Human body safety check device and method for operating the same and filter device

Abstract

A security checking device (100) for the human body, comprising: a radiation source (10) having a radiation beam output (11) adapted to emit a radiation beam; and a beam guiding housing (20) designed to guide the radiation beam emitted by the radiation source (10); wherein the human body security checking device (100) further comprises: a filter device (30) arranged between the radiation beam output of the radiation source (10) and the beam guide housing (20), wherein the filter device (30) comprises: an enclosure (31); and a filter cage (32) arranged in the enclosure (31) and formed by arranging two or more pairs of filter layers (321) made of different materials and / or having different thicknesses in a surrounding manner; wherein the filter cage (32) is rotatable about its central axis so that at least one pair of the two or more pairs of filter layers (321) is capable of filtering the radiation beam from the radiation beam output of the radiation source (10) in order to adjust a delivered dosage of the radiation beam of the human body security screening device (100); wherein the human body security checking device (100) further comprises: a pair of filter region defining rods (33), the pair of filter region defining rods (33) being arranged at respective opposite ends of the filter cage (32) along a central axis of the filter cage (32) and being adapted to be movable in a direction in which the central axis of the filter cage (32) extends to define a filter region, between the pair of filter region defining rods (33), of the at least one pair of the two or more pairs of filter layers (321), to define a scanning region of the radiation beam.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of Chinese Patent Application No. 201710133118.5, filed on March 7, 2017, with the State Intellectual Property Office of the People's Republic of China, the entire disclosure of which is incorporated herein by reference. Technical area

[0002] Embodiments of the present disclosure primarily relate to the field of human body safety screening using an X-ray source, and more particularly to a filter device, a human body safety screening device comprising the filter device, and a human body safety screening method. Furthermore, the present disclosure can also be used in the field of human medical radiotherapy. Description of related technology

[0003] Currently, techniques for conducting human body security screening using an X-ray machine are mainly divided into two types based on different principles: transmission imaging technology and backscatter imaging technology. Transmission X-ray imaging technology refers to the application of X-rays to penetrate a human body to be inspected and the analysis of the X-ray signal penetrating the human body to obtain a transmission image of the human body. Transmission X-ray imaging technology is the main technical approach for checking for hidden objects in the human body and on the body surface.Backscatter X-ray technology uses a micro-X-ray source to scan a person under inspection and receive a radiation signal backscattered from the human body surface to obtain a contour image of the human body surface and an object. Backscatter X-ray technology is effective for detecting hazardous materials carried by the human body.

[0004] In fact, when exposed to X-rays, the human body is subjected to ionizing radiation. Therefore, there are strict dosage limits for various radiation protection systems. In order to reduce unnecessary radiation damage to the human body and at the same time achieve the purpose of human body safety screening, existing human body X-ray screening equipment generally has multiple dosage output levels, and the adjustment between different dosage output levels is achieved by adjusting the voltage and current parameters of the X-ray machine. When conducting a common or general safety screening, a person or crowd is screened with a low- or micro-dose radiation beam. In unconventional cases, such asWhen checking suspicious objects or important locations, or at critical times, security screening is performed using high-dose radiation to obtain a sharper image, thereby achieving more reliable detection and faster screening. However, in practice, the difference between high and low doses of emitted radiation is limited. In addition, while conducting a human body screening, existing X-ray security screening devices generally only perform an overall scan of the whole human body or only a partial scan of a specific area of ​​the body or a specific location on the human body, but are not flexible enough to perform scanning and security screening of any part of the human body.Furthermore, it is impossible for existing X-ray safety screening equipment for the human body to protect the remaining area of ​​the human body that is not being scanned from radiation in order to reduce radiation damage when performing local scanning of the human body.

[0005] US 4 399 550 A discloses a safety checking device for the human body, comprising: a radiation source having a radiation beam output, adapted to emit a radiation beam; and a beam guiding housing designed to guide the radiation beam emitted by the radiation source; wherein the human body safety checking device further comprises: a filter device arranged between the radiation beam output of the radiation source and the beam guide housing, wherein the filter device comprises: an enclosure; and a filter cage disposed within the enclosure and formed by arranging two or more pairs of filter layers made of different materials and / or having different thicknesses in a surrounding manner; wherein the filter cage is rotatable about its central axis such that at least one pair of the two or more pairs of filter layers is capable of filtering the radiation beam from the radiation beam output of the radiation source to adjust a delivered dosage of the radiation beam of the human body security screening device.

[0006] However, the purposes and objectives of safety screening are different, and the attention and requirements for safety screening of different areas of the human body are also different. Therefore, in practice, one of the main topics and goals of the industry today is to achieve a human body safety screening device that can adjust the scanning area and achieve an appropriate delivered dosage in time when needed, thus conducting a safety screening of any area of ​​the human body while avoiding unnecessary radiation damage. Brief description

[0007] According to one aspect of the present disclosure, a human body security screening device is provided, comprising: a radiation source having a radiation beam output configured to emit a radiation beam; and a beam guiding housing for guiding the radiation beam emitted by the radiation source; wherein the human body security screening device further comprises: a filter device disposed between the radiation beam output of the radiation source and the beam guiding housing, the filter device comprising: an enclosure; and a filter cage disposed within the enclosure and formed by the arrangement of two or more pairs of filter layers made of different materials and / or having different thicknesses; wherein the filter cage is capable of rotating about its central axis such that at least one pair of the two or more pairs of filter layers is capable of filtering the radiation beam from the radiation beam output of the radiation source to adjust a delivered dosage of the radiation beam of the human body security screening device.

[0008] The human body security screening device may further comprise a pair of filter area-defining rods, wherein the pair of filter area-defining rods are arranged at respective opposite ends of the filter cage along the central axis and are configured to be movable in a direction in which the central axis of the filter cage extends to define a filter area—between the pair of filter area-defining rods—of the at least one pair of the two or more pairs of filter layers, thereby defining a scanning area of ​​the radiation beam. Here, the movement of the pair of filter area-defining rods may be driven by a stepper motor.

[0009] In some embodiments, the material and diameter of the pair of rods defining the filter area are designed to be sufficient to shield and block the radiation beam emitted by the radiation source.

[0010] In some embodiments, the human body security screening device may further comprise: an input unit configured to send a command to move the pair of filter area defining rods for the filter area by setting a rod identifier representative of the pair of filter area defining rods; and a control unit configured to control the movement of the pair of filter area defining rods for the filter area based on the command from the input unit.In some further embodiments, the input unit may be further configured to set the bar identifiers representative of the pair of filter area defining bars on a whole human body optical photogram or a whole human body security screening scan map, thereby defining any scanned area of ​​a human body to be screened by moving the bar identifiers.

[0011] In some embodiments, materials and / or thicknesses of the two or more pairs of filter layers in the filter cage are determined based on different radiation filtering requirements for the radiation beam.

[0012] In some embodiments, in the filter cage, at least one of the two or more pairs of filter layers comprises a pair of filter layers arranged around the central axis of the filter cage so as to oppose each other. Specifically, for example, two or more pairs of filter layers may comprise three pairs of filter layers, each of which comprises filter layers arranged around the central axis of the filter cage so as to oppose each other.

[0013] In some embodiments, the filter cage is implemented in a squirrel cage with a gap between two adjacent filter layers.

[0014] In some embodiments, rotation of the filter cage is driven by a motor. For example, the rotation of the filter cage may be driven by a stepper motor.

[0015] Preferably, the above-mentioned human body security inspection device is a transmission imaging security inspection device or a backscatter imaging security inspection device.

[0016] According to another aspect of the present disclosure, there is provided a method of operating the above-mentioned human body security checking device, the method comprising: Performing a scan of the human body to be examined in a first scanning mode, wherein the first scanning mode refers to a mode in which the two or more pairs of filter layers are rotated to set a delivered dosage of a radiation beam to a high dosage for scanning, and in the first scanning mode, each region of the human body to be scanned is defined by setting the rod identifier representative of the pair of filter region defining rods.

[0017] The method may further comprise: performing a scan of the human body using a second scanning mode, wherein the second scanning mode refers to a mode in which the two or more filter layers are rotated to adjust a delivered dosage of the radiation beam to a low dosage for scanning, and in the second scanning mode, a scan of the whole human body is performed.

[0018] According to yet another aspect of the present disclosure, there is provided a filter device for a human body security screening device, the filter device comprising: an enclosure and a filter cage, wherein the filter cage is disposed within the enclosure and is formed by arranging two or more pairs of filter layers made of different materials and / or having different thicknesses; wherein the filter cage is capable of rotating about its central axis such that at least one pair of the two or more pairs of filter layers is capable of filtering the radiation beam from a radiation beam output of a radiation source of the human body security screening device to adjust a delivered dosage of the radiation beam of the human body security screening device.

[0019] The filter device may further comprise a pair of filter area defining rods, wherein the material and diameter of the pair of filter area defining rods are designed to be sufficient to shield and block the radiation beam emitted by the radiation source and are arranged at respective opposite ends of the filter cage along the central axis, and wherein the pair of filter area defining rods is designed to be able to move in the direction of the central axis of the filter cage.

[0020] In some embodiments, materials and / or thicknesses of the two or more pairs of filter layers are determined based on different radiation filtering requirements for the radiation beam.

[0021] In some embodiments, at least one of the two or more pairs of filter layers comprises a pair of filter layers arranged around a central axis of the filter cage so as to oppose each other. Specifically, the two or more pairs of filter layers comprise, for example, three pairs of filter layers, and each pair of filter layers is arranged around the central axis of the filter cage so as to oppose each other.

[0022] In some embodiments, the filter cage is designed as a squirrel cage with a gap between two adjacent filter layers.

[0023] In some embodiments, the rotation of the filter cage is driven by a motor. For example, the rotation of the filter cage can be driven by a stepper motor.

[0024] Here, the movement of the pair of rods defining the filter area can be driven, for example, by a stepper motor.

[0025] Other inventive objects that can be achieved by the present disclosure, as well as other technical effects that can be achieved, are explained in the following detailed description in conjunction with the description of the specific embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To make the objects, technical solutions, and advantages of the present disclosure more understandable, the present disclosure will be described in more detail with reference to the accompanying drawings, in which: Fig. 1 is a schematic structural view of a human body security check device according to an embodiment of the present disclosure; Fig. 2 is a schematic cross-sectional structural view of a human body security check device according to an embodiment of the present disclosure; Fig. 3 is a schematic diagram of selecting an arbitrary region of the human body for high-dose scanning from a low-dose whole-human-body security screening image using a method of operating a human body security screening device according to an embodiment of the present disclosure; Fig. 4 is a schematic diagram for selecting an arbitrary area of ​​the human body for high-dose scanning from a whole-body optical photogram using a method of operating a human body security screening device according to an embodiment of the present disclosure; and Fig. 5 shows a human body security check scan map obtained by performing a high-dose scan on any area of ​​the human body for high-dose scanning using a method of operating a human body security check apparatus according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] The technical solutions of the present disclosure will be further described in more detail using embodiments and with reference to the accompanying drawings. Throughout the description, the same or similar reference numerals designate the same or similar parts. The description of the embodiments of the present disclosure is intended to illustrate the present invention and is not to be construed as limiting.

[0028] According to a general inventive concept of the present disclosure, a human body security screening device is provided, comprising: a radiation source having a radiation beam output configured to emit a radiation beam; and a beam guiding housing for guiding the radiation beam emitted by the radiation source. The human body security screening device also includes a filter device disposed between the radiation beam output of the radiation source and the beam guiding housing. The filter device includes: an enclosure and a filter cage.The filter cage is arranged in the enclosure and is formed by arranging two or more pairs of filter layers made of different materials and / or with different thicknesses in a surrounding manner; wherein the filter cage is rotatable along its central axis so that at least one pair of the two or more pairs of filter layers can filter the radiation beam from the radiation beam output of the radiation source in order to adjust a dosage of the radiation beam emitted by the human body security screening device.A method of operating the aforementioned human body security screening device is also provided, the method comprising: performing a scan of a human body to be scanned using a first scanning mode, wherein the first scanning mode refers to a mode in which two or more pairs of filter layers are rotated to adjust the dosage of the emitted radiation beam to a low dosage for scanning, and a full-body scan of the human body is performed in the first scanning mode. Furthermore, a filter device is provided, comprising: an enclosure and a filter cage.The filter cage is arranged in the enclosure and is formed from two or more pairs of filter layers made of different materials and / or with different thicknesses in a surrounding manner; wherein the filter cage is rotatable about its central axis so that at least one pair of the two or more pairs of filter layers can filter a radiation beam from a radiation beam output of a radiation source in order to adjust a dosage of the radiation beam emitted by the human body security screening device.

[0029] In the following detailed description, numerous specific details are clearly set forth, however, one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown schematically in the drawings.

[0030] With reference to Fig. 1 and Fig. 2, the present disclosure illustrates a human body security screening device 100, which generally includes a radiation source 10, a beam guiding housing 20, and a filter device 30 disposed between a radiation beam output 11 of the radiation source 10 and the beam guiding housing 20. Furthermore, the human body security screening device further includes essential components such as a collimator, a detector, and may also include peripheral components such as a radiation shielding plate, which are not described herein because they are not related to the main points of the disclosure. Technical contents of existing human body security screening devices in previous patent documents / patent application documents or from the industry may be referred to as needed.According to the present disclosure, the radiation source 10 may include an x-ray source, a gamma-ray source, a neutron source, or the like. In the illustrated embodiment, the human body security screening device is an x-ray security screening device. At this time, the radiation source 10 is an x-ray machine or an x-ray accelerator that generates x-rays to generate x-ray radiation. The beam guide housing 20 serves to suppress and absorb scattered rays on a collimator and / or a splitter to reduce the radiation exposure of an enclosure of the device. In the illustrated embodiment, the beam guide housing 20 has the shape of a fan or a triangular configuration.According to the present disclosure, the filter device 30 is used to filter the radiation beam (not shown) from the radiation beam output 11 of the radiation source 10 to adjust the dosage of the radiation beam emitted by the human body security screening device 100. In the illustrated embodiment, the radiation source 10 and its radiation beam output 11, the filter device 30, and the beam delivery housing 20 (and the detectors and collimators not mentioned here) are arranged or contained within a same plane to achieve the emission of an X-ray beam. Furthermore, the human body security screening device provided by the present disclosure may be a transmission imaging security screening device or a backscatter imaging security screening device.

[0031] According to the present disclosure, as in Fig. 1 and Fig. 2, the filter device 30 mainly comprises a housing 31 and a filter cage 32, wherein the filter cage 32 is arranged in the housing 31 and the filter cage 32 is rotatable about its central axis so that at least one pair of the two or more pairs of filter layers can filter the radiation beam from the radiation beam output of the radiation source in order to adjust a dosage of the radiation beam emitted by the human body security screening device. The filter cage 32 is formed by arranging two or more pairs of filter layers 321 made of different materials and / or with different thicknesses in a surrounding manner, and at least one pair of the two or more pairs of filter layers 321 comprises a pair of filter layers 321 arranged opposite the filter cage 32 with respect to the central axis.For the filter cage 32, the materials and / or thicknesses of the two or more pairs of filter layers 321 are determined based on the radiation filtering properties for different radiation beams. That is, each pair of filter layers 321 is designed and determined based on the filtering for different radiation beams, e.g.A pair of filter layers 321 is selected for filtering the radiation beam from the radiation beam output 11 of the radiation source 10 to obtain a high-dose emitted radiation beam, another pair of filter layers 321 is selected for filtering the radiation beam from the radiation beam output 11 of the radiation source 10 to obtain a low-dose emitted radiation beam, and another pair of filter layers 321 is selected for filtering the radiation beam from the radiation beam output 11 of the radiation source 10 to obtain an extremely low-dose emitted radiation beam, and the like. Furthermore, the filter cage 32 is driven by a motor so that it rotates. For example, the filter cage 32 can be driven by a stepper motor so that it rotates.In this configuration, by rotating the filter cage 32, a specific pair of filter layers 321 within the filter cage 32 is used to filter the radiation beam from the radiation beam output 11 of the radiation source 10 to obtain an emitted radiation beam of the human body safety testing device having a dosage at a required level, such as a high-dose emitted radiation beam or an extremely low-dose emitted radiation beam. In the illustrated embodiment, the filter cage 32 is formed as a squirrel cage with a gap between two adjacent filter layers 321. The two or more pairs of filter layers 321 include three pairs of filter layers 321, each arranged around the central axis of the filter cage 32 so as to face each other.In this way, the human body security inspection device provided by the present disclosure can achieve the output of a radiation beam at different dosages and thus achieve the output of the radiation beam at different dosages under the same X-ray machine parameters and enable a flexible switch between the radiation of a radiation beam with a high dosage and an extremely low dosage in a wide range by providing the above-mentioned rotatable filter cage 32 to use the filter layers 321 made of different materials and / or with different thicknesses for filtering the radiation beam from the radiation beam output 11 of the radiation source 10 to different degrees.

[0032] According to the present disclosure, as in Fig. 1 and Fig. 2, the human body security screening device 100 further includes a pair of filter area defining rods 33 disposed at respective opposite ends of the filter cage 32 in a direction in which the central axis of the filter cage 32 extends, the pair of filter area defining rods 33 being configured to be movable in the direction in which the central axis of the filter cage 32 extends to define a filter area of ​​at least one pair of filter layers 321 of the two or more pairs of filter layers 321 between the pair of filter area defining rods 33.The pair of filter area defining rods 33 is designed to have a material and diameter sufficient to shield and block most of the radiation beam emitted by the radiation source 10, so that only the radiation beam passing through the filter area between the pair of filter area defining rods 33 can radiate onto a human body, thereby achieving safe scanning for any area of ​​a human body.

[0033] Therefore, the human body safety inspection device 100 provided by the present disclosure can conveniently perform a safety inspection for each area of ​​a human body by providing the movable rods defining filter areas.

[0034] In order to perform the human body safety check, the human body safety check device 100 provided by the present disclosure is also provided with a corresponding operating system including various software and hardware for performing human body safety checks, such as a processing program, scanning software, etc., and a processor, a control unit, etc. It should be noted that only the software and units related to the gist of the present disclosure are described herein, and other software and units are not described, and reference may be made to the applicant's previous patent documents or patent applications, or to the technology or technical content of the technology, as needed.

[0035] According to the present disclosure, the human body security screening device 100 further includes an input unit and a control unit. The input unit is configured to transmit a command to move the pair of filter area-defining rods by setting a rod identifier representative of the pair of filter area-defining rods; and the control unit is configured to control the movement of the pair of filter area-defining rods based on the command from the input unit. Additionally, the movement of the pair of filter area-defining rods may be driven, for example, by a stepper motor.

[0036] As in Fig. 3 and Fig. 4, the input unit in the human body security screening device 100 may be configured to store the bar identifiers 330 representative of the pair of bars defining the filter area on a whole human body security screening scan map S ( Fig. 3) or on an optical photogram P of the whole human body ( Fig. 4) to define a scanning area of ​​the human body to be checked by moving the rod identifier 330. Fig. For example, Fig. 3 shows a schematic diagram of the selection of any region of a human body for high-dose scanning from a scan card S of the low-dose whole human body security screening using the human body security screening apparatus provided by the present disclosure; and Fig. Figure 4 shows a schematic diagram of the selection of any region of a human body for high-dose scanning from a low-dose whole-human-body security screening photogram P using the human body security screening device provided by the present disclosure. Accordingly, the control unit is configured to control, based on the command from the input unit, the movement of the pair of filter-area-defining rods to define a filter area between the pair of filter-area-defining rods, thereby defining a scanning area for the radiation beam. Fig. For example, Fig. 5 shows a human body security check scan map obtained by performing high-dose scanning on any portion of a human body selected for high-dose scanning using the human body security check apparatus provided by the present disclosure.

[0037] It can be seen that according to the human body security screening device provided by the present disclosure, a physical location of the pair of filter area defining rods is assigned to the scanning software of the device, so that when performing the human body security screening, a whole body scan with an ultra-microdosage or an optical imaging of a specific location is performed in advance on a person to be screened, and the whole body security screening scanning map or the obtained whole body optical photogram is displayed in the software interface to click and drag the rod identifiers representative of the filter area defining rods on the software interface to set an actual physical position of the filter area defining rods, which is electrically driven,Then, a scan check can be performed on the person. That is, a precise and local scan can be performed on any area or position of the human body of a suspect. In this way, a scan security check can be flexibly performed on any area of ​​the human body.

[0038] Accordingly, the present disclosure further provides a method of operating the aforementioned human body security screening device. The method includes: performing a scan of a human body to be scanned in a first scan mode, wherein the first scan mode refers to a mode in which the two or more pairs of filter layers are rotated to adjust a delivered dosage of a radiation beam to a high dosage for scanning, and in the first scan mode, each region of the human body to be scanned is defined by adjusting the bar identifiers representative of the pair of filter region-defining bars.The method further comprises: performing a scan of the human body in a second scan mode, wherein the second scan mode refers to a mode in which the two or more pairs of filter layers are rotated to adjust a delivered dosage of a radiation beam to a low dosage for scanning, and in the second scan mode the whole human body is scanned.

[0039] Therefore, the human body safety check device and the method of operating the same provided by the present disclosure may employ the following software design flow. a). When the human body is ready to enter a scanning cycle, a dosage level of the radiation beam delivered for the security clearance scan is first determined based on the relevant information. b). Based on the determined dosage level of the delivered radiation beam, a stepper motor is started, which controls the filter device, whereby the filter cage is rotated to select a corresponding pair of filter layers for filtering, so that the radiation beam coming from the radiation source, penetrating the pair of filter layers, is filtered to a desired dosage level for output. c). A standard whole-body safety scan is performed at the desired dosage for the human body. d). After selecting the appropriate filter, when it is necessary to perform a security check on a local area of ​​the human body, or when a specific local area of ​​the human body needs to be re-scanned or scanned with a higher dosage because the inspection on the local area has uncertainties or the image is not clear after a usual whole-body inspection of the human body, the rod identifiers representative of the filter area defining rods can be clicked and dragged on the software interface to move the filter area defining rods to define a specific location for scanning, thereby performing a local security check scan of any area of ​​the human body. e). If a security screening scan needs to be performed at a precise location of the specific segment of the human body, then after selecting the appropriate filter layers, the rod identifiers representative of the filter area defining rods can be clicked and dragged on the software interface, referring to the usual low-dose whole-human-body security screening scan map or a specific location of the whole-human-body optical photogram, to move the filter area defining rods to define a local scanning area, thereby performing a precise local security screening scan of any segment of the human body.

[0040] It can be seen that according to the human body security screening device and the method of operating the same provided by the present disclosure, due to the configuration of the filter device at the junction between the radiation source and the beam guide housing, the radiation beam can be selectively passed through the filter layers having different filtering properties, so that the human body security screening device can output a radiation beam at a dosage in a wide range, thereby meeting the security screening requirements in different situations, locations, times, and populations.Furthermore, according to the human body security inspection device and the method of operating the same provided by the present disclosure, due to the provision of the movable filter area defining rods at both ends of the filter cage and due to the movement and adjustment of the physical positions of the filter area defining rods, the security inspection scanning can be performed for any portion of the inspected human body.Furthermore, according to the human body security check device and the method of operating the same provided by the present disclosure, the physical positions of the pair of filter area defining rods are assigned to the scanning software of the device, so that the rod identifiers representative of the filter area defining rods are displayed on the software interface, and the adjustment of the actual physical positions of the pair of filter area defining rods is enabled by clicking and dragging the rod identifiers on the software interface to define a local scanning area, thereby achieving flexible, fast, and convenient adjustment of the security check for each area of ​​the human body.In addition, the above-mentioned movement of the filter area defining rods can be achieved by dragging the rod identifiers to the specific position of the optical photogram or the usual scanning map of the low-dose security check (the image is displayed on the software interface), thereby defining the actual physical position of the filter area defining rods and performing the local precise scanning check of any part of the human body.

[0041] Furthermore, the present disclosure also provides a filter device for a human body security screening device. As in Fig. 1 and Fig.2, the filter device 30 comprises: a housing 31 and a filter cage 32 arranged in the housing 31 and formed by arranging two or more pairs of filter layers 321 made of different materials and / or having different thicknesses in a surrounding manner; wherein the filter cage 32 is rotatable along its central axis so that at least one pair of the two or more pairs of filter layers 321 can filter a radiation beam from a radiation beam output of a radiation source of the human body security screening device to adjust a delivered dosage of the radiation beam of the human body security screening device. The materials and / or thicknesses of the two or more pairs of filter layers 321 are determined based on the different radiation filtering requirements for the radiation beam.At least one of the two or more pairs of filter layers 321 includes a pair of filter layers 321 arranged around the central axis of the filter cage 32 so as to face each other. For example, two or more pairs of filter layers 321 may include three pairs of filter layers 321, each pair of filter layers 321 arranged around the central axis of the filter cage 32 so as to face each other. The filter cage 32 is formed in a squirrel cage shape with a gap between two adjacent filter layers 321. The rotation of the filter cage 32 is driven by a motor. For example, the rotation of the filter cage may be driven by a stepper motor.The filter device 30 may further comprise a pair of filter region-defining rods 33 configured to have a material and diameter sufficient to shield and block the radiation beam emitted by the radiation source. The pair of filter region-defining rods 33 are arranged separately at opposite ends along the central axis of the filter cage, and the pair of filter region-defining rods 33 are configured to be movable in a direction in which the central axis of the filter cage extends. Here, the movement of the pair of filter region-defining rods 33 may be driven, for example, by a stepper motor.For a detailed description and description of the above-described filter device for a human body security check device, reference may be made to the above description and description of the human body security check device, which are not described repeatedly herein.

[0042] From the foregoing, it can be seen that according to the human body security check device and the method of operating the same and the filter device for the human body security check device provided by the present disclosure, two or more pairs of filter layers made of different materials and / or having different thicknesses are provided in the rotatable filter cage to achieve flexible switching of the radiation beam emitted from the human body security check device between a high dosage and an extremely low dosage in a wide dosage range.Furthermore, a pair of movable filter area defining rods are provided at both ends of the filter cage to define a filter area to define a scanning area for the radiation beam, thereby ensuring convenient safety screening of each segment of the human body while reducing unnecessary radiation damage to other parts of the body.

[0043] The purposes, technical schemes, and advantageous effects of the present disclosure have been described in detail with reference to the specific embodiments mentioned above. It should be understood that the contents described above relate only to exemplary embodiments of the present disclosure and are not intended to limit the present disclosure. Any changes, equivalent substitutions, improvements, etc. made within the spirit and scope of the present disclosure are deemed to be included within the scope of the present disclosure.

Claims

[1] A security checking device (100) for the human body, comprising: a radiation source (10) having a radiation beam output (11) adapted to emit a radiation beam; and a beam guiding housing (20) designed to guide the radiation beam emitted by the radiation source (10); wherein the human body security checking device (100) further comprises: a filter device (30) arranged between the radiation beam output of the radiation source (10) and the beam guide housing (20), wherein the filter device (30) comprises: an enclosure (31); and a filter cage (32) arranged in the enclosure (31) and formed by arranging two or more pairs of filter layers (321) made of different materials and / or having different thicknesses in a surrounding manner; wherein the filter cage (32) is rotatable about its central axis so that at least one pair of the two or more pairs of filter layers (321) is capable of filtering the radiation beam from the radiation beam output of the radiation source (10) in order to adjust a delivered dosage of the radiation beam of the human body security screening device (100); wherein the human body security checking device (100) further comprises: a pair of filter region defining rods (33), the pair of filter region defining rods (33) being arranged at respective opposite ends of the filter cage (32) along a central axis of the filter cage (32) and being adapted to be movable in a direction in which the central axis of the filter cage (32) extends to define a filter region, between the pair of filter region defining rods (33), of the at least one pair of the two or more pairs of filter layers (321), to define a scanning region of the radiation beam. [2] A human body security inspection device (100) according to claim 1, wherein: a material and a diameter of the pair of rods (33) defining the filter area are designed to be sufficient to shield and block the radiation beam emitted by the radiation source (10). [3] The human body security inspection device (100) according to claim 1 or 2, further comprising: an input unit configured to send a command to move the pair of filter area defining bars (33) by setting a bar identifier (330) representative of the pair of filter area defining bars (33); and a control unit configured to control the movement of the pair of filter area defining rods (3) based on the commands from the input unit. [4] A human body security inspection device (100) according to claim 3, wherein: the input unit is further configured to set the rod identifier (330) representative of the pair of filter area defining rods (33) on a whole human body optical photogram or a whole human body security screening scan map to define any scanning area of ​​a human body to be screened by moving the rod identifier (330). [5] A human body security inspection device (100) according to any one of claims 1 to 4, wherein: in the filter cage (32), materials and / or thicknesses of the two or more pairs of filter layers (321) are determined on the basis of different radiation filtering requirements for the radiation beam. [6] A human body security inspection device (100) according to any one of claims 1 to 4, wherein: in the filter cage (32), at least one pair of the two or more pairs of filter layers (321) comprises a pair of filter layers (321) arranged around the central axis of the filter cage (32) so as to face each other. [7] A human body security inspection device (100) according to any one of claims 1 to 4, wherein: the filter cage (32) is formed in a short-circuit cage with a gap between two adjacent filter layers (321). [8] A human body security inspection device (100) according to any one of claims 1 to 4, wherein: the human body security screening device (100) is a transmission imaging security screening device or a backscatter imaging security screening device. [9] A method of operating a human body security screening device (100) according to any one of claims 3 to 4, the method comprising: Performing a scan of a human body to be examined in a first scanning mode, wherein the first scanning mode refers to a mode in which the two or more pairs of filter layers (321) are rotated to set a delivered dosage of a radiation beam to a high dosage for scanning, and in the first scanning mode, each region of the human body to be scanned is defined by setting the rod identifier (330) representative of the pair of filter region defining rods (33). [10] The method of claim 9, further comprising: Performing a scan for the human body using a second scanning mode, wherein the second scanning mode refers to a mode in which the two or more pairs of filter layers (321) are rotated to adjust a delivered dosage of the radiation beam to a low dosage for scanning, and in the second scanning mode the scanning of the whole human body is performed. [11] A filter device (30) for a security screening device (100) for the human body, the filter device (30) comprising: an enclosure (31); and a filter cage (32) arranged in the enclosure (31) and formed by arranging two or more pairs of filter layers (321) made of different materials and / or having different thicknesses in a surrounding manner; wherein the filter cage (32) is rotatable about its central axis so that at least one pair of the two or more pairs of filter layers (321) is capable of filtering a radiation beam from a radiation beam output of a radiation source (10) of the human body security screening device (100) in order to adjust a delivered dosage of the radiation beam of the human body security screening device (100); wherein the filter device (30) further comprises: a pair of filter area defining rods (33) having a material and a diameter designed to be sufficient to shield and block the radiation beam emitted by the radiation source (10), each disposed at opposite ends of the filter cage (32) along the central axis and designed to be movable in a direction in which the central axis of the filter cage (32) extends. [12] Filter device (30) according to claim 11, wherein: Materials and / or thicknesses of the two or more pairs of filter layers (321) are determined based on different radiation filtering requirements for the radiation beam. [13] Filter device (30) according to claim 11, wherein: at least one pair of the two or more pairs of filter layers (321) comprises a pair of filter layers (321) arranged around a central axis of the filter cage (32) so as to face each other. [14] Filter device (30) according to claim 11, wherein: the filter cage (32) is formed in a short-circuit cage with a gap between two adjacent filter layers (321).

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