,目前采用最多的技术是X射线二维成像技术和三维CT扫描成像技术。 [0008] 4) Currently, aviation safety inspection apparatus is a multi-ray apparatus, these means, the most currently used techniques are two-dimensional X-ray imaging and three-dimensional CT scan imaging technology. 这些技术能获得物体的结构信息,但无法判断液体中是否藏有毒品;这是因为液体中藏有毒品后,只是成分发生变化,而总体结构并不会发生明显的变化。 These techniques can obtain structural information of the object, but can not determine whether possession of drugs in a liquid; this is because the liquid in possession of drugs, but the composition changes, but the overall structure will not change dramatically.

[0009] 综上所述,对于液态物品进行快速检查,化学方法、电磁方法和中子方法存在着本身不适合快速安全检查的特点,采用X射线二维成像技术和三维CT扫描成像技术,只能获得包含结构信息的图像,不能为判断液态物品是否藏有毒品提供充分依据。 [0009] In summary, a quick check for liquids, chemical methods, and electromagnetic methods there is not a suitable method for neutron fast security checks its own characteristics, the two-dimensional X-ray imaging and three-dimensional CT scan imaging technology, only can get the image contains structural information, do not provide a sufficient basis to determine whether liquids possession of drugs.

发明内容 SUMMARY

[0010] 为了克服上述现有技术中存在的不足,本发明的目的是提供了一种用射线对液态物品进行安全检查的方法和设备,它可以在不破坏液态物品包装的情况下对其进行快速检查,得到被检查液态物品的定量信息。 [0010] In order to overcome the above-described deficiencies of the prior art, an object of the present invention is to provide a method and apparatus for performing security checks for liquids with radiation, which can be in liquid articles without destroying the package quick check to be inspected liquid article to obtain quantitative information.

[0011] 在本发明的一个方面,提出了一种用双能CT对液态物品进行检查的方法,包括步骤:对被检液态物品进行双能CT扫描,得到双能CT投影数据;根据所述投影数据进行CT重建,得到表示被检液态物品的物理属性值的CT图像;根据所述CT图像提取被检液态物品的物理属性值;以及基于所述物理属性值和该液态物品的参考物理属性值来判断所述被检液态物品是否是可疑的。 [0011] In one aspect of the present invention there is provided a method of inspecting a dual-energy CT for liquids, comprising steps of: the liquid article dual-energy CT scanning, dual-energy CT projection data; according to the CT reconstruction projection data to obtain a CT image of the subject showing the physical property value of the liquid article; subject physical attributes of the liquid articles according to the CT image extraction; physical attributes and a reference value of the physical attribute of the liquid articles and based on value to determine whether the inspected liquid article is suspicious.

[0012] 根据本发明的实施例,所述物理属性值包括被检液态物品的密度和原子序数。 [0012] According to an embodiment of the present invention, including the physical attributes of the inspected liquid article density and atomic number.

[0013] 根据本发明的实施例,所述双能CT扫描采用平面断层CT扫描的方式。 [0013] According to an embodiment of the present invention, the dual-energy CT tomographic plane by way of a CT scan.

[0014] 根据本发明的实施例,所述双能CT扫描采用常规螺旋CT扫描的方式。 [0014] According to an embodiment of the present invention, the dual-energy CT by way of a conventional spiral CT.

[0015] 根据本发明的实施例,所述双能CT扫描采用大螺距螺旋CT扫描的方式。 [0015] According to an embodiment of the present invention, the dual-energy CT by way of a large pitch helical CT scan.

[0016] 根据本发明的实施例,在进行平面断层CT扫描之前,预先设定一组扫描位置。 [0016] According to an embodiment of the present invention, prior to the tomographic plane CT scan, a group of scanning a predetermined position.

[0017] 根据本发明的实施例,在进行平面断层CT扫描之前,先进行DR扫描得到被检物品的透射图像,然后根据透射图像确定CT扫描位置。 [0017] According to an embodiment of the present invention, prior to the tomographic plane CT scanning transmission image to be scanned subject items DR, and CT scan position is determined according to the transmission image.

[0018] 根据本发明的实施例,得到透射图像后,操作员通过输入装置指定透射图像中的至少一行,作为CT扫描位置。 [0018] According to an embodiment of the present invention, the obtained transmission image, the operator specifies at least one row of the transmission image through the input means, a CT scan position.

[0019] 根据本发明的实施例,得到透射图像后,通过图像处理技术自动确定透射图像中的至少一行,作为CT扫描位置。 [0019] According to an embodiment of the present invention, the obtained transmission image, automatically determining at least one row of the transmission image by image processing techniques, a CT scan position.

[0020] 根据本发明的实施例,形成透射图像的步骤包括:从射线源发出高能射线和低能射线,穿透被检物体,形成高能透射图像和低能透射图像;融合高能透射图像和低能透射图像,形成所述透射图像。 [0020] According to an embodiment of the present invention, the step of forming the transmission image comprising: a high-energy rays emitted from the radiation source and the low-energy rays penetrating the object to be inspected, energy transmission image and the low-energy transmission image; fused image and the low-energy high-energy transmission transmission image forming the transmission image.

[0021] 根据本发明的实施例,形成透射图像的步骤包括:从射线源发出高能射线和低能射线,穿透被检物体,形成高能透射图像和低能透射图像;选择高能透射图像和低能透射图像之一,作为所述透射图像。 [0021] According to an embodiment of the present invention, the step of forming the transmission image comprising: a high-energy rays emitted from the radiation source and the low-energy rays penetrating the object to be inspected, energy transmission image and the low-energy transmission image; selecting the high-energy and low-energy transmission image transmission image one, as the transmission image.

[0022] 根据本发明的实施例,从双能投影数据重建表示被检液态物品的物理属性值的CT图像的步骤包括:根据高低能投影数据,生成关于两种基材料系数的投影数据;根据所述两种基材料系数的投影数据进行重建,得到表示被检液体所对应的两种基材料系数的CT图像;以及根据所述表示基材料系数CT图像,生成所述表示被检液态物品物理属性值的CT图像。 [0022] According to an embodiment of the present invention, the dual-energy projection data is reconstructed showing steps are the subject of the physical attributes of the liquid articles CT images comprising: the low energy projection data, projection data is generated based on two kinds of material coefficients; according the two projection data reconstructing coefficients based material, the material to obtain a CT image group represents two coefficients corresponding to the subject liquid; represents a group and according to the CT image coefficient material, generating a representation of a physical liquid articles subject CT image property value.

[0023] 根据本发明的实施例,根据表示被检液态物品的物理属性值的CT图像,得到被检液态物品物理属性值的步骤包括:从所述CT图像中提取与液体部分相对应的像素;对液体部分的像素计算密度均值和原子序数均值,作为所述被检液态物品的密度和原子序数。 [0023] According to an embodiment of the present invention, the CT image representing the physical property value of the inspected liquid article, the step of obtaining physical attributes of the inspected liquid article comprising: extracting the liquid portion from the CT image corresponding to the pixels ; density calculated mean and the mean atomic number of a pixel portion of the liquid, the liquid article as the density and atomic number.

[0024] 根据本发明的实施例,基于所述物理属性值和该液态物品的参物理属性值来判断所述被检液态物品是否是可疑的步骤包括:计算所述密度和原子序数和所述参考密度和原子序数之间的差值;在所述差值大于预定的阈值的情况下,认为所述被检液态物品中隐藏了毒品。 [0024] According to an embodiment of the present invention, based on the reference value of the physical attributes and the physical attributes of the liquid articles to determine whether the inspected liquid article is questionable step comprises: calculating the density and the atomic number and a difference between the reference density and atomic number; in a case where the difference is greater than a predetermined threshold value, that is the subject of drugs concealed in liquid article.

[0025] 根据本发明的实施例,在针对每个位置进行双能CT扫描之后,旋转被检查液态物品的CT图像,使其与第一次双能CT扫描所形成的图像对齐。 [0025] According to an embodiment of the present invention, after the dual-energy CT for each position, rotation of the CT image to be inspected liquid article, so that the first image formed by dual-energy CT scans are aligned.

[0026] 根据本发明的实施例,在针对各行进行双能CT扫描之后,旋转被检液态物品,使其与扫描之前的位置相同。 [0026] According to an embodiment of the present invention, after the dual-energy CT scans for each row, rotating the inspected liquid article, so that the same position before scanning.

[0027] 根据本发明的实施例,所述液态物品放置在被分成了多个空间的桶内。 [0027] According to an embodiment of the present invention, the liquid articles placed in the barrel is divided into a plurality of spaces.

[0028] 根据本发明的实施例,所述的方法还包括步骤:利用预定的模板来自动检测桶的存在;在存在桶的情况下,检测CT图像中的特定标记;基于所述特定标记,将桶旋转到预定的位置。 [0028] According to an embodiment of the present invention, the method further comprises the step of: using a predetermined template to automatically detect the presence of the tub; in the presence of the tub, the specific detection of marker in the CT image; based on the particular label, the barrel is rotated to a predetermined position.

[0029] 根据本发明的实施例,所述的方法还包括步骤:将被检液态物品的判断结果显示在显示屏上。 [0029] According to an embodiment of the present invention, the method further comprising the steps of: liquid articles determination result shown on the display.

[0030] 根据本发明的实施例,所述的方法还包括步骤:将各个被检液态物品的判断结果打印出来。 [0030] According to an embodiment of the present invention, the method further comprises the step of: the result of the determination of the respective liquid articles printed.

[0031] 根据本发明的实施例,所述的方法还包括步骤:将各个被检液态物品的CT图像彩色化。 [0031] According to an embodiment of the present invention, the method further comprises the step of: CT images of each color of the inspected liquid article.

[0032] 在本发明的另一方面,提出了一种用双能CT对液态物品进行检查的设备,包括:射线源,用于发出射线;探测和采集装置,用于探测并采集穿透至少一件被检液态物品的射线信号;控制器,控制所述射线源和探测和采集装置对被检液态物品进行双能CT扫描,得到投影数据;从投影数据重建表示被检液态物品的至少一种物理属性值的CT图像的装置;以及基于所述物理属性值和该液态物品的参考物理属性值来判断所述被检液态物品是否是可疑的的装置。 [0032] In another aspect of the present invention there is provided an apparatus for inspection of liquid articles with a dual-energy CT, comprising: a radiation source for emitting radiation; detection and collection means for collecting and detecting penetrates at least a liquid articles radiation signal; and a controller to control the radiation source and the detection and collection means for the liquid article dual-energy CT scan to obtain projection data; denotes liquid articles at least one reconstructed from the projection data means seed CT image of the physical property value; and based on the physical property value and the reference value of the physical property of the liquid article to determine whether the inspected liquid article is suspicious device.

[0033] 根据本发明的实施例,所述双能CT扫描是基于预定的位置进行的。 [0033] According to an embodiment of the present invention, the dual-energy CT is performed based on a predetermined position.

[0034] 根据本发明的实施例,所述探测和采集装置探测并采集穿透至少一件被检液态物品的射线信号以形成透射图像;其中所述设备还包括指定透射图像中的至少一行的装置;所述双能CT扫描是基于所指定的行而进行的。 [0034] According to an embodiment of the present invention, the detection and collection means and the detection signal acquired rays penetrating the at least one liquid articles to form a transmission image; wherein said apparatus further comprises at least one row of the transmission image designated means; a dual-energy CT scanning is performed on the specified row carried out.

[0035] 根据本发明的实施例,所述物理属性值至少包括被检液态物品的密度和原子序数。 [0035] According to an embodiment of the present invention, the physical property value of the inspected liquid article comprising at least the density and atomic number.

[0036] 根据本发明的实施例,从射线源发出高能射线和低能射线,穿透被检物体,形成高能透射图像和低能透射图像,所述设备还包括:融合高能透射图像和低能透射图像形成所述透射图像的装置。 [0036] According to an embodiment of the present invention, high-energy rays emitted from the radiation source and the low-energy rays penetrating the object to be inspected, and the energy transmission low-energy image transmission image, said apparatus further comprising: a high energy transmission image and the fused image forming low-energy transmission the image transmission apparatus.

[0037] 根据本发明的实施例,从射线源发出高能射线和低能射线,穿透被检物体,形成高能透射图像和低能透射图像,所述设备还包括:选择高能透射图像和低能透射图像之一,作为所述透射图像的装置。 [0037] According to an embodiment of the present invention, high-energy rays emitted from the radiation source and the low-energy rays penetrating the object to be inspected, and the energy transmission low-energy image transmission image, said apparatus further comprising: selecting a low energy and a high energy transmission image of the transmission image First, as said transmitted image.

[0038] 根据本发明的实施例,所述指定透射图像中的至少一行的装置包括:操作员利用输入装置从透射图像中选择至少一行的装置。 Selecting means of at least one row of the transmission image from the operator input device: [0038] According to an embodiment of the present invention, means at least one row of the transmission image comprises specified.

[0039] 根据本发明的实施例,所述指定透射图像中的至少一行的装置包括:分析所述透射图像的像素值,以将所述透射图像分层的装置;将各层中的中间行指定为要进行双能CT扫描的行的装置。 [0039] According to an embodiment of the present invention, means at least one row of the transmission image comprises specifying: analyzing the pixel value of the transmission image, to the image transmission apparatus of the layered; intermediate layers rows to be designated as a device row of dual-energy CT scan.

[0040] 根据本发明的实施例,从投影数据重建表示被检液态物品的物理属性值的CT图像的装置包括:融合由被检液态物品的密度所标识的密度图像和由被检液态物品的原子序数所标识的原子序数图像作为所述CT图像的装置;从所述CT图像中提取与液体部分相对应的像素;对液体部分的像素计算密度均值和原子序数均值作为所述被检液态物品的密度和原子序数的装置。 [0040] According to an embodiment of the present invention, from the projection data is reconstructed showing apparatus CT image of physical property value of the inspected liquid article comprising: a fused density image by the density of the inspected liquid article is identified and the inspected liquid article atomic atomic number image identified as said CT image; extracting pixels corresponding to the liquid portion from the CT image; calculating average density and average atomic number as a pixel of the liquid portion of the liquid article the density and atomic number of the apparatus.

[0041] 根据本发明的实施例,基于所述物理属性值和该液态物品的参考物理属性值来判断所述被检液态物品是否是可疑的装置包括:计算所述密度和原子序数和所述参考密度和原子序数之间的差值的装置;在所述差值大于预定的阈值的情况下,认为所述被检液态物品中隐藏了毒品。 [0041] According to an embodiment of the present invention, the physical property value based on the reference value of the physical attribute of the liquid articles and to determine whether the inspected liquid article is questionable apparatus comprising: calculating the density and the atomic number and It means the difference between the reference density and atomic number; in a case where the difference is greater than a predetermined threshold value, that is the subject of drugs concealed in liquid article.

[0042] 根据本发明的实施例,所述的设备还包括在针对每行进行双能CT扫描之后,旋转被检查液态物品的CT图像,使其与第一次双能CT扫描所形成的图像对齐的装置。 [0042] According to an embodiment of the present invention, the apparatus further comprising, after the dual-energy CT scans for each row, rotating the inspection of liquid articles CT image, the first image and the dual-energy CT scans so formed alignment means.

[0043] 根据本发明的实施例,所述的设备还包括在针对各行进行双能CT扫面之后,旋转被检液态物品,使其与扫描之前的位置相同的装置。 [0043] According to an embodiment of the present invention, the apparatus further comprising, after the dual-energy CT scan plane for each line, the inspected liquid article rotation, so that the same position before the scanning means.

[0044] 根据本发明的实施例,所述的设备还包括桶,被分成了多个空间,分别用于放置所述液态物品。 [0044] According to an embodiment of the present invention, the apparatus further includes a tub, is divided into a plurality of spaces, respectively, for placing the liquid articles.

[0045] 根据本发明的实施例,所述的设备还包括:利用预定的模板来自动检测桶的存在的装置;在存在桶的情况下,检测CT图像中的特定标记的装置;基于所述特定标记,将桶旋转到预定的位置的装置。 [0045] According to an embodiment of the present invention, the apparatus further comprising: means using a predetermined template exists to automatically detect the tub; in the presence of the tub, a CT image means for detecting the specific marker; based on the specific tag, the tub is rotated to a predetermined position of the apparatus.

[0046] 根据本发明的实施例,所述的设备还包括:显示装置,显示被检液态物品的判断结 [0046] According to an embodiment of the present invention, the apparatus further comprising: display means for displaying the judgment result of the inspected liquid article

果O If O

[0047] 根据本发明的实施例,所述的设备还包括:将各个被检液态物品的判断结果打印出来的装置。 [0047] According to an embodiment of the present invention, the apparatus further comprising: a determination result of various liquid articles print apparatus.

[0048] 根据本发明的实施例,所述的设备还包括:将各个被检液态物品的CT图像彩色化的装置。 [0048] According to an embodiment of the present invention, the apparatus further comprising: a CT image of the respective color liquid articles of the apparatus.

[0049] 根据本发明的实施例,所述的设备还包括承载所述被检液态物品的承载机构,所述承载结构承载所述被检液态物品的表面上被划分成操作人员可识别的多个区域。 [0049] According to an embodiment of the present invention, the apparatus further comprises a support means carrying the liquid articles being the subject of the carrier structure carrying the upper surface of the liquid article to be inspected is divided into a plurality of recognizable operator areas.

[0050] 根据本发明的实施例,所述的设备还包括承载所述被检液态物品的承载机构,所述承载机构承载所述桶的表面上有多个定位孔,使得所述桶底部的凸起能够插入到承载机构上对应的定位孔中。 [0050] According to an embodiment of the present invention, the apparatus further comprises a support means carrying the liquid articles to be inspected, and a plurality of positioning holes on the surface of the tub mechanism carrying the carrier, such that the bottom of the tub the projection can be inserted into the positioning holes of the support means.

[0051] 在本发明的又一方面,提出了一种用双能CT对液态物品进行检查的设备,包括:射线源,用于发出射线;探测和采集装置,用于探测并采集穿透至少一件被检物体的射线信号;控制器,控制所述射线源和探测和采集装置对被检液态物品进行螺旋CT扫描,来形成每个均表示被检液态物品的至少一种物理属性值的一组螺旋CT图像;分析该组螺旋CT图像以确定液体的螺旋CT图像部分的装置;以及基于所述物理属性值和该液态物品的参考物理属性值来判断所述被检液态物品是否是可疑的装置。 [0051] In a further aspect of the present invention there is provided an apparatus for inspection of liquid articles with a dual-energy CT, comprising: a radiation source for emitting radiation; detection and collection means for collecting and detecting penetrates at least an object to be inspected ray signal; and a controller to control the radiation source and the detection and collection means for the liquid article spiral CT scan to form each represents at least one physical attribute of the liquid articles value a set of helical CT images; analyzing the image to determine a set of helical CT apparatus spiral CT image portion of the liquid; and the physical property value based on the reference value of the physical attribute of the liquid articles and to determine whether the inspected liquid article is suspicious s installation.

[0052] 根据本发明的实施例,所述物理属性值至少包括被检液态物品的密度和原子序数。 [0052] According to an embodiment of the present invention, the physical property value of the inspected liquid article comprising at least the density and atomic number.

[0053] 利用本发明的方法和设备,由于采用透射图像作为引导来进行双能CT扫描,在提高了检测速度的同时,并不降低检测准确率,并且通过透射图像还可以判断液态物品是否 [0053] using the method and apparatus of the present invention, since a transmission image guided by dual-energy CT scan, to improve the detection speed, while not reducing the detection accuracy, and the transmission image through the liquid article can also determine whether

存在夹层。 There is a sandwich.

[0054] 另外,通过将测量的密度与原子序数与参考密度和原子序数相比,可以判断被检液态物品(比如酒等)是否藏有毒品(比如可卡因等)。 [0054] Further, by measuring the density and atomic number compared with the reference density and atomic number, based on the inspected liquid article (such as wine) whether the possession of drugs (such as cocaine).

[0055] 另外,操作员可以在任何指定的位置进行双能CT扫描,方便了复查操作的进行。 [0055] Further, the operator may be dual-energy CT scan, to facilitate the operation for review at any given location. 另外,操作员可以根据具体的需要自行添加新的被检液体种类。 Further, the operator can add a new subject liquid type according to their own specific needs.

[0056] 另外,在多件同时检测的情况下,采用分格桶,可以方便地确定是那件被检液态物品是可疑的。 [0056] Further, in the case of simultaneous detection of multiple pieces, using a divided barrel can be easily determined that elements are inspected liquid article is suspicious. 附图说明 BRIEF DESCRIPTION

[0057] 从下面结合附图的详细描述中,本发明的上述特征和优点将更明显,其中: [0057] from the following detailed description of the drawings The above features and advantages of the invention will become more apparent, wherein:

[0058] 图1是根据本发明实施方式的检查设备的结构示意图; [0058] FIG. 1 is a diagram showing the configuration of inspection apparatus according to an embodiment of the present invention;

[0059] 图2示出了如图1所示的计算机数据处理器60的结构框图; [0059] FIG. 2 shows a block diagram of the computer data processor 60 is shown in Figure 1;

[0060] 图3示出了根据本发明第一实施方式的控制器的结构框图; [0060] FIG. 3 shows a block diagram of a controller according to a first embodiment of the present invention;

[0061] 图4示出了在数据库中存储各种液态物品的标识信息和属性信息所采用的结构; [0061] FIG. 4 shows a structure for storing various liquid articles in the database identification information and attribute information used;

[0062] 图5是用于说明DR成像和CT成像的关系的不意图; [0062] FIG. 5 is not intended relationship between DR imaging and CT imaging for explaining;

[0063] 图6示出了DR成像结果的一个例子; [0063] FIG. 6 illustrates an example of a DR imaging results;

[0064] 图7示出了DR成像结果的另一例子; [0064] FIG. 7 shows another example of a DR imaging results;

[0065] 图8示出了根据本发明第一实施方式的液态物品检查方法的总体流程图; [0065] FIG. 8 shows a general flowchart for a method according to a first embodiment of the liquid article embodiment of the present invention;

[0066] 图9不出了DR成像过程的流程图; [0066] The flowchart of FIG. 9 not a DR imaging process;

[0067] 图10示出了在DR成像过程中探测和采集装置30所采集的DR图像数据的排列方式; [0067] FIG. 10 shows the arrangement of a DR imaging probe during the acquisition and the DR apparatus 30 acquired image data;

[0068] 图11示出了对DR图像进行处理以确定CT扫描位置的流程图; [0068] FIG. 11 shows a flowchart of the DR image is processed to determine the position of the CT scan;

[0069] 图12示出了CT成像过程; [0069] FIG. 12 illustrates a CT imaging procedure;

[0070] 图13示出了在CT成像过程中CT投影数据的排列方式; [0070] FIG. 13 shows the arrangement of the CT projection data of the CT imaging process;

[0071] 图14示出了测量液体属性的过程; [0071] FIG. 14 shows a process of measuring properties of the liquid;

[0072] 图15示出了对数据库进行扩展的过程; [0072] FIG. 15 shows a process of expanding the database;

[0073] 图16A和图16B示出了根据本发明第二实施方式的检测多件液态物品的情况下重建的CT图像的示意图; [0073] FIGS. 16A and 16B shows a schematic view of the CT image reconstruction based on the detected second embodiment of the present invention is a multi-piece embodiment of the liquid articles;

[0074] 图17A到17K示出了在CT成像完成之后,如何对CT重建图像和/或承载机构进行旋转使其与CT扫描之前物体的相对位置相一致的过程; [0074] FIGS. 17A to 17K illustrate after the CT imaging is completed, how it is rotated relative position of the object coincides with the CT scan before the process of CT image reconstruction, and / or carrying means;

[0075]图18示出了在多件被检物体的情况下进行检查的流程图; [0075] FIG. 18 shows a flowchart of the inspection object to be detected in the case of a multi-piece;

[0076] 图19示出了根据本发明第二实施方式的承载机构的俯视图; [0076] FIG. 19 shows a top view of a carrier means according to the second embodiment of the present invention;

[0077] 图20示出了根据本实施方式的分格桶的侧视图; [0077] FIG. 20 shows a side view of a divided barrel according to the present embodiment;

[0078] 图21示出了分格桶的俯视图; [0078] FIG. 21 shows a top view of a divided barrel;

[0079] 图22示出了分格桶的底视图; [0079] FIG. 22 shows a bottom view of a divided barrel;

[0080] 图23示出了在检查过程中如何自动检测分格桶和标记的过程; [0080] FIG. 23 shows a process how to automatically detect a divided barrel and a mark in the inspection process;

[0081] 图24A到24D示出了在检测过程中旋转桶的示意图; [0081] FIGS. 24A to 24D shows a schematic view of the rotating tub in the testing process;

[0082] 图25示出了根据第三实施方式的检查过程的流程图; [0082] FIG. 25 shows a flowchart of an inspection process of the third embodiment;

[0083] 图26A是说明液体在隐藏了毒品之后密度的变化曲线; [0083] FIG. 26A is a density curve of liquid drugs concealed in the following;

[0084] 图26B是说明液体在隐藏了毒品之后原子序数的变化曲线; [0084] FIG. 26B is a curve drugs concealed in the liquid after atomic number;

[0085] 图26C是说明液体在隐藏了毒品之后特征密度的变化曲线; [0085] FIG 26C is a diagram illustrating a liquid drugs concealed after feature density change curve;

[0086] 图27详细说明第四发明实施方式的检查方法的流程图; A method flowchart for a fourth embodiment of the invention, [0086] FIG. 27 described in detail;

[0087] 图28是说明对液态物品进行螺旋CT扫描的示意图; [0087] FIG. 28 is a schematic diagram of the liquid article described spiral CT scan;

[0088] 图29A到29M是说明对液态物品进行螺旋CT扫描所得到的图像。 [0088] FIGS. 29A to 29M are explanatory helical CT image of the obtained liquid articles.

具体实施方式 Detailed ways

[0089] 下面,参考附图详细说明本发明的优选实施方式。 [0089] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. 在附图中,虽然示于不同的附图中,但相同的附图标记用于表示相同的或相似的组件。 In the drawings, although shown in different drawings, the same reference numerals are used to designate the same or similar components. 为了清楚和简明,包含在这里的已知的功能和结构的详细描述将被省略,否则它们将使本发明的主题不清楚。 For clarity and conciseness, a detailed description of known functions and configurations incorporated herein will be omitted, otherwise they will subject of the present invention unclear.

[0090]【第一实施方式】 [0090] [First Embodiment

[0091] 图1是根据本发明实施方式的检查设备的结构示意图。 [0091] FIG. 1 is a schematic view of an inspection apparatus according to the embodiment of the present invention. [0092] 如图1所示,根据本实施方式的检查设备包括:发出检查用双能X射线的射线源10,诸如X光机;承载机构40,其承载被检液态物品围绕轴Z转动,并且可以升降,使得被检液态物品进入检测区域,从而由射线源10发出的射线能够透过被检液态物品;探测和采集装置30,它是具有整体模块结构的探测器及数据采集器,用于探测透射被检液态物品的双能射线,获得模拟信号,并且将模拟信号转换成数字信号,从而输出液态物品针对高能X射线和低能X射线的扫描数据;控制器50,它用于控制整个系统的各个部分同步工作;以及计算机数据处理器60,它用来处理由数据采集器采集的数据,并输出检查结果。 [0092] 1, an inspection apparatus according to the embodiment comprises: issuing inspection dual energy X-ray radiation source 10, such as an X-ray machine; bearing means 40, which carrier is rotatable about the axis Z inspected liquid article, and may lift, so that the inspected liquid article enters the detection area, so that rays emitted by the radiation source 10 can be transmitted through the liquid article; detection and collection means 30, which is integral with the module structure of the probe and data acquisition, with for detecting transmission liquid articles dual-energy rays to obtain an analog signal, and converts the analog signal into a digital signal, to output the scan data for the liquid articles energetic X-rays and low energy X-rays; a controller 50 for controlling the entire parts of the system operate synchronously; and a computer data processor 60, which is used to process the data acquired by the data acquisition unit, and outputs the inspection result.

[0093] 如图1所示,射线源10置于可放置被检液态物品的承载机构40 —侧,探测和采集装置30置于承载机构40的另一侧,包括探测器和数据采集器,用于获取被检液态物品DR数据和多角度投影数据。 [0093] As shown, radiation source 10 in FIG. 1 can be placed on the carrier mechanism 40 to be inspected liquid article - side, detection and collection means 30 placed on the other side of the carrier mechanism 40, comprising a detector and a data collector, inspected liquid article for acquiring data DR and the multi-angle projection data. 数据采集器中包括数据放大成形电路,它可工作于(电流)积分方式或脉冲(计数)方式。 The data collector includes a data shaping amplifying circuit which can operate in (current) integration mode or pulses (counting) mode. 探测和采集装置30的数据输出电缆与计算机数据处理器60连接,根据触发命令将采集的数据存储在计算机数据处理器60中。 The detection and collection means connected to a data output cable 30 to the computer data processor 60, according to the triggering command of the collected data stored in a computer data processor 60.

[0094] 另外,检查设备还包括由金属制成的筒状物体通道20,它设置在承载机构40上,能屏蔽X射线向外的辐射。 [0094] Further, the inspection apparatus further comprises a cylindrical body made of metal passage 20, which is provided on the carrier mechanism 40, the X-ray radiation can be shielded outwardly. 被检液态物品放置在被检物体通道中。 Inspected liquid article is placed in the object to be inspected channels.

[0095] 图2示出了如图1所示的计算机数据处理器60的结构框图。 [0095] FIG. 2 shows a block diagram of the computer data processor 60 shown in FIG. 如图2所示,数据采集器所采集的数据通过接口单元68和总线64存储在存储器61中。 As shown in FIG 2, the data collected by data acquisition memory 61 through the interface unit 68 and the bus 64 are stored in. 只读存储器(ROM) 62中存储有计算机数据处理器的配置信息以及程序。 A read only memory (ROM) 62 stores computer data processor and program configuration information. 随机存取存储器(RAM)63用于在处理器66工作过程中暂存各种数据。 A random access memory (RAM) 63 for temporarily storing various data during operation of the processor 66. 另外,存储器61中还存储有用于进行数据处理的计算机程序和预先编制的数据库,该数据库存储有各种已知液态物品的相关信息,例如液体名称、种类和物理属性等信息,用于与处理器66所计算出的被检液态物品中液体的诸如密度和原子序数之类的属性值进行比较。 Further, memory 61 also stores a computer program for performing data processing and the pre-programmed database, the database stores various relevant information known liquid articles, such as liquid name information, the type and physical properties of the like, for processing 66 calculated is compared to the value of the inspected liquid article attributes such as liquid density and atomic number or the like. 内部总线64连接上述的存储器61、只读存储器62、随机存取存储器63、输入装置65、处理器66、显示装置67和接口单元68。 An internal bus 64 connects the memory 61, read only memory 62, random access memory 63, an input device 65, processor 66, a display device 67 and an interface unit 68.

[0096] 在用户通过诸如键盘和鼠标之类的输入装置65输入的操作命令后,计算机程序的指令代码命令处理器66执行预定的数据处理算法,在得到数据处理结果之后,将其显示在诸如LCD显示器之类的显示装置67上,或者直接以诸如打印之类硬拷贝的形式输出处理结果。 [0096] After the operation command input by a user input device such as a keyboard and a mouse 65, the computer program instruction code to the command processor 66 performs predetermined data processing algorithm, after obtaining the data processing result be displayed, such as the display device or the like on the LCD display 67, or directly outputs the processing result or the like, such as printing a hard copy form.

[0097] 图3示出了根据本发明实施方式的控制器的结构框图。 [0097] FIG. 3 shows a block diagram of a controller according to an embodiment of the present invention. 如图3所示,控制器50包括:控制单元51,根据来自计算机60的指令,来控制射线源10、承载机构40和探测和采集装置30 ;触发信号产生单元52,用于在控制单元的控制下产生用来触发射线源10、探测和采集装置30以及承载机构40的动作的触发命令;第一驱动电机55,它在根据触发信号产生单元52在控制单元51的控制下产生的触发命令驱动承载机构40上升或者下降;高度信息获取单元53,它随着承载机构40的运动,向控制单元51反馈承载机构的高度信息;第二驱动电机56,它在根据触发信号产生单元52在控制单元51的控制下产生的触发命令来驱动承载机构40旋转;角度信息获取单元54,它在承载机构40旋转过程中获取承载机构40的旋转角度,反馈给控制单元51。 3, the controller 50 includes: a control unit 51, according to an instruction from the computer 60 to control the radiation source 10, and the detection mechanism 40 and the carrier collection device 30; trigger signal generating unit 52, a control unit 10 is generated under the control operation of the detection and collection means 30 and support means 40 trigger command to the trigger radiation source; a first driving motor 55, which produces under the control of the control unit 51 according to the trigger signal trigger command generating unit 52 the drive mechanism 40 up or down the carrier; height information obtaining unit 53, which with the movement of the carrier mechanism 40, the height of the feedback information carrier means to the control unit 51; a second drive motor 56, which in accordance with the trigger signal generating unit 52 in the control triggering commands generated at the control unit 51 drives the rotation of the carrier means 40; angle information obtaining unit 54, which acquires a rotation angle of the carrier mechanism 40 carrying means 40 is rotated in the process, back to the control unit 51. [0098] 根据本发明的实施方式,上述的高度信息获取单元53和角度信息获取单元54都是光电码盘,它具备抗干扰的优点。 [0098] According to an embodiment of the present invention, the altitude information acquisition unit 53 and angle information acquiring unit 54 is a photoelectric encoder, it has the advantages of immunity.

[0099] 如上所述,在存储器61中存储有数据库,其中以树状结构存储了已知的各种液态物品的标识信息和物理属性值,例如液态物品的参考密度和参考原子序数。 [0099] As described above, the database stored in the memory 61, wherein the tree structure is stored identification information and the known values ​​of various physical properties of the liquid articles, such as reference density and reference atomic liquid article. 图4示出了在数据库中存储各种液态物品的标识信息和属性信息所采用的结构。 FIG. 4 shows a structure for storing various liquid articles in the database identification information and attribute information employed.

[0100] 例如所有样本首先被分为若干子类,比如子类I (酒)、子类2 (可乐)、子类3 (牛奶),……子类η等。 [0100] For example, all samples are first divided into several subclasses, such as subclass I (wine), subclass 2 (coke), subclass 3 (milk), and the like ...... η subclass. 然后,每个子类被细分为若干子类。 Then, each class is subdivided into several sub-subclass. 例如子类1(酒)被细分为子类 E.g. subclass 1 (wine) is subdivided into subclasses

1.1 (葡萄酒)、子类1.2 (蒸馏酒)、子类1.3 (啤酒),……,子类1.η等等。 1.1 (wine), subclass 1.2 (distilled liquor), subclass 1.3 (beer), ......, etc. 1.η subclass. 每个子类继续细分。 Each subclass continue subdivision. 比如,子类1.2 (蒸馏酒)细分为子类1.2.1 (朗姆酒)、子类1.2.2 (威士忌)、子类1.2.3(伏特加)、……、子类1.2.η (中国白酒),直到子类内部各样本的参考密度和原子序数的差异小于某一指定的值,比如系统测量噪声的范围,则不再细分,该小类成为属性结构的叶子节点。 For example, subclass 1.2 (distilled liquor) is subdivided into subclasses 1.2.1 (rum), subclass 1.2.2 (whiskey), subclass 1.2.3 (vodka), ......, subclass 1.2.η ( Chinese liquor), until the difference between the reference density and atomic number of each sample is less than a specified internal subclass values, such as system noise in the measurement range, is not broken, the subclass attribute becomes the leaf node structure.

[0101] 另外,每个叶子节点用其所有父节点名称的组合来标识,比如“古巴产40度哈瓦那朗姆酒”。 [0101] In addition, each leaf node with a combination of all of its parent node to identify names, such as "40 degrees Havana, Cuba rum production." 该标识与参考密度和参考原子序数是一一对应的。 The identification with the reference density and reference atomic number is one to one. 在检查流程中,计算机将树状结构逐级展示给用户,操作员通过逐级选择的方式输入标识信息。 In the inspection process, the computer will display the tree structure to a user step by step, the operator inputs identification information by stepwise selection. 比如,操作员希望获得一瓶古巴产40度哈瓦那朗姆酒的物理属性信息,可以沿酒- >蒸馏酒- >朗姆酒- >古巴朗姆酒- > 哈瓦那朗姆酒-> 40度的路径逐级选择。 For example, the operator wishes to obtain a bottle of capacity 40 degrees Cuba Havana physical attribute information of rum, wine can be moved - rum> - -> Cuban rum -> distilled spirits> Rum Havana -> 40 degrees select path step by step.

[0102] 操作员通过逐级选择输入标识的过程,同时也是计算机检索的过程,当用户确定最终标识时,其所对应的参考密度和原子序数也被同时检索出来。 [0102] identified by the operator during stepwise selection input, but also the computer search process, when the user determines a final identification, it corresponds to the reference density and atomic number are also retrieved simultaneously.

[0103] 图5是用于说明DR成像和CT成像的关系的示意图。 [0103] FIG. 5 is a diagram showing the relationship of DR imaging and CT imaging for explaining. 根据本发明的第一实施方式,首先对液态物品进行DR成像,以便判断液态物品中的液体部分,然后仅仅针对液体部分中的某个位置进行CT成像,以便提高检查的速度。 According to a first embodiment of the present invention, the first liquid article on the DR image, in order to determine the liquid portion of the liquid article, and then only for the CT imaging position of a liquid portion, in order to improve the speed of examination.

[0104] 图6和图7分别示出了DR成像的例子。 [0104] Figures 6 and 7 show an example of DR imaging. 如图6所示,在对某液态物品进行DR成像之后,通过如下所述的对像素值进行分析来判断液态物品中液体的位置。 6, after the DR imaging a liquid articles to determine the position of the liquid article on the pixel values ​​of the liquid analyzed by the following. 如图6所示,该液态物品中仅仅包含一种液体。 6, the liquid article contains only one liquid. 但是,如图7所示,由于不同液体对液体的吸收系数不同,当液态物品包含两种或者两种以上的液体,并且液体中出现分层时,通过对DR成像后获得的DR图像进行像素分析来判断液体之间的分界面的位置。 However, as shown, different liquids due to the different absorption coefficient of liquid article when the liquid comprises two or more liquid or both, and the liquid delamination occurred, pixel by DR DR images obtained by imaging after 7 analysis to determine the location of the interface between the liquids. 然后,针对不同的液体进行CT成像。 Then, the CT imaging for different liquids.

[0105] 图8示出了根据本发明第一实施方式的液态物品检查方法的总体流程图。 [0105] FIG. 8 shows a general flowchart for a method according to a first embodiment of the liquid article embodiment of the present invention. 如图8所示,例如在通关期间,需要对乘客携带的液态物品进行安全检查。 As shown in FIG 8, for example during customs clearance, liquid articles need to carry a passenger security check. 首先在步骤S110,操作员将被检液态物品放在承载机构40上,并且根据乘客的报关单或者液态物品上的标签获取该液态物品的标识信息,例如40度郎姆酒。 First, at step S110, the operator on the inspected liquid article support means 40, and acquires identification information of the liquid articles according to the declaration on the label or liquids passengers, such as 40 degrees rum.

[0106] 然后,在步骤S111,操作员根据该标识信息从数据库中搜索获取其参考密度和参考原子序数。 [0106] Then, at step S111, the operator searches the reference density which is acquired from the database according to the identification information and the reference atomic number. 接下来,操作员按下启动按钮开始执行DR扫描,以生成DR图像,如图6和7所示。 Next, the operator presses the start button begin DR scan to generate an image DR, 6 and 7.

[0107] 如上所述,进行DR扫描的目的在于:一是获取被检液态物品的透视图像,使操作员能够看清被检液体的内部结构;二是软件能够根据DR图像自动识别液体位置,引导下一步的CT成像;三是用户可以在DR图像指定需要进行CT成像和检查的位置,引导下一步的CT成像。 Objective [0107] As described above, the DR scan: First, obtaining a perspective image of the inspected liquid article, enabling an operator to see the internal configuration of the subject liquid; the second is software that can automatically identify the DR image according to the position of the liquid, next CT imaging guidance; third position the user may need to specify the DR image examination and CT imaging, CT imaging to guide the next step. 后面将详细描述DR成像的详细过程。 DR imaging detailed process will be described later in detail. [0108] 必须说明的是,DR扫描并不是必须的。 [0108] must be noted that, DR scanning is not necessary. 为了加快检查速度,可以不通过DR扫描来引导CT扫描,而是直接预定若干位置进行CT扫描。 In order to speed up the checking, the guide may not be scanned by the DR CT scanning, a predetermined number of locations but directly CT scan. 比如,经过调研,可知在距离瓶底5厘米的进行CT扫描时,可检查到大部分液体商品的液体部位,则可使用离瓶底5厘米的高度作为预定扫描高度。 For example, through research, we found that when scanning is performed from the bottom 5 cm CT, may check the majority of the liquid portion of the liquid product may be used from a height of 5 cm in bottom scan as a predetermined height. 另外,操作员可以通过目测被检物尺寸,凭经验设置合适的高度,比如设置罐状可乐的扫描高度为3cm,而设置瓶底较厚的葡萄酒的扫描高度为10cm。 Further, the operator may be the size of the detected object, set empirically visually suitable height, such as setting the height of the scanning cup-shaped Coke is 3cm, the bottom thicker provided for scanning the height of the wine 10cm.

[0109] 在获得DR图像后,在步骤S113A,对DR图像进行分析,自动确定CT成像的扫描位置(如图6和图7中箭头所指的位置),或者在步骤S113B,由操作员操作诸如鼠标之类的输入装置65来指定要进行CT扫描的位置。 [0109] After obtaining the DR image, at step S113A, the DR image is analyzed to automatically determine the position of CT imaging scan (position of FIG. 6 and indicated by the arrow in FIG. 7), or at step S113B, operated by an operator an input device such as a mouse 65 to specify the position of the CT scan. 这样,由于仅仅对液态物品中有代表性的位置进行CT扫描,从而加快了检查速度,而不会降低检查质量。 Thus, since only the position of the liquid articles typical CT scan, thereby speeding up the inspection speed without degrading the quality inspection.

[0110] 在确定了CT扫描的位置之后,在步骤S114执行CT扫描过程,也就是针对上述确定的扫描位置对液态物品进行CT扫描,获得CT扫描数据,并且根据重建算重建CT图像。 [0110] After determining the location of the CT scans, CT scans performed in the process step S114, that is, determining the position of the scanning for a CT scan of the liquid articles to obtain CT scan data, and the reconstructed CT image reconstruction calculation. 该CT图像的每个像素代表了液态物品中相应部分的密度和原子序数。 Each pixel of the CT image density and atomic number represent corresponding parts in the liquid articles.

[0111] 然后,在步骤S115,计算机通过执行分析程序来分析CT图像,获取测量的密度和原子序数。 [0111] Then, at step S115, the analysis performed by the computer program to analyze a CT image, the measured density and atomic number acquired. 进而,在步骤S116,对测量的密度和原子序数和从数据库中检索的参考密度和原子序数进行比较,判断二者是否彼此一致,例如二者之差是否小于预定的阈值。 Further, at step S116, the density and atomic number of the measurement and reference density and atomic number retrieved from the database, and determines whether the two coincide with each other, for example, the difference between them is smaller than a predetermined threshold value. 在步骤S117,如果差值大于预定的阈值,则表明该液态物品是可疑的,向操作员发出报警,或者打印出检查结果。 In step S117, if the difference is greater than a predetermined threshold value, it indicates that the liquid article is suspicious, alert the operator, or to print out test results.

[0112] 下面结合附图9〜14详细说明上述各个步骤的详细操作过程。 [0112] The following detailed description of detailed operation of the above steps in conjunction with the accompanying drawings 9~14. 图9示出了DR成像过程的流程图,而图10示出了在DR成像过程中探测和采集装置30所采集的DR图像数据的排列方式。 Figure 9 shows a flowchart of a DR imaging process, and FIG. 10 shows the arrangement of the detection process in a DR imaging device 30 and acquisition of image data acquired DR.

[0113] 如图9所示,在DR成像过程中,在步骤S210,从计算机60向控制器50发送命令,以驱动承载机构40沿物体通道20垂直运动。 [0113] As shown in FIG. 9, the DR imaging process, at step S210, the controller 50 sends a command to the computer 60, the carrier mechanism 40 to drive the object along a vertical movement passage 20. 控制器50在承载机构垂直运动的过程中,通过高度信息获取单元53实时监控承载机构的高度。 Controller 50 during vertical movement of the support means, the height obtaining unit 53 real-time monitoring means carried by the height information.

[0114] 在步骤S211,控制器50每隔一定的高度(比如I毫米)给探测和采集装置30发送一个触发信号。 [0114] In step S211, the controller 50 every predetermined height (for example, I mm) for the detection and collection means 30 transmits a trigger signal. 探测和采集装置30接收到该触发信号后,对每个探测器的输出信号进行一次采集,获得高能探测数据和低能探测数据,并保存到其内置的缓冲器中。 After the detection and collection means 30 receives the trigger signal, the output signal of each detector to make an acquisition to obtain low-energy and high-energy detection data detection data, and to save its built-in buffer.

[0115] 在步骤S212,判断承载机构40是否达到指定高度,比如500毫米。 [0115] In step S212, the bearing means 40 determines whether the specified height, for example 500 mm. 如果仍未达到,则流程转到步骤S210,继续上述操作。 If not reached, the flow proceeds to step S210, continues the above operation.

[0116] 如果承载机构40到达上述预定的高度,则控制器50不再给探测和采集装置30发送触发信号。 [0116] If the carrier mechanism 40 reaches the predetermined height, the longer the controller 50 to the detection and collection means 30 transmits a trigger signal. 计算机60从探测和采集装置30中读取采集到的高低能探测器信号,排列为数据矩阵的形式,成为DR图像。 The computer 60 reads from the detection and collection device 30 can be collected by the detector signal level, are arranged in the form of a data matrix, it becomes the DR image. DR图像的每个像素,记录了射线穿透物体后剩余的强度,包括低能射线强度和高能射线强度。 DR for each pixel of the image, the residual strength after recording the rays penetrating the object, comprising a low-energy and high-energy radiation intensity radiation intensity.

[0117] 如上所述,后续的CT成像的扫描位置都是在DR图像上确定的。 [0117] As described above, the position of the subsequent CT imaging scan are determined on the DR image. 无论是使用自动识别的方式,还是人工指定的方式,都是首先在DR图像上取得一个行号,然后计算机将这个行号转换为承载机构高度,并命令控制器50驱动承载机构40运动到指定位置后,再进行CT成像。 Whether using automatic recognition mode, or manually specify manner, are first made in a DR image line number, the line number and the computer means to carry a high degree of conversion, command and control means 50 drives the carrier 40 is moved to the specified after the position, then the CT imaging.

[0118] 由DR成像流程可知,DR图像的每一行,对应于一个特定的承载机构40高度。 [0118] apparent from the DR imaging process, each row of DR image, corresponding to a specific height of the carrier means 40. 假设DR成像过程开始时承载机构高度值为0,成像过程中承载机构不断下降,每隔h毫米触发一次采集,那么DR图像中的第m行,其对应的承载机构高度为-m*h。 When the imaging process is started assuming DR height value of 0 means the carrier, the carrier means during the imaging falling, once every acquisition trigger mm h, then the m-th row in the DR image, which corresponds to the height of the support means -m * h. [0119] 图11示出了对DR图像进行处理以确定CT扫描位置的流程图。 [0119] FIG. 11 shows a flowchart of the DR image is processed to determine the position of the CT scan.

[0120] 在DR图像中,被检液态物品一般分为瓶底、液体部分、瓶颈、瓶盖等几部分,通过图像分析技术可以将其中的液体部分(可能有多层)提取出来,并确定各层CT扫描位置。 [0120] In the DR image, the inspected liquid article is generally divided into several bottom portion, a liquid portion, the bottleneck, caps and the like, which may be a part of the liquid (possibly multilayered) extracted by the image analysis, and determines The layers CT scan position.

[0121] 在步骤S310,对DR图像的高低能数据进行融合和平滑,得到噪声较小的单值DR图像。 [0121] In step S310, the data DR on the high and low energy images are fused and smoothed to give a single value of less noise DR image. 例如,高低能融合的具体方法可以是直接选择高低能数据中的一种作为融合结果,也可以是高低能数据的加权组合。 For example, low specific method can be fused directly select a low energy data as a result of the fusion may be a weighted combination of high and low energy data. 平滑的方法可以是使用高斯滤波器对图像进行滤波处理。 The method may be smoothed using a Gaussian filter performs a filtering process on the image.

[0122] 在步骤S311,提取平滑后DR图像中的被检液态物品(前景),去除空气(背景)。 [0122] In step S311, the smoothed extraction liquid articles (foreground) image of the DR, to remove air (background). 具体方法可以是设定一个阈值,将取值在该阈值以下的像素归为前景像素,其他像素归为背景像素。 The specific method may be set a threshold value, the pixel value below the threshold is classified as a foreground pixel, the other pixels classified as background pixels. 采用阈值来去除背景的原因在于:被检液态物品遮挡了射线,因此其对应的DR图像素值较低(DR图像记录的是射线的剩余强度)。 The reason why the threshold value to remove the background in that: the liquid article radiation shielding, so that lower values ​​of the pixel corresponding to FIG DR (DR residual intensity image recording radiation).

[0123] 在步骤S312,提取平滑后DR图像中的水平边缘像素。 [0123] In step S312, the extracted horizontal edge pixels in the image smoothed DR. 具体方法可以是:对DR图像的每个像素,计算其与垂直方向上相邻像素的差异值;如果这个差异值大到某个阈值以上,就认为这个像素属于水平边缘像素。 The specific method may be: DR image for each pixel, the pixel difference value calculation adjacent to the vertical direction; large if the difference value is above a certain threshold, the pixel is considered to belong to the horizontal edge pixels.

[0124] 在步骤S313,提取平滑后DR图像中的水平边缘行,水平边缘行对应于瓶底和液体的界面、液体和空气的界面、瓶盖和空气的界面或者容器中多层液体之间的界面。 [0124] In step S313, the smoothed DR image after the extraction of the horizontal edge lines, horizontal lines corresponding to the edges of the bottom and the liquid interface, the interface between the liquid and the air, and the air cap interface or multilayered liquid container interface. 具体方法可以是:对DR图像中沿水平方向的每一行,统计其水平边缘象素数和前景像素数的比例,如果比例大到某个阈值以上(比如50% ),则将这一行归为水平边缘行。 The specific method may be: DR for each line in the horizontal direction of the image, the statistical ratio of the number of pixels and the number of its horizontal edge foreground pixels, if a large proportion above a certain threshold (for example 50%), this line will be classified as horizontal edge line.

[0125] 在步骤S314,对DR图像进行垂直分区,并排除非液体区域。 [0125] In step S314, the DR image on a vertical partition, unless the liquid region side by side. DR图像中的各条水平边缘行将DR图像分成了多个区域,从下往上依次包括:瓶底、液体(根据密度的不同,可能有多层)、瓶内空气(如果有的话)、瓶盖等。 DR image rows each horizontal edge DR image into a plurality of regions, comprising from bottom to top: bottom, the liquid (depending on the density, there may be a multilayer), air in the vessel (if any), caps and so on. 通过制定筛选准则,可以排除非液体区域,具体准则如: Through the development of screening criteria, you can exclude non-liquid region, specific criteria such as:

[0126] a)在垂直方向上,行数小于某一阈值的区域,排除。 [0126] a) in the vertical direction, the number of lines is smaller than the area of ​​a certain threshold, to exclude. 行数较小的区域,也就是厚度很小的区域,有可能是瓶底、瓶盖、或容器内液体和容器顶部之间狭小的空隙(比如易拉罐内顶部的空气)。 A small number of lines area, i.e. the thickness of the small area, there may be a small gap (such as air at the top of the cans) between the bottom of the bottle, cap, or top of the vessel and the liquid in the container. 具体阈值的确定,可以通过调研各种液体包装容器的瓶底、瓶盖和容器内空气层厚度来确定。 Determine the specific threshold value may be, the container cap and the air layer thickness is determined by the research of various liquid packaging container bottom.

[0127] b)在水平方向上,各行的平均前景像素数小于某个阈值的区域,排除。 [0127] b) in the horizontal direction, the average number of pixels of the foreground of each row region is smaller than a certain threshold, to exclude. 这些区域往往对应于细长的瓶颈。 These regions usually correspond to the elongated bottleneck. 具体阈值的确定,可以通过实现获取各种液体包装容器瓶颈的宽度来确定。 Determine the specific threshold value, the width can obtain packaging containers of various liquids is determined by implementing the bottleneck.

[0128] 在步骤S315,确定液体区域(可能有多个)的CT扫描位置,完成液体的分层定位。 [0128] In step S315, the area determining the liquid (possibly multiple) CT scan position, the positioning complete delamination liquid. 排除非液体区域后,剩下的区域(可能有多个)归为液体区域。 After removing the non-liquid region, the region (there may be more) remaining area classified as a liquid. 取这些区域在高度方向上的中心行,作为CT扫描位置。 These regions taking the central row in the height direction, a CT scan position.

[0129] 以上描述的是自动确定CT扫描位置的过程。 [0129] The above is a CT scan to determine automatically the position of the process described. 但是,在手动指定扫描位置的情况下,操作员通过输入装置65在显示的DR图像上直接指定要进行CT扫描的行,作为CT扫描位置。 However, in case of manually specifying the scanning position, the operator via the input device 65 to specify the image displayed on the DR line directly to the CT scan, a CT scan position.

[0130] 图12示出了CT成像过程,而图13示出了在CT成像过程中CT投影数据的排列方式。 [0130] FIG. 12 illustrates a CT imaging procedure, while FIG. 13 shows the arrangement of the CT projection data of the CT imaging process.

[0131] 如图12所示,在确定了CT扫描的位置之后,执行CT成像过程,也就是在所执行的CT扫描位置,进行CT成像,生成关于被检物一个断层的密度和原子序数图像,以进行液体密度和原子序数的测量。 [0131] 12, after determining the position of a CT scan, a CT imaging procedure, a CT scan position is performed, the CT image to generate a fault on the image density and atomic number analyte to measure liquid density and atomic number. 如上所述,由于仅仅对典型的位置进行CT扫描,所以可以大大节省通关时间。 As described above, since only the position of a typical CT scan, it is possible to greatly reduce clearance.

[0132] 在步骤S410,计算机60给控制器50发送命令,驱动承载机构40旋转预定角度,例如I度。 [0132] In step S410, the computer 60 sends a command to the controller 50, the drive mechanism 40 to rotate a predetermined angle of the carrier, e.g. I degree. 控制器50在承载机构旋转运动的过程中,通过角度信息获取单元54实时监控承载机构角度。 The controller means 50 during the rotational movement of the carrier, the carrier acquisition time monitoring unit 54 through an angle means the angle information.

[0133] 在步骤S411,当转过I度,控制器50给探测和采集装置40发送一个触发信号。 [0133] In step S411, the I degrees when turned, the controller 50 transmits the detection and collection means 40 to a trigger signal. 探测和采集装置40接收到触发信号后,对每个探测器的输出信号进行一次采集,并保存到其内置的缓冲器中。 After the detection and collection means 40 receives the trigger signal, the output signal of each detector is once collected and stored in its built-in buffer. [0134] 然后,在步骤S412,判断累计转动角度是否达到一周。 [0134] Then, at step S412, the total rotation angle is determined whether the week. 如果未达到一周,则流程转到步骤S410,继续上述的操作过程。 If not reached one week, the flow proceeds to step S410, the above operation continues.

[0135] 如果累计转动角度达到指定角度(比如360度)后,在步骤S413旋转运动停止,控制器50不再给探测和采集装置30发送触发信号。 [0135] If the accumulated rotation angle reaches a predetermined angle (such as 360 degrees), the rotational movement of the step S413 is stopped, the controller 50 is no longer a detection and collection means 30 transmits a trigger signal. 计算机60从探测和采集装置30中读取采集到的高低能探测器信号,排列为数据矩阵的形式,成为CT投影数据,如图13所示。 The computer 60 reads from the detection and collection device 30 can be collected by the detector signal level, are arranged in the form of a data matrix, it becomes the CT projection data, as shown in Fig. CT投影数据的每个像素,记录了射线穿透物体后剩余的强度,包括低能射线强度和高能射线强度。 Each CT projection data of the pixel, the residual strength after the recorded object penetrating radiation, comprising a low-energy and high-energy radiation intensity radiation intensity.

[0136] 在步骤S414,计算机60利用双能重建算法,根据高低能CT投影数据,重建得到断层上的密度和原子序数图像,即CT图像。 [0136] In step S414, the computer 60 using a dual energy reconstruction algorithm, according to high and low energy CT projection data, reconstructed image density and atomic number obtained on the fault, i.e., the CT image. CT图像中的每一个像素,记录了被检物体在该像素对应位置的密度和原子序数。 CT images of each pixel, the record density and atomic number inspected object corresponding to the pixel position.

[0137] 下面说明从高低能CT投影数据重建断层图像的过程。 [0137] The following describes the process of a tomographic image reconstructed low energy projection data from the CT.

[0138].CT数学原理 [0138] .CT Principia Mathematica

[0139] 将二维分布u(x,y)沿着某个方向Θ求线积分,便得到一维的函数pe (t),该函数称为u(x,y)在Θ角度的投影。 [0139] The two-dimensional distribution u (x, y) along a direction Θ request line integral, one-dimensional function will pe (t), the function is called u (x, y) in the projection angle Θ. 如果能够得到各个方向的投影pe (t),那么可以根据Radon变换精确计算得到二维分布u (X,y)。 If the projection can be obtained in all directions pe (t), then the two-dimensional distribution can be obtained u (X, y) is calculated accurately according to the Radon transform. 从投影得到二维分布的过程称为重建。 Obtained from the two-dimensional distribution of the projection process is called reconstruction.

[0140] 实际应用中,X光机和探测器围绕物体旋转一圈,便测量得到物体的某个切片的衰减系数分布在各个方向的投影,从而可以根据CT原理重建得到物体切片的衰减系数二维分布。 [0140] In practical applications, X-ray detector around the object and the revolution, then an attenuation coefficient measured projection slice of the object distributed in all directions, can be obtained according to the attenuation coefficient of the object slice CT reconstruction principle two-dimensional distribution.

[0141] •基材料分解模型 [0141] • based material decomposition model

[0142] 在小型X射线安全检查系统所涉及的能量范围内(<200keV),物质线衰减系数可以用下面的解析表达式(I)来近似表示。 [0142] In the energy range of small X-ray security inspection system involved (<200keV), linear attenuation coefficient of the material can be approximated by the following analytical expression (I).

[0143] [0143]

Figure CN102565102BD00141

[0146] 公式(I)中,fp(E)表示光电效应截面随着能量的变化关系,fra(E)表示康普顿散射截面随着能量的变化,fp(E)与fKN(E)均有已知的解析表达式。 [0146] Formula (I) is, fp (E) represented by the photoelectric effect of the cross-sectional relationship between the energy varies, fra (E) represented by the Compton scattering cross section with the change in energy, fp (E) and fKN (E) are there are known analytical expressions. 常数B1和&2与物质的原子序数、质量数和密度有关,其表达式如(2)和(3)式所示,其中Z表示原子序数,M表示质量数,P表示密度(g/cm3),n为常数。 2 & constants B1 and the atomic number, mass and density of the material about which such expressions (2) and (3) shown in the formula wherein Z represents the atomic number, M is the mass number, P represents the density (g / cm3) , n is a constant.

[0147] 由于每种物质的线衰减系数都可以被公式⑴中的两个系数B1和&2唯一确定,因此可以选取两种基材料,比如碳和铝,用基材料的线衰减系数的线性组合表示其他所有材料,如下式⑷所示:[0148] μ (E) = Id1 μ i (E)+b2 μ 2 (E) (4) [0147] Since the linear attenuation coefficient of each substance can be two coefficients B1 and in formulas & ⑴ 2 is uniquely determined, it is possible to select two basic materials, such as carbon and aluminum, with a line-based material attenuation coefficients of the linear combination represents all other materials, as shown ⑷ formula: [0148] μ (E) = Id1 μ i (E) + b2 μ 2 (E) (4)

[0149] 其中,μ (E)为任意一种材料的线衰减系数,U1(E)和μ2(Ε)为所选的两种基材料的线衰减系数,匕和b2称为基材料系数。 [0149] where, μ (E) is the line attenuation coefficient of any material, U1 (E) and μ2 (Ε) of two lines selected based material attenuation coefficients, referred to as base material, and b2 dagger coefficients.

[0150] 按照公式(5),定义原子序数的2倍与质量数的比值与密度的乘积为特征密度。 [0150] in accordance with equation (5), the definition of two times the product of the ratio of the atomic number density of the number of quality feature density.

Figure CN102565102BD00151

[0152] 假设两种基材料的原子序数和特征密度分别为(K)和(Z2W),那么根据上面的公式(I)~(4)可以推导出任意一种材料的原子序数和特征密度的表达式如下: [0152] atomic number and characteristic density assumptions are two basic materials (K) and (Z2W), then according to the above formula (I) ~ (4) may be derived any one of the atomic number and characteristic density of the material of expression is as follows:

Figure CN102565102BD00152

[0155].基材料投影模型 [0155] The base material projection model

[0156] X光管产生的能谱通常为连续谱,探测器对X射线的能量响应函数也不是常数。 [0156] X-ray tube spectra generated generally continuous spectrum, X-ray detector energy response function is not constant. 假设能谱N (E)与能量响应函数Pd (E)的乘积为S(E),并且将S (E)归一化, Suppose spectrum N (E) a product of a function of Pd (E) is the energy response of S (E), and S (E) normalized,

Figure CN102565102BD00153

[0158] 那么一条投影线上的投影值的表达式为如下的积分式: [0158] then the expression of a projection value for projection line integral as follows:

Figure CN102565102BD00154

[0160] 公式(9)中,Itl和I分别表示射线被物体衰减前和衰减后的探测器读数值,Effl表示射线的最大能量,I表示射线穿过的路径。 [0160] Equation (9), Itl and I respectively represent the radiation attenuation of the object before and after the decay detector readings, Effl represents the maximum energy ray, I represents the path of the rays through.

[0161] 公式(9)即为实际系统的测量投影值P与二维分布μ (X,y)的关系。 [0161] Equation (9) is the two-dimensional distribution relationship between P and μ (X, y) of the measured actual value of the projection system. 可以看出,由于X射线多色性,公式(9)并不表示μ (x, y)沿着某条直线的线积分,因而并不满足CT数学原理的要求。 As can be seen, since the X-ray pleochroism, Equation (9) does not mean μ (x, y) of a line integral along a straight line, and thus does not meet the requirements of the mathematical principles of CT. 常规重建算法忽略这个不一致性,重建得到的μ U,y)图像含有杯状的伪影,称为硬化伪影。 Conventional reconstruction algorithm ignores this inconsistency, the resulting reconstructed μ U, y) comprising a cup-shaped image artifact known as hardening artifacts.

[0162] 现有的双能CT方法先采用常规重建算法得到两组μ (x,y),然后计算原子序数和密度等信息。 [0162] The method of the conventional dual-energy CT reconstruction algorithm obtained by a conventional two μ (x, y), and then calculate the atomic number and density information. 但是这样不能消除射线多色性的影响。 But this does not eliminate the effect of multi-colored rays. 本发明采用基材料分解的思路解决了这个问题。 The present invention uses the idea based material decomposition solves this problem.

[0163] 将基材料分解模型代入到公式(9)中,可以得到基于基材料系数的投影值表达式: [0163] The base material decomposition model is substituted into Equation (9) can be obtained based material expression projection values ​​based on coefficients:

Figure CN102565102BD00155

[0165] 将上式中的沿着路径I的积分用下面的式子表达: [0165] The above formula expressed by the following formula I integral along the path:

[0166] / (x, y) dl = B1 (11) [0166] / (x, y) dl = B1 (11)

[0167] / (x, y)dl = B2 (12) [0167] / (x, y) dl = B2 (12)

[0168] 按照上述(11)、(12)两式定义,称B1和B2为基材料系数Id1 (x, y)和匕“^)的投影。假设获取到了每个角度下的完整的基材料系数投影,那么便可以根据CT重建理论重建得到基材料系数匕和b2的分布,从而根据基材料分解模型计算出物体的原子序数和特征密度分布,以及任意能量下的线衰减系数值。 [0168] in accordance with (12) two defined in formula (11) above, called B1 and B2 as a base material coefficients Id1 (x, y) and dagger "^) projection assumed acquired a complete based material at each angle projection coefficients, then it can be obtained based material distribution coefficient b2 of the dagger and reconstructs the CT theory to calculate the atomic number and characteristic density distribution of an object in accordance with the base material decomposition model, and a line at an arbitrary energy attenuation coefficient values.

[0169].基材料系数投影的求解[0170] 双能CT在两个能量下采集投影数据,便得到如下的双能投影数据: . [0169] Solving the projection coefficients based material [0170] dual-energy CT projection data is acquired at two energy, we will have a dual-energy projection data as follows:

[0171] [0171]

Figure CN102565102BD00161

[0173] 在测量得到(Pl, ρ2)后,可以根据方程(13)和(14)求解得到(B1, B2)。 After [0173] the measured (Pl, ρ2), can be obtained (B1, B2) and in accordance with (14) Solving equation (13). 但是由于上述两个方程均为对数积分方程,无法解析求解。 However, due to the above two equations are logarithmic integral equations can not be solved analytically. 非线性迭代求解方法通常计算量很大,并且不容易得到稳定解。 Nonlinear Iterative solution typically computationally intensive, and is not easy to obtain a stable solution.

[0174] 注意到,当射线穿过厚度为Cl1和d2的基材料I和2后,测量到的双能投影如下面的表达式: [0174] Note that when the rays pass through the thickness of the base material and d2 Cl1 I and 2, the dual-energy projection measured as the following expression:

[0175] [0175]

Figure CN102565102BD00162

[0177] 对比(13)、(14)和(15)、(16)可以看出,假设测量到的投影数据对(Pl,p2)相同,那么基材料投影数据对(BnB2)与基材料的厚度组合(Clpd2)是完全相同的。 [0177] Comparative (13), (14) and (15), (16) can be seen, assuming the measured projection data (Pl, p2) identical, then the projection data based material (BnB2) with the base material the combined thickness (Clpd2) are identical.

[0178] 测量不同厚度组合下的双能投影,就可以得到双能投影数据对(Pl,P2)与基材料系数投影数据对(B1, B2)的对应关系,形成查找表。 [0178] dual-energy projection measured under different combinations of thickness, can be obtained for the dual-energy projection data (Pl, P2) with the base material correspondence between the coefficient data of the projection (B1, B2) to form a look-up table. 根据(Pl,P2)计算(B1, B2)就可以依据查找表、利用线性插值实现,代替复杂的求解过程。 The (Pl, P2) is calculated (B1, B2) can be based on a lookup table, using linear interpolation to achieve, in place of the complex solution process.

[0179] 图14示出了测量液体属性的过程。 [0179] FIG. 14 shows a process of measuring properties of the liquid.

[0180] 如图14所示,在步骤S510,对密度图像和原子序数图像进行融合和平滑,得到噪声较小的单值CT图像。 [0180] As shown, in step S510, the image density and the atomic number 14 and smoothing image fusion, single values ​​results in a smaller noise CT image. 融合的具体方法可以是直接选择密度图像和原子序数图像中的一种作为融合结果,也可以是两者的加权组合。 Specific fusion may be direct select one density image and the atomic number of the image as a fusion result may be a weighted combination of both. 平滑的方法可以是使用高斯滤波器对图像进行滤波处理。 The method may be smoothed using a Gaussian filter performs a filtering process on the image.

[0181] 在步骤S511,提取平滑后CT图像中的被检物(前景,包括液体及其包装),去除空气(背景)。 [0181] In step S511, the smoothed CT image after the extraction of the test object (foreground, including liquids, and packaging), to remove air (background). 具体方法可以是设定一个阈值,将取值在该阈值以上的像素归为前景像素,其他像素归为背景像素。 The specific method may be set a threshold value, the pixel value above the threshold is classified as a foreground pixel, the other pixels classified as background pixels. 这是因为空气的密度和原子序数几乎为0,而被检液态物品的密度和原子序数则相对较大。 This is because the air density and atomic number is almost zero, while the inspected liquid article is relatively large atomic number and density.

[0182] 在步骤S512,在前景像素中提取液体像素。 [0182] In step S512, the pixel extraction liquid in the foreground pixels. 具体方法可以是:首先建立一个和CT图对应的二值图像,前景像素的取值为1,背景像素的取值为O ;然后对此二值图像进行多次腐蚀运算,每次腐蚀一个像素,最后取值为I的像素为液体像素。 The specific method can be: first establish a corresponding binary image of FIG CT, is a foreground pixel value, the pixel value of the background is O; then this binary image erosion operation a plurality of times, each time a pixel corrosion the last pixel value of the liquid I of the pixel. 这是因为液体总是在包装物的内部,通过多次腐蚀可以逐步地去除包装物。 This is because the liquid is always within the wrapper, the wrapper can be gradually removed by etching a plurality of times. 腐蚀的次数可以通过实现确定包装物的厚度来设定。 Etching times can be set by determining the thickness of the package is achieved.

[0183] 在步骤S513,统计CT图中所有液体像素的平均密度和平均原子序数,作为本次测量的输出结果。 [0183] step S513, the statistical average of the CT image density of all the pixels of the liquid and the average atomic number, the present measurement result output.

[0184] 另外,如果在DR图像分析过程中确定液态是分层的,则针对每层液体执行如上所述的步骤,进而判断各层液体是否是可疑的。 [0184] Further, if it is determined in the liquid DR image analysis process is hierarchical, the steps described above is performed for each liquid, the liquid is further determined whether the layers suspicious. 最终,向操作员报告最终的检查结果。 Ultimately, the final report of the inspection results to the operator.

[0185] 另外,存在数据库中的液态物品信息不足,需要进行扩充的情况。 [0185] In addition, there is a database of liquids lack of information, the need for expansion of the situation. 换言之,数据库中的各项数据内容,可以由厂家在系统出厂前由供应商填充,同时也允许在系统出厂后操作员对数据库进行扩展。 In other words, the data contents of the database can be filled by the supplier before the system is shipped by the manufacturer, while also allowing the system to expand the database after the factory operator. 例如在市面出现了一种新的饮料的情况下,操作员可以从该饮料的样本产生该饮料的参考密度和参考原子序数。 For example, a case where there is a new beverage in the market, the operator can generate a reference density of the beverage from the sample and the reference of the atomic number of beverage. 图15示出了对数据库进行扩展的过程。 FIG 15 shows a process of the database extensions. [0186] 在数据库中填充一条记录的基本方法是:首先实测被检样品确定其参考密度和原子序数,然后在树状的标识系统为其建立一个唯一的标识,并将标识、参考密度和原子序数按照标识一起存入数据库中。 [0186] The basic method of filling a record in the database are: Found first test sample is determined with reference to their density and atomic number, and to establish a unique identification system for identification of the tree, and the identifier, the reference density and atomic identification number in accordance with the sequence stored in the database.

[0187] 如图15所示,在步骤S610,操作员给系统上电,并登录数据库扩展界面。 [0187] As shown in FIG. 15, in step S610, the system operator to power on and log database to the expansion interface. 系统自检后进入就绪状态。 When the test is ready to enter the state system. 操作员将希望被加入到数据库中的液体样品放在承载机构40上。 The operator will want the liquid sample is added to the database 40 is placed on the support means. 在步骤S611,从计算机60向控制器50发出命令,触发射线源10和探测和采集装置30进行DR成像,并在步S612A按照如上所述的方式自动确定液体位置或者在步骤S612B操作员也可在DR图上人工指定液体位置。 In step S611, sent from the computer 60 to the controller 50 commands the trigger radiation source 10 and the detection and collection DR imaging device 30, and automatically determines the position of the liquid in the manner described above in step S612A or step S612B operator may also artificial designated position on the liquid DR FIG.

[0188] 在步骤S613,在自动或人工确定的液体位置进行CT成像,并在步骤S614分析CT图像以从CT图像获取液体的参考密度和原子序数。 [0188], the CT imaging of the liquid automatic or manual position determination step S613, the analysis and CT images acquired by the reference density and atomic number of the liquid from the CT image at step S614.

[0189] 然后,在步骤S615,操作员对液体样品设定一个标识,比如可口可乐,然后在步骤S616将液体标识与其参考密度和原子序数绑定后,保存到数据库中。 [0189] Then, at step S615, the operator identifies a set of sample liquid, such as Coca Cola, then at step S616 after the reference liquid density and atomic number identification bound thereto, saved to the database.

[0190]【第二实施方式】 [0190] [Second Embodiment

[0191] 上面的第一实施方式描述的是每次检测单件液态物品的情况,下面结合图16~ [0191] The above described first embodiment is a case where each detection of a single piece of liquid article, in conjunction with FIG. 16 to

19详细描述同时检测多件液态物品的操作过程。 During operation simultaneously detected liquid article 19 more than the detailed description. 第二实施方式与第一实施方式的区别在于,因为存在多件液态物品,需要在CT成像完成之后,在显示器上显示的成像结果的位置与承载机构上的物体的位置相对应,从而便于操作员弄清那件液态物品是可疑的。 The second embodiment differs from the first embodiment in that, since there is more than liquids, it is necessary after the CT imaging is completed, the position of the object on the imaging position of the bearing means results are displayed on the display corresponds to, thereby facilitating the operation members clarify that piece liquid article is suspicious. 图16A和图16B示出了根据本发明第二实施方式的检测多件液态物品的情况下重建的CT图像的示意图。 16A and 16B show a schematic view of the reconstruction of the case of the detection of the second embodiment of the present invention is a multi-piece embodiment of the liquid articles CT image.

[0192] 例如,操作员以俯视的方式来观察承载机构上的被检物,这就要求检查结束后各层CT图像上各物体的位置必须与承载机构40俯视图一致。 [0192] For example, as to the operator to observe the top view of the test object on the support means, which requires the position of each object on the CT image layers must be consistent with the carrier means 40 in FIG After the inspection plan.

[0193] 图17A-17K示出了在CT成像完成之后,如何对CT重建图像和/或承载机构进行旋转使其与CT扫描之前物体的相对位置相一致的过程。 [0193] FIGS. 17A-17K illustrate the relative position after the CT imaging is completed before, how to rotate it with CT in CT reconstruction image and / or object support means consistent process.

[0194] 图17A示出了在第一次CT成像开始时,承载机构40的俯视图,其中用箭头指示承载机构的角度。 [0194] FIG 17A shows a top view of the CT imaging at the first start, the carrier mechanism 40, wherein the angle indicated by the arrow of the support means. 图17B示出了在第一次CT图像旋转之前的CT图像,它与第一次成像开始时的承载机构的俯视图是一致的,其中的虚线标识承载机构的旋转范围。 17B shows a CT image prior to the first CT image rotation, which is a plan view of the first bearing means at the start of imaging is the same, the rotation range of the broken line which identifies the support means. 图17C示出了在第一层CT图像旋转后的图像,由于旋转角度是零,因此实际上无需对该层CT图像进行旋转。 17C shows an image in the CT image after rotating the first layer, since the rotation angle is zero, so the layers without actually rotating the CT image.

[0195] 图17D示出了在第η次CT成像开始时,承载机构的俯视图。 [0195] FIG 17D shows the first sub-η CT imaging begins, a plan view of the support means. 从图17D中可以看出,在第η次CT成像开始时,承载机构相比于第一次CT成像前的情形,具有一个角度。 As it can be seen in FIG. 17D, in the first CT imaging start η times, compared to the case where the carrier means before the first CT imaging, at an angle. 图17Ε示出了在第η次CT图像旋转之前的图像,它与第η次成像开始时承载机构的俯视图是一致的。 FIG 17Ε shows an image prior to the rotation of the CT image η times, it means a top view of the carrier at the beginning of the first imaging session was consistent η. 图17F示出了对图17D中的图像进行旋转,使其与第一层CT图像对齐的示意图。 FIG 17F shows the image of FIG. 17D is rotated schematic aligned with the first layer so as CT image.

[0196] 图17G示出了在最后一次CT成像开始时,承载机构的俯视图,可以看出此时的承载机构相比于第一次CT成像开始时具有一个角度。 [0196] FIG 17G shows at the last CT imaging begins, a plan view of the carrier means, it can be seen at this time in comparison to the support means having a first angle when CT imaging begins. 图17Η示出了在第N次CT图像旋转之前的图像,它与第N次成像开始时承载机构的俯视图是一致的。 FIG 17Η shows an image before the N-th rotation of the CT image, which means a top view of the carrier at the beginning of the N-th image is the same. 图171示出了对图17Η中的图像进行旋转,使其与第一层CT图像对齐的示意图。 FIG 171 shows the image of FIG 17Η rotated schematic aligned with the first layer so as CT image.

[0197] 图17J示出了最后一次CT成像结束后,承载机构的俯视图,其中相比于第一次CT成像开始之前的情况,具有一个旋转角度。 [0197] FIG. 17J shows the end of the last CT imaging, a plan view of the carrier mechanism, compared with the case where before the start of the first CT imaging, having a rotation angle. 图17Κ示出了在成像结束后对承载机构进行旋转使其与第一次CT成像所获得的图像一致。 FIG 17Κ shows the same rotating it with the first CT imaging support means at the end of the image obtained by imaging.

[0198] 在所有CT成像过程结束后,对各层CT图像和承载机构进行一次角度调整。 [0198] After the end of the process all the CT imaging, the CT image of the respective layers and a support means for angular adjustment. 首先,根据各次CT成像开始时的承载机构角度(这个角度是可以通过角度信息获取单元54来得到的),对各层CT图像进行旋转处理,使同一物体在各层CT图像中的位置保持一致,比如对齐到第一层CT。 First, when the angle of the carrier means each time CT imaging is started (this angle is the angle acquisition unit 54 to obtain the information), the layers CT image rotation process, the position of the same object in the respective layers in the CT image is maintained uniform, aligned to the first layer such as CT. 然后,调整承载机构的角度,使承载机构的俯视图与CT图像保持一致。 Then, adjust the angle of the support means, so that a plan view of the carrier mechanism consistent with the CT image.

[0199] 例如,假设一共进行了N次CT成像,第η次CT成像开始时承载机构角度为α η,结束时承载机构角度为βη,在俯视图上承载机构以逆时针方向转动。 [0199] For example, assuming a total of N times CT imaging performed, the carrier mechanism start angle [eta] of times of CT imaging α η, the angle of the support means βη end, rotates in the counterclockwise direction in plan view on the carrier means. 为了使物体在第η层CT图像中的位置都与第I层上的位置保持一致,只需将第η层CT图像按逆时针方向旋转角度α n- ai即可。 In order to make the position of the first object in the CT image η layer are consistent with the position of the upper layer I, only the first layer is η CT image rotates counterclockwise to the angle α n- ai. 旋转图像后,为了使物体在承载机构俯视图与CT图保持一致,只需将承载机构按逆时针方向旋转角度360-( Pn-Ci1)即可。 After rotating the image, the object in order to make a plan view of FIG CT consistent support means, the carrier means simply rotates counterclockwise angle 360- (Pn-Ci1) can.

[0200] 图18示出了在多件被检物体的情况下进行检查的流程图。 [0200] FIG. 18 shows a flowchart of the inspection object to be detected in the case of multi-piece. 如图18所示,在步骤S710,操作员给系统上电,并登录检查界面,系统自检后进入就绪状态。 As shown, in step S710, the system operator to power on and log check screen, the self-test system 18 enters the ready state. 然后,操作员将多件被检物,例如物体A和物体B直接放在承载机构40上并按下检查按扭。 Then, the operator will be more than the subject, for example the object A and the object B placed directly on the support means 40 and presses the check button. 这里,假设物体A放置在承载机构的右上角位置,而物体B放置在承载机构的左下角位置。 Here, assuming that the object A is placed in the top right corner of the carrier means, while the object B placed in the lower left hand corner of the support means. 另外,操作员输入物体A和物体B各自的标识信息。 Further, the operator inputs the object A and the object B are identification information.

[0201] 在步骤S711,基于物体A和物体B的标识信息从数据库中检索各自的参考密度和参考原子序数。 [0201] In step S711, based on the identification information of the object A and the object B are retrieved from the database of each of the reference density and reference atomic number. 接下来,在步骤S712,操作员按下启动按钮开始按照与如上所述相同的方式执行DR扫描,以生成DR图像。 Next, at step S712, the operator presses the start button to begin DR scanned in the same manner as described above, to generate a DR image.

[0202] 在获得DR图像后,在步骤S713A,对DR图像进行分析,自动确定CT成像的扫描位置,或者在步骤S713B,由操作员操作诸如鼠标之类的输入装置65来指定要进行CT扫描的位置。 [0202] After obtaining the DR image, at step S713A, the DR image is analyzed to automatically determine a scanning position of CT imaging, or step S713B, operated by an operator input device such as a mouse 65 to specify a CT scan s position. 这样,由于仅仅对液态物品中有代表性的位置进行CT扫描,从而加快了检查速度,而不会降低检查质量。 Thus, since only the position of the liquid articles typical CT scan, thereby speeding up the inspection speed without degrading the quality inspection.

[0203] 在确定了CT扫描的位置之后,在步骤S714执行CT扫描过程,也就是针对上述确定的位置对液态物品进行CT扫描,获得CT扫描数据,并且根据重建算法重建CT图像。 [0203] After determining the location of the CT scans, CT scans performed in the process step S714, determination is performed for the position of the liquid articles CT scan, CT scan data is obtained, and the reconstructed CT image according reconstruction algorithms. 该CT图像的每个像素代表了液态物品中相应部分的密度和原子序数。 Each pixel of the CT image density and atomic number represent corresponding parts in the liquid articles. 当液体存在多层的情况下,针对各层进行CT扫描。 In the case where the presence of a liquid multilayer, the respective layers for a CT scan.

[0204] 在步骤S715和S716,最后一次CT成像结束后,按照如上所述的方法对承载机构角度和各层CT图像角度进行调整,使各层CT图像中各物体的位置保持一致(比如对齐第一层CT),同时与物体在承载机构上的实际位置保持一致(比如和俯视图一致),以便于区分物体B和物体A。 [0204] In step S715 and S716, after the end of the last CT imaging, according to the method described above to adjust the angle of the support means and the angle of the CT image layers, the layers of each object in the image of CT consistent (for example, aligned a first layer CT), while maintaining consistent (for example, a top view and FIG consistent) and the actual position of the object on the carrier means, in order to distinguish the object B and the object A.

[0205] 在步骤S717,对每层CT图像进行图像分割处理(比如使用分水岭算法),得到其中每件被检物的液体区域,在步骤S718统计每个液体区域内各像素的密度和原子序数均值,在步骤S719并将其与参考密度和原子序数相比较,据此在步骤S720判别该件被检物的该层液体是否可疑。 [0205] In the step S717 is, the CT images of each image division processing (such as using a watershed algorithm), to give the region where each analyte is a liquid, and in step S718 statistical density and atomic number of each pixel of the liquid in each zone It means, and compares it with the reference density and atomic number at step S719, whereby step S720 is determined in the liquid layer of the member of the detected object is suspicious.

[0206] 在步骤S721,汇总各层检查结论并提示给操作员。 [0206] In step S721, the summary and conclusions layers of checks presented to the operator. 一种汇总方法是:仅当所有CT图像中所有液体区域都被判为安全液体时,本次检查的结论为“安全”;否则本次检查的结论即为“可疑”。 An aggregate approach is: only when all CT images of all the liquid regions are judged as safe liquid, the present examination concluded that "security"; otherwise, the conclusions of this inspection is "suspicious." 另外,对每层CT图像进行彩色化处理并显示给用户,CT图中被判为可疑物品的被检物使用一种颜色(比如红色),判为安全液体的使用另一种颜色(比如绿色)。 In addition, the CT images of each color and displayed to the user process, CT FIG suspicious objects judged as the test object with a color (such as red), judged as a liquid safe another color (e.g., green ).

[0207] 以上说明的是同时检查两件液态物品的情况,当要同时检查更多件液态物品时,为了便于操作人员看弄清楚各个液态物品的位置,如图19所示,对承载机构承载液态物品的表面上划分出多个区域,例如图19中的A区、B区、C区和D区,这样操作人员可以将各件液态物品放置在相应的区域中,并且针对各个区域来输入各自的液体标识信息。 [0207] Note that while the above inspection of liquid articles in two, when the member to be checked more liquids simultaneously, in order to facilitate the operator to see the position of the respective liquid articles to find out, as shown, the carrier support means 19 surface of the liquid article on a plurality of divided regions, for example, FIG. 19 a region, B region, C region, and D region, so that the operator can be various pieces of liquid articles placed in the corresponding region, and for each input region identification information of each of the liquid.

[0208]【第三实施方式】 [0208] [Third Embodiment

[0209] 为了进一步提高检测效率以及防止细长的被检液态物品直接置于承载机构上导致检测时容易产生不稳定而影响检测效果的问题,第三实施方式提出将多件物体放置在分格桶中。 [0209] In order to further improve the detection efficiency and preventing elongate liquid article placed directly on the carrier means problems caused instability prone to affect detection results of the detection, the third embodiment proposes a multi-piece object is placed ruled bucket.

[0210]因此,第三实施方式与第二实施方式的区别在于,在检查多件物体的过程中使用了分格桶。 [0210] Thus, the difference between the third embodiment and the second embodiment in that, in the use of a divided barrel pieces of object inspection process. 下面结合附图20~25来详细说明根据本实施方式的检测设备的具体操作过程。 Described in detail below with specific operation detection apparatus according to the present embodiment is 25 ~ 20 of the accompanying drawings.

[0211] 图20不出了根据本实施方式的分格桶的侧视图,图21不出了分格桶的俯视图,而图22不出了分格桶的底视图。 [0211] Figure 20 a side view of not divided barrel according to the present embodiment, a top view of FIG. 21 not divided barrel, and FIG. 22 not a divided barrel bottom view.

[0212] 如图20所示,分格桶70包括底部和与底部耦合的侧壁。 [0212] shown in Figure 20, a divided barrel 70 includes a bottom and side walls and the bottom coupling. 在底部的下表面上设置有多个锥形或者其他形状的凸起。 On the lower surface of the bottom is provided with a plurality of tapered protrusions, or other shapes. 这三个锥形凸起可以插入到承载机构40上对应的定位孔中,从而在承载机构旋转过程中,分格桶70与承载机构40 —起旋转,防止在二者之间产生相对运动。 These three tapered projections can be inserted into the positioning holes 40 corresponding to the bearing means, so that during rotation of the support means, a divided barrel 70 and the carrier means 40-- rotates together and prevent relative movement therebetween.

[0213] 另外,如图20所示,在侧壁的顶部一周设置有凸缘,方便操作员抓握和搬运。 [0213] Further, as shown in FIG. 20, at the top of the sidewalls is provided with a flange week operator easy grasping and carrying. 侧壁是圆柱状的或者是锥形的,并且可以由具有弹性侧材料,例如聚乙烯(PE)或者铝制成。 Side walls are cylindrical or conical, and may be made of an elastic material side, for example, polyethylene (PE) or aluminum.

[0214] 图21是三种分格桶的俯视图。 [0214] FIG. 21 are three divided barrel plan view. 如图所示,在由底部和侧壁形成的空间中设置有一个或者多个分格部件,将该空间按照需要分成多个空间,分别用于放置液态物品。 As shown, disposed in the space formed by the bottom and side wall with one or more sub-grid members, the needed space into a plurality of spaces, respectively, for placing the liquid articles. 这样,当要同时检测多件液态物品时,将这多件液态物品分别放置在由分格部件所划分的空间中,对这些液态物品同时进行检测。 Thus, when the pieces to be simultaneously detected liquid article, these pieces are placed in the space of liquid articles ruled by a member of the divided, for simultaneous detection of the liquid article. 在这种情况下,可以在侧壁的外表面上设置标记,便于在检测时对检测容器中物品的定位。 In this case, the mark may be provided on the outer surface of the side walls, to facilitate positioning of the container is detected upon detection of an article. 例如,当检测到四件物品中有一瓶可疑时,可以根据该件物品相对于侧壁上设置的标记的相对位置,来向用户报告是哪一件物品是可疑的。 For example, when there are four items detected suspicious bottle, the relative position may be provided on the side wall of the mark based on the items, an item which is to report to the user is a suspicious.

[0215] 例如,如图21的左侧图所示,在分格部件的上侧设置有截面为预定尺寸的圆形的标记,或者某个分格部件的长度比其他的小,由此作为定位液态物品所用的标记。 [0215] For example, as shown on the left side of FIG. 21, the upper member is provided with a sub-grid section other small round mark length of a predetermined size, or a ratio of the ruled member, whereby as positioning marker used in the liquid articles.

[0216] 图22是分格桶的底视图。 [0216] FIG. 22 is a bottom view of a divided barrel. 在底部的下表面上均匀分布有三个凸起。 On the lower surface of the bottom three projections distributed uniformly. 但是这三个凸起分布也可以是不均匀的。 However, these three projections may be non-uniform distribution.

[0217] 图23示出了在检查过程中如何自动检测分格桶和标记的过程。 [0217] FIG. 23 shows a process how to automatically detect a divided barrel and a mark in the inspection process. 如上所述,分格筒具有特定的结构,可以用图像处理中常用的模版匹配的方法检测。 As described above, a divided barrel having a specific structure, can be detected by methods commonly used in image processing of template matching. 以带十字分格的第一种桶为例,在步骤S810可以首先建立一幅带有十字的模板图像,并将此模板的中心置于待识别的CT图像中心,得到匹配值。 In a first sub-grid of the tub with a cross, for example, at step S810 may first establish a template image with a cross and the center of the template to be identified is placed in the center of the CT image, to obtain a matching value.

[0218] 然后在步骤S811,判断该匹配值是否大于预定的阈值,如果结果是否定的,则后旋转模板图像,直到模板图像与CT图像的匹配程度最大为止。 [0218] Then, in step S811, it determines whether or not the matching value is greater than a predetermined threshold value, if the result is negative, then the rotated template image, up until the maximum degree of matching the template image and the CT image. 如果匹配程度大于某个预先设定的阈值,则认为CT图中存在分格筒,否则认为CT图中不存在分格筒。 If the matching degree is greater than a predetermined threshold value, divided barrel is considered present in the CT image, or that the absence of CT divided barrel in FIG.

[0219] 如果CT图中存在分格筒,可以在步骤S812进一步根据定位标记的特点来检测定位标记。 [0219] If present in the CT image divided barrel, step S812 may further detect the positioning mark according to the characteristics of the positioning mark. 仍以带十字分格的第一种筒为例,其定位标记位于一条分格线的顶端,使这条分格线较其他三条分格线短。 The first tube is still ruled with a cross for example, positioned at the top of a mark ruled line, ruled lines make this shorter than the other three ruled lines. 使用模板匹配法确认CT图中存在分格筒后,匹配程度最大时模板图像中的十字线正好与分格线重合;通过比较四条分格线的长度,提取其中的最长的一条,即可得到定位标记。 After confirming the presence of CT in FIG divided barrel template matching method is used, the maximum degree of matching template image and the reticle coincides exactly ruled line; comparing the length of four ruled lines, wherein the extracted longest, can get registration mark.

[0220] 在多层CT成像后,首先对每一层CT图像进行分格筒检测和定位标记检测。 [0220] In the multi-slice CT imaging, each layer of the first CT image is divided barrel positioning mark detection and detection. 如果各层CT图像中都没有检测到分格筒,则认为操作员没有使用分格筒;如果在至少一层CT图像中检测到分格筒,则认为操作员使用了分格筒;如果各层检测到的定位标记位置不一,可以其中信号强度最大的一个作为最终的定位标记。 If the CT image layers are divided barrel is not detected, the operator does not use that divided barrel; if the detected at least one divided barrel CT image, it is presumed that the operator uses the divided barrel; if each layer detects different positions of the positioning markers, which can be a maximum signal strength as the final positioning marks. 描述某一层CT中定位标记信号强度的一个方法是:用该层四条分割线长度的最大值减去平均值,其差值越大,定位标记信号越强。 Describes a method of positioning a layer CT flag signal strength is: the maximum value by subtracting the average layer length of the four dividing lines, the greater the difference, the stronger the positioning mark signal.

[0221] 图24A-24D示出了在检测过程中旋转桶的示意图。 [0221] FIGS. 24A-24D shows a schematic view of the rotary tub during detection. 只需将分格检测筒的定位标记调整到预定位置,即可将各分格调整到指定位置。 Simply ruled positioning mark detection cylinder is adjusted to a predetermined position, each of the bins can be adjusted to the specified location. 以第一种十字分格筒为例,以CT图像中心为坐标系原点建立极坐标系,各分格的位置由定位标记的角度坐标唯一确定。 In a first cross-ruled barrel, for example, to a CT image center coordinate origin establishing a polar coordinate system, a position of each ruled by the positioning mark of angular coordinate uniquely determined. 假设系统在各种CT图像中最终确定的定位标记所对应的极坐标角度为Y,而系统预先设定的调整目标是Θ,那么只需将各层CT图像以及承载机构旋转角度θ-gamma即可完成调整,如下图24所示。 Polar angular positioning mark assuming the system finally determined in a variety of CT image corresponding to Y, and the adjustment of the target system is pre-set Θ, then the layers were simply means the CT image and the angle of rotation θ-gamma carrying i.e. adjustment may be accomplished, as shown in FIG. 24.

[0222] 如图24Α和24Β所示,将分格桶旋转一个角度,以达到预先要求的位置。 [0222] As shown in FIG 24Α 24Β and the divided barrel rotation angle to reach a predetermined position required. 同样,对每层CT成像所得到的图像进行旋转,使其与旋转后的分格桶的角度一致。 Similarly, each of the image obtained by CT imaging is rotated to match the divided barrel after rotation angle adjustment.

[0223] 图25示出了根据本实施方式的检查过程的流程图。 [0223] FIG. 25 shows a flowchart of the inspection process of the present embodiment. 由于从步骤S910到步骤S921与上述第三实施方式的步骤S710到步骤S721相同,这里仅仅描述步骤S922到步骤S926.[0224] 在步骤S922,分析CT图像,在步骤S923判断中是否带有分格检测筒。 Is the same as from step S910 to step S921 of the third embodiment step S710 to step S721 of the embodiment, only the description of step S922 to step S926. [0224] Here in step S922, analyzes the CT image, it is determined at step S923 whether the points with cell detection cartridge. 如果没有检测筒,则本次检查结束。 If no tube is detected, then the end of this inspection.

[0225] 如果使用了检测桶,则在步骤S924识别检测筒的定位标记,确定每个分格的位置。 [0225] If the tub is detected, then in step S924 recognizes the detection cartridge positioning mark, determining the position of each sub-grid. 然后在步骤S925对承载机构角度和各层CT图像角度进行第二次调整,将承载机构上检测筒中每个分格的位置,以及液体各层CT图像上每个分格的位置,都调整到预定的位置上。 Then at step S925 and the angle of the layers of the support means a second CT image angle adjustment, the carrier on the cylinder means detecting the position of each of the bins, and a position on the liquid layers of each sub-grid of the CT image, are adjusted to predetermined position.

[0226] 在步骤S926,系统列出每层CT图像中落在每个分格部分内的各液体区域的检查结果,汇总成每个分格的检查结论并提示给用户。 [0226] In step S926, the system lists each CT image falls on the inspection result of each liquid regions within each sub-grid section, each aggregated into divisions and inspection results to the user. 根据本实施方式的一种汇总方法是:对于某个分格,仅当所有CT图像中落在该分格内所有液体区域都被判为安全液体时,本格的检查结论为“安全”;否则本格的检查结论即为“可疑”。 Summary In accordance with one method of the present embodiment is: for a sub-frame, only when all of the CT image falls within the region of all of the liquid are judged to be safe ruled liquid, the inspection results of the present grid is "safe"; otherwise, inspection findings of this grid is "suspicious."

[0227]【第四实施方式】 [0227] [Fourth Embodiment

[0228]以上的第一到第三实施方式描述了本发明的检查方法用来判断被检液态物品是否是可疑物品,但是也可以直接判断被检液态物品是否隐藏了毒品。 [0228] The above described first to third embodiments of the present invention is a method of checking to determine whether the inspected liquid article is suspicious objects, but may be directly determined whether the subject drugs concealed in liquid article.

[0229] 液体的物理属性(比如密度和等效原子序数),在藏毒后将发生改变。 [0229] Physical properties of the liquid (such equivalent atomic number and density), changed after possession. 比如,纯净水的密度为1.0Og/cm3,原子序数为7.5。 For example, the density of pure water 1.0Og / cm3, atomic number is 7.5.

[0230] 当1000g水中溶解有50g可卡因时,其密度变为l.0lg/cm3,原子序数为7.6。 [0230] When dissolved in water 1000g 50g cocaine, which density becomes l.0lg / cm3, an atomic number of 7.6.

[0231] 计算物质(包括混合物)等效原子序数的方法如下: [0231] Calculation substances (including mixtures) equivalent atomic number as follows:

[0232] 假设某种物质共含有N种元素,各种元素的原子序数分别SZi,原子个数百分比为Cii,其中i = 1,2,...,N,且;,那么该物质的等效原子序数为: [0232] Suppose a substance containing a total of N elements, various elements are SZi atomic number, the percentage of the number of atoms, Cii, where i = 1,2, ..., N, and; then the other substance efficiency atomic number:

/ 二I / II I

[0233] Zeff=^aiZ:5 I^aiZiT [0233] Zeff = ^ aiZ: 5 I ^ aiZiT

/ 二I / 二I / II I / II I

[0234] 这样,以水(H2O)为例,其等效原子序数的计算过程如下表1所示: [0234] Thus, water (H2O) as an example, the calculation procedure is the equivalent atomic number as shown in Table 1:

Figure CN102565102BD00211

[0236] 液体藏毒后密度、原子序数的变化(以水中溶解盐酸可卡因为例)如下表2所示: [0236] After the liquid density possession, the change in atomic number (in order of cocaine hydrochloride was dissolved in water, for example) as shown in Table 2:

[0237] [0237]

Figure CN102565102BD00212

[0238] 另外,图26A是说明液体在隐藏了毒品之后密度的变化曲线。 [0238] Further, FIG. 26A is a density curve of liquid drugs concealed in the following. 图26B是说明液体在隐藏了毒品之后原子序数的变化曲线。 FIG 26B is a curve drugs concealed in the liquid after the atomic number. 图26C是说明液体在隐藏了毒品之后特征密度的变化曲线。 FIG 26C is a diagram illustrating a liquid drugs concealed after density characteristics curve.

[0239] 下面对照附图27详细说明本发明实施方式的检查方法。 Check method of embodiment 27 of the present invention described in detail [0239] below with reference to the accompanying drawings.

[0240] 在步骤S1010,操作员将被检液态物品放在承载机构40上,并且根据乘客的报关单或者液态物品上的标签获取该液态物品的标识信息,例如一瓶水。 [0240] In step S1010, the operator on the inspected liquid article support means 40, and acquires identification information of the liquid articles according to the declaration on the label or liquids passengers, for example, a bottle of water.

[0241] 然后,在步骤S1011,操作员根据该标识信息从数据库中搜索获取其参考密度和参考原子序数,例如密度为1.00 (特征密度1.ll)g/cm3,参考原子序数为7.51。 [0241] Then, at step S1011,, the operator searches the identification information acquired from the database based on the reference density and reference its atomic number, for example, a density of 1.00 (density of features 1.ll) g / cm3, with reference to an atomic number of 7.51. 接下来,操作员按下启动按钮开始执行DR扫描,以生成DR图像。 Next, the operator presses the start button begin DR scan to generate a DR image.

[0242] 在获得DR图像后,在步骤S1013A,对DR图像进行分析,自动确定CT成像的扫描位置,或者在步骤S1013B,由操作员操作诸如鼠标之类的输入装置65来指定要进行CT扫描的位置。 [0242] After obtaining the DR image, at step S1013A, the DR image is analyzed to automatically determine a scanning position of CT imaging, or step S1013B, operated by an operator input device such as a mouse 65 to specify a CT scan s position. 这样,由于仅仅对液态物品中有代表性的位置进行CT扫描,从而加快了检查速度,而不会降低检查质量。 Thus, since only the position of the liquid articles typical CT scan, thereby speeding up the inspection speed without degrading the quality inspection.

[0243] 在确定了CT扫描的位置之后,在步骤S1014执行CT扫描过程,也就是针对上述确定的扫描位置对液态物品进行CT扫描,获得CT扫描数据,并且根据重建算重建CT图像。 [0243] After determining the location of the CT scan, CT scan performed in step S1014 the process, i.e. for determining the position of the scanning CT scans of the liquid article to obtain the CT scan data, and the reconstructed CT image reconstruction calculation. 该CT图像的每个像素代表了液态物品中相应部分的密度和原子序数。 Each pixel of the CT image density and atomic number represent corresponding parts in the liquid articles.

[0244] 然后,在步骤S1015,计算机通过执行分析程序来分析CT图像,获取测量的密度和原子序数,例如测得其密度为1.02 (特征密度1.13) g/cm3,原子序数7.71。 [0244] Then, in step S1015, by performing a computer analysis program to analyze a CT image, the measured density and atomic number acquired, obtaining a density of 1.02 as measured for example (characteristic density 1.13) g / cm3, 7.71 atomic number. 进而,在步骤S1016,通过计算可得实测密度与参考值相差0.02g/cm3,原子序数相差0.20。 Further, at step S1016, can be obtained by calculating the measured density and the reference value differ 0.02g / cm3, a difference of 0.20 atomic number. 如果藏毒判别阈值设定为密度差0.01g/cm3,原子序数差0.10,那么测量的密度和原子序数落在了预定的范围之内。 If the possession determination threshold is set to the difference in density 0.01g / cm3, 0.10 atomic number difference, the measurement of density and atomic number falls within a predetermined range. 在步骤S1017,如果差值大于预定的阈值,则表明该液态物品是可疑的,向操作员发出报警,或者打印出检查结果。 In step S1017, if the difference is greater than a predetermined threshold value, it indicates that the liquid article is suspicious, alert the operator, or to print out test results.

[0245] 判别所需的参考密度和原子序数,可以预先测量该类液体的一个样品,并保存到数据库中。 [0245] Referring desired density and atomic number determination, a sample can be measured in advance of such liquid, and saved to the database. 判别所需的差异阈值,可以人工设定为一个合适的值。 Determining a desired difference threshold can be manually set to an appropriate value. 如果希望检测微量的毒品,则可将此阈值设为较小值;其风险在于,即使是不藏毒的被检物,也可能因为系统噪声的原因测得一个较大的偏差值,从而导致误报。 If desired to detect traces of drugs, this threshold is set to be a smaller value; risk that, even if it is not possession of the subject matter, may also be measured a large deviation value because of system noise, resulting in false positives. 反之,如果希望尽可能地减少对于不藏毒液体误报,则应将阈值设为较大值;其风险在于,如果被检液体藏有少量毒品,则其密度差异不足以达到判别阈值,将导致漏报。 Conversely, if you want to minimize the false positives for liquid not possession, the threshold value should be set large; risk that, if the liquid is subject possessing small quantities of drugs, it is not sufficient to reach the density difference detection threshold value, resulting in false negatives.

[0246] 虽然以上以单检物体为例进行了说明,如本领域的普通技术人员所清楚的那样,第四实施方式的方法同样可以如第二实施方式和第三实施方式那样应用于多瓶检测。 [0246] Although the above objects in a single object has been described as an example, as those of ordinary skill in the clear to the method of the fourth embodiment may also be used, such as the second embodiment and the third embodiment of the bottles detection.

[0247]【变型I】 [0247] [I] variant

[0248] 虽然以上以先进行DR成像然后进行CT成像为例对本发明的实施例进行了说明,但是也可以直接进行螺旋CT成像来对液态物品进行检查。 [0248] While the above first to the DR image and then the CT imaging of an example embodiment of the present invention has been described, but may also be directly spiral CT imaging of the liquid articles to be checked.

[0249] 对液态物品进行螺旋CT检查所得到的是一组螺旋CT图像,通过比较和分析该组CT图像中的像素,就可以确定液态物品中液体的位置,以及液体是否分层,然后利用与如上描述的类似的方法获得各层位置的液体的物理属性值,例如密度和原子序数。 [0249] The liquid article spiral CT examination is obtained a set of helical CT images, the CT images of the set of pixel comparison and analysis, it is possible to determine the position of the liquid in the liquid article, and whether the liquid is layered, then use physical attributes similar manner as described above to obtain the position of each layer of the liquid, such as density and atomic number. 例如在对如图28所示的液态物品进行螺旋CT成像时,如果以2cm为螺旋节距来进行扫描,将会得到如图29A-29M所示的一组CT图像。 For example, when the liquid article 28 shown in FIG spiral CT imaging, if the helical pitch is 2cm to scan, will be a set of CT images shown in FIG. 29A-29M. 这样,通过分析各个螺旋CT图像中的像素值,就可以得知液态物品中液体的位置。 Thus, by analyzing the pixel value of each spiral CT image, it is possible to know the position of the liquid in the liquid article. 这里的螺旋CT成像可以采用大螺距CT成像或者常规螺距CT成像。 Here spiral CT CT imaging may be employed a large pitch or normal pitch CT imaging.

[0250] 另外,虽然上面以密度和原子序数为例进行了说明,但是本发明同样可以仅仅使用密度或者原子序数之一来进行,或者使用其他更多的物理属性来进行。 [0250] Further, while the above atomic number and density described as an example, but the present invention is equally possible to use only one of the density or atomic number to, or use other more physical attributes to.

[0251]【变型2】 [0251] [Modification 2]

[0252] 虽然以上以先进行DR成像,然后进行双能CT成像来获取液体的密度和原子序数,但是这里的DR成像并不是必须的,因为可以针对不同的液态物品来事先指定预定的位置进行双能CT成像,来获得液体的密度和原子序数。 [0252] While the above first to the DR image, and then to acquire dual-energy CT imaging of the liquid density and atomic number, but here the DR imaging is not necessary, as may be specified in advance predetermined positions for different items for liquid dual-energy CT imaging, to obtain a liquid density and atomic number.

[0253] 上面的描述仅用于实现本发明的实施方式,本领域的技术人员应该理解,在不脱离本发明的范围的任何修改或局部替换,均应该属于本发明的权利要求来限定的范围,因此,本发明的保护范围应该以权利要求书的保护范围为准。 Range [0253] The above description is only embodiments for realizing the embodiment of the present invention, those skilled in the art will appreciate that any modifications without departing from the scope of the invention or partial replacement, all the claims of the present invention should be defined Therefore, the scope of the present invention, the scope of the claims should prevail.

Claims (32)

1.一种用双能CT对多个液态物品同时进行检查的方法,包括步骤: 将多个液态物品放置在承载机构的上表面相应的区域中,所述承载机构承载所述被检液态物品的表面上被划分成操作人员可识别的多个区域; 对多个被检液态物品进行双能CT扫描,得到双能CT投影数据; 根据所述投影数据进行CT重建,得到表示多个被检液态物品的物理属性值的CT图像; 根据所述CT图像提取多个被检液态物品的物理属性值;以及基于所述物理属性值和该液态物品的参考物理属性值来判断所述多个被检液态物品至少之一是否是可疑的; 其中,从双能投影数据重建表示被检液态物品的物理属性值的CT图像的步骤包括: 根据高低能投影数据,生成关于两种基材料系数的投影数据; 根据所述两种基材料系数的投影数据进行重建,得到表示被检液态物品所对应的两种基材料系数的CT A method of using a plurality of dual-energy CT inspection while liquid article, comprising the steps of: a plurality of articles placed in the corresponding liquid on the surface region of the carrier means, said carrier means being carrier of the liquid articles the upper surface is divided into a plurality of recognizable operator regions; a plurality of liquid articles dual-energy CT scanning, dual-energy CT projection data; the CT reconstructed from the projection data to obtain a plurality of subject represents CT image of the physical property value of the liquid article; extracting a plurality of physical attributes to be inspected liquid article based on the CT image; and a physical property value based on the reference value of the physical attribute of the liquid articles and to determine the plurality of at least one of whether the inspected liquid article is suspicious; wherein the dual-energy projection data is reconstructed from step represents the subject of the physical attributes of the liquid articles CT images comprising: the low energy projection data to generate projection coefficients on two basic materials transactions; reconstruction from the projection data of the two coefficients based material, to obtain CT represents two basic materials are coefficients corresponding to the inspected liquid article 像;以及根据所述表示基材料系数CT图像,生成所述表示被检液态物品物理属性值的CT图像。 Like; and according to the CT image represents a coefficient based material, generating a CT image showing the physical attributes of the inspected liquid article.
2.如权利要求1所述的方法,其中所述物理属性值包括被检液态物品的密度和原子序数。 2. The method according to claim 1, wherein said physical property value of the liquid article comprises a density and atomic number.
3.如权利要求1所述的方法,其中所述双能CT扫描采用平面断层CT扫描的方式。 The method according to claim 1, wherein the dual-energy CT tomographic plane by way of a CT scan.
4.如权利要求1所述的方法,其中所述双能CT扫描采用常规螺旋CT扫描的方式。 4. The method according to claim 1, wherein the dual-energy CT by way of a conventional spiral CT.
5.如权利要求1所述的方法,其中所述双能CT扫描采用大螺距螺旋CT扫描的方式。 5. The method according to claim 1, wherein the dual-energy CT by way of a large pitch helical CT scan.
6.如权利要求3所述的方法,在进行平面断层CT扫描之前,预先设定一组扫描位置。 6. The method according to claim 3, prior to the tomographic plane CT scan, a group of scanning a predetermined position.
7.如权利要求3所述的方法,在进行平面断层CT扫描之前,先进行DR扫描得到被检液态物品的透射图像,然后根据透射图像确定CT扫描位置。 7. The method according to claim 3, prior to the tomographic plane of the CT scan, the DR first transmission image obtained by scanning the inspected liquid article, and then determining the position of the CT scan in accordance with the transmission image.
8.如权利要求7所述的方法,得到透射图像后,操作员通过输入装置指定透射图像中的至少一行,作为CT扫描位置。 8. The method according to claim 7, to obtain the transmission image, the operator specifies at least one row of the transmission image through the input means, a CT scan position.
9.如权利要求7所述的方法,得到透射图像后,通过图像处理技术自动确定透射图像中的至少一行,作为CT扫描位置。 9. The method according to claim 7, to obtain the transmission image, automatically determining at least one row of the transmission image by image processing techniques, a CT scan position.
10.如权利要求7所述的方法,其中形成透射图像的步骤包括: 从射线源发出高能射线和低能射线,穿透被检液态物品,形成高能透射图像和低能透射图像; 融合高能透射图像和低能透射图像,形成所述透射图像。 10. The method according to claim 7, wherein forming the transmission image comprising: high-energy rays emitted from the radiation source and the low-energy rays penetrating liquid articles, energy transmission image and a low energy transmission image; fusion and high energy transmission image low-energy transmission image, forming the transmission image.
11.如权利要求7所述的方法,其中形成透射图像的步骤包括: 从射线源发出高能射线和低能射线,穿透被检液态物品,形成高能透射图像和低能透射图像; 选择高能透射图像和低能透射图像之一,作为所述透射图像。 11. The method according to claim 7, wherein forming the transmission image comprising: high-energy rays emitted from the radiation source and the low-energy rays penetrating liquid articles, energy transmission image and a low energy transmission image; selecting a high energy transmission image and one low-energy transmission image as the transmission image.
12.如权利要求1所述的方法,其中根据所述CT图像提取多个被检液态物品的物理属性值的步骤包括: 从所述CT图像中提取与液体部分相对应的像素; 对液体部分的像素计算密度均值和原子序数均值,作为所述被检液态物品的密度和原子序数。 12. The method according to claim 1, wherein the subject extracting a plurality of physical attributes of the liquid articles according to the CT image comprises: extracting pixels corresponding to the liquid portion from the CT image; liquid portion calculating average pixel density and average atomic number, the inspected liquid article as the density and atomic number.
13.如权利要求2所述的方法,其中基于所述物理属性值和该液态物品的参考物理属性值来判断所述被检液态物品是否是可疑的步骤包括: 计算所述密度和原子序数与参考密度和原子序数之间的差值; 在所述差值大于预定的阈值的情况下,认为所述被检液态物品中隐藏了毒品。 13. The method according to claim 2, wherein the physical property value based on the reference value of the physical attribute of the liquid articles and to determine whether the inspected liquid article is questionable step comprises: calculating the density and atomic number and a difference between the reference density and atomic number; in a case where the difference is greater than a predetermined threshold value, that is the subject of drugs concealed in liquid article.
14.如权利要求3所述的方法,其中在针对每个位置进行双能CT扫描之后,旋转被检液态物品的CT图像,使其与第一次双能CT扫描所形成的图像对齐。 After 14. The method according to claim 3, wherein the dual-energy CT for each position, the rotation of the liquid articles CT image, so that the first image formed by dual-energy CT scans are aligned.
15.如权利要求14所述的方法,其中在针对各行进行双能CT扫描之后,旋转被检液态物品,使其与扫描之前的位置相同。 After 15. The method according to claim 14, wherein the dual-energy CT scans for each row, rotating the inspected liquid article, so that the same position before scanning.
16.如权利要求15所述的方法,还包括步骤: 将被检液态物品的判断结果显示在显示屏上。 16. The method of claim 15, further comprising the step of: the liquid articles determination result shown on the display.
17.如权利要求15所述的方法,还包括步骤: 将各个被检液态物品的判断结果打印出来。 17. The method according to claim 15, further comprising the step of: the result of the determination of the respective liquid articles printed.
18.如权利要求15所述的方法,还包括步骤: 将各个被检液态物品的CT图像彩色化。 18. The method according to claim 15, further comprising the step of: CT images of each color of the inspected liquid article.
19.一种用双能CT对多个液态物品同时进行检查的设备,包括: 射线源,用于发出射线; 承载所述被检液态物品的承载机构,所述承载结构承载所述被检液态物品的表面上被划分成操作人员可识别的多个区域,所述多个液态物品放置在承载机构的上表面相应的区域中; 探测和采集装置,用于探测并采集穿透多个被检液态物品的射线信号; 控制器,控制所述射线源和探测和采集装置对多个被检液态物品进行双能CT扫描,得到投影数据; 从投影数据重建表示多个被检液态物品的物理属性值的CT图像的装置;以及基于所述物理属性值和每个液态物品的参考物理属性值来判断所述多个被检液态物品的至少一个是否是可疑的装置; 其中,从双能投影数据重建表示被检液态物品的物理属性值的CT图像的装置包括: 根据高低能投影数据,生成关于两种基材料系数的 19. A plurality of liquid article inspection apparatus simultaneously with the dual-energy CT, comprising: a radiation source for emitting radiation; carrier means for carrying the liquid articles being the subject of the carrier structure carrying the liquid to be subject on the surface of the article is divided into a plurality of recognizable operator regions, said plurality of respective liquid articles placed in the upper surface of the support means in the region; detection and collection means for detecting and acquiring a plurality of penetrating the subject liquid articles ray signal; and a controller, controlling the radiation source and the detection and collection means for a plurality of liquid articles dual-energy CT scan to obtain projection data; represents a plurality of physical attributes to be inspected liquid article is reconstructed from the projection data means the value of the CT image; and a physical property value based on the reference value and each of the physical attribute of the liquid articles by determining whether at least one of said plurality of devices is questionable inspected liquid article; wherein the dual-energy projection data from the CT image reconstruction means indicates physical attributes of the inspected liquid article comprising: the low energy projection data, generated based on two kinds of materials coefficient 影数据的装置; 根据所述两种基材料系数的投影数据进行重建,得到表示被检液态物品所对应的两种基材料系数的CT图像的装置;以及根据所述表示基材料系数CT图像,生成所述表示被检液态物品物理属性值的CT图像的装置。 Image data apparatus; according to the projection data of the two coefficients reconstructed based material, means two CT image based material represents coefficients corresponding to the inspected liquid article obtained; and a base material based on the CT image representation coefficients, generating means the physical attributes of the inspected liquid article represents the CT image.
20.如权利要求19所述的设备,所述双能CT扫描是基于预定的位置进行的。 20. The apparatus according to claim 19, the dual-energy CT is performed based on a predetermined position.
21.如权利要求19所述的设备,其中所述探测和采集装置探测并采集穿透至少一件被检液态物品的射线信号以形成透射图像; 其中所述设备还包括指定透射图像中的至少一行的装置; 所述双能CT扫描是基于所指定的行而进行的。 21. The apparatus according to claim 19, wherein the detection and collection means and the detection signal of at least one penetrating radiation collecting liquid articles to form a transmission image; wherein said apparatus further comprises at least a transmission image designated means line; the dual-energy CT scanning is performed on the specified row carried out.
22.如权利要求19所述的设备,其中所述物理属性值至少包括被检液态物品的密度和原子序数。 22. The apparatus according to claim 19, wherein said physical property includes at least the value of the inspected liquid article density and atomic number.
23.如权利要求21所述的设备,其中从射线源发出高能射线和低能射线,穿透被检液态物品,形成高能透射图像和低能透射图像,所述设备还包括: 融合高能透射图像和低能透射图像形成所述透射图像的装置。 23. The apparatus according to claim 21, wherein the high-energy rays emitted from the radiation source and the low-energy rays penetrating liquid articles, energy transmission image and a low energy transmission image, said apparatus further comprising: a high energy transmission image and low energy Fusion the image transmission apparatus of a transmission image is formed.
24.如权利要求21所述的设备,其中从射线源发出高能射线和低能射线,穿透被检液态物品,形成高能透射图像和低能透射图像,所述设备还包括: 选择高能透射图像和低能透射图像之一,作为所述透射图像的装置。 24. The apparatus according to claim 21, wherein the high energy radiation emitted from the radiation source and the low-energy radiation, penetrating liquid articles, energy transmission image and a low energy transmission image, said apparatus further comprising: selecting a low energy and a high energy transmission image transmitting one of the image, the apparatus as a transmission image.
25.如权利要求21所述的设备,所述指定透射图像中的至少一行的装置包括: 操作员利用输入装置从透射图像中选择至少一行的装置。 25. The apparatus according to claim 21, the image transmission apparatus comprises at least one row in the designated: means selecting at least one row of the transmission image from the operator input device.
26.如权利要求21所述的设备,其中所述指定透射图像中的至少一行的装置包括: 分析所述透射图像的像素值,以将所述透射图像分层的装置; 将各层中的中间行指定为要进行双能CT扫描的行的装置。 26. The apparatus according to claim 21, wherein said designating means is at least one row in the transmission image comprises: analyzing the pixel value of the transmission image to an image of the hierarchical transmission; the layers of the middle row by row to be designated as a dual-energy CT scan.
27.如权利要求22所述的设备,其中基于所述物理属性值和该液态物品的参考物理属性值来判断所述被检液态物品是否是可疑的装置包括: 计算所述密度和原子序数与参考密度和原子序数之间的差值的装置; 在所述差值大于预定的阈值的情况下,认为所述被检液态物品中隐藏了毒品。 27. The apparatus according to claim 22, wherein the physical property value based on the reference value of the physical attribute of the liquid articles and to determine whether the inspected liquid article is questionable apparatus comprising: calculating the density and atomic number and It means the difference between the reference density and atomic number; in a case where the difference is greater than a predetermined threshold value, that is the subject of drugs concealed in liquid article.
28.如权利要求21所述的设备,还包括:在针对每行进行双能CT扫描之后,旋转被检液态物品的CT图像,使其与第一次双能CT扫描所形成的图像对齐的装置。 28. The apparatus according to claim 21, further comprising: after the dual-energy CT scans for each row, the CT image of the subject rotating liquid article, so that the first image formed by dual-energy CT scan alignment device.
29.如权利要求21所述的设备,还包括在针对各行进行双能CT扫描之后,旋转被检液态物品,使其与扫描之前的位置相同的装置。 29. The apparatus of claim 21 reacted with the same position prior to the scanning device, further comprising, after the dual-energy CT scans for each row, rotating the liquid article.
30.如权利要求29所述的设备,还包括: 显示装置,显示被检液态物品的判断结果。 30. The apparatus as claimed in claim 29, further comprising: display means for displaying the determination result of the inspected liquid article.
31.如权利要求29所述的设备,还包括: 将各个被检液态物品的判断结果打印出来的装置。 31. The apparatus as claimed in claim 29, further comprising: means for respective liquid articles determination result printed.
32.如权利要求29所述的设备,还包括: 将各个被检液态物品的CT图像彩色化的装置。 32. The apparatus as claimed in claim 29, further comprising: respective liquid articles CT images of a color device.
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