CN103018782A - Single-source low-energy X-ray back scattering and transmission human body detection device - Google Patents
Single-source low-energy X-ray back scattering and transmission human body detection device Download PDFInfo
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- CN103018782A CN103018782A CN2012105252584A CN201210525258A CN103018782A CN 103018782 A CN103018782 A CN 103018782A CN 2012105252584 A CN2012105252584 A CN 2012105252584A CN 201210525258 A CN201210525258 A CN 201210525258A CN 103018782 A CN103018782 A CN 103018782A
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Abstract
Provided is a single-source low-energy X-ray back scattering and transmission human body detection device. An asymmetrical wide fan-shaped angle X ray source and a fan-shaped front collimator are installed outside a detection channel and under one side of a control platform. A geometrical structure for transmission measurement and imaging is formed by a transmission photon beam emitted by the shared X ray source and a transmission detector array. A geometrical structure for back scattering measurement and imaging is formed by a back scattering photon beam emitted by the fan-shaped transmission photon beam through an object to be measured and a back scattering detector array. A radiation shielding layer is arranged between the back scattering detector and the transmission X ray beam, a controllable multi-vane light bar is installed at a ray outlet, and all measurement and control can be finished by one industrial personal computer. The device utilizes the scanning technology combining back scattering and transmission, and is simple in structure, low in price, high in detection speed, high in sensitivity, small in human tolerant dose, free of individual privacy exposure, capable of detecting bombs, explosives, poisons and the like which are hidden in vests and underpants of a human body and suitable for large public safe sites.
Description
One, technical field
The present invention relates to the X ray safety detecting system, the low energy X ray backward scattering of especially single source and transmission human body detecting device.
Two, background technology
X ray is used for that the safety detection of human body is had transmission and backward scattering dual mode.
1, adopt merely the method for transmission, this method makes that to be examined the radiation dose that human body is subject to larger, and effect is not good enough.Three of the Ministry of Public Security adopt the method for X ray transmission to carry out human detection with Yunnan public security bureau cooperation, and its equipment drops into on-the-spot use at home.Through processing, the energy size that detector receives shows with grayscale image, and this method is difficult to detect vest bomb, pants bomb and is hidden in the contraband goodss such as explosive in the human body, in the footwear, drugs, has larger limitation.During external use X ray transmission human body detecting device, all detected personnel are carried out omnidirectional, but blur-free imaging is queried invasion of privacy, suffers the public's extensive opposition.
2, second method is X ray backward scattering method: transmission, absorption and three kinds of situations of scattering can occur in X ray and matter interaction, X ray both domestic and external backward scattering (CBS) method is used chopper wheel and flying-spot scanner technology exactly, becoming with transmission photon direction＞=90
0Direction is measured by the backward scattering photon that penetrates on the tested article with the backward scattering detector array.The effective atomic number Z of backscatter signal and tested article
EffRelevant, show and organism, explosive, drugs etc. can be differentiated with the backscatter images gray scale.The recent research and production of the U.S. goes out backward scattering human body checkout facility, and only 78 base fields of the U.S. in 2010 will be installed 450, its complex structure, detection speed is slower, and the time of detecting a people reaches 10 seconds, and expensive, be not suitable for China's actual conditions, be difficult to apply in developing country.
Three, summary of the invention
The purpose of this invention is to provide a kind of single source low energy X ray backward scattering of two kinds of detections and human body detecting device of transmission of carrying out.The finishing transmission and backward scattering by a shared x-ray source and detect of this equipment.The transmission photon beam that x-ray source penetrates and transmission detector array consist of the geometry structure of transmission measurement and imaging; The geometry structure that the backward scattering photon bundle that is penetrated by fan-shaped transmission photon beam process measured object and backward scattering detector array consist of backward scattering measurement and imaging.When detecting, at first show backward scattering fast detecting result, find no the personnel of contraband goods shadow of doubt, let pass fast.When the discovery suspicious points is measured in backward scattering, further extract quick transmission detected image and backward scattering measurement result relatively, confirm as the contraband goods carrier and given as security careful and the reservation image evidence.Reach simplified apparatus structure to greatest extent, reduce the suffered radiation dose of tested personnel, improve the purpose that detects quality.
The objective of the invention is to reach like this: a kind of single source low energy X ray backward scattering and transmission human body detecting device comprise rack behind rack before the driving frame, plant bottom case, sense channel, the sense channel, human detection passage, travelling belt, industrial computer.It is characterized in that: share the X-ray machine that x-ray source is asymmetric wide segment angle, x-ray source and fan-shaped front collimating apparatus thereof are installed in outside the sense channel, control desk one side-lower, linear transmission detector array and thereafter collimating apparatus be installed in behind the sense channel in the rack, linear transmission detector array and x-ray source are through the asymmetric fan-ray beam formation transmission measurement of front collimating apparatus and the geometry structure of imaging; The backward scattering detector array and thereafter collimating apparatus be installed in before the sense channel in the rack compton backscattering photon beam formation backward scattering measurement of penetrating on backward scattering detector array and the tested article and the geometry structure of imaging.
Be outside equipped with the transmission detectors shielding box in transmission detector array, be outside equipped with backward scattering detector shielding box at the backward scattering detector array.
Between backward scattering detector array and Transmission X beam, be provided with radiation shield.
At the ray exit portal controlled leafy smooth hurdle is installed.
All measure with control and share an industrial computer.
Transmission detector array data disposable plates and USB output interface are installed below behind sense channel in the rack, backward scattering detector array column data disposable plates and USB output interface are installed below before sense channel in the rack.
X-ray source is 100W low energy X ray machine.
Industrial computer is installed on the plant bottom case, before control desk and sense channel between the rack.
The backward scattering detector array is to be of a size of 5.8 * 5.8mm by resembling number
2Small-sized silicon photoelectric diode and cesium iodide scintillation crystal make, backward scattering detector array and data acquisition biography system be the assembly with international standard interface and size; Transmission detector array adopts miniature silicon photoelectric diode and cesium iodide scintillation crystal to make, and transmission detector array and data acquisition biography system are the assemblies with international standard interface and size.
Good effect of the present invention is:
1, single source low energy X ray human body detecting device fully, fully utilized the characteristics of backward scattering (CBS – Compton Backscatter Scanning) with transmission (TR – Transmission Scanning).At first utilize and reach with it density, effective atom coefficient information of various article in the compton backscattering rapid scanning technology for detection trip body, process through the backward scattering data, form the contour images of tested article, do not expose the personnel's of abiding by the law individual privacy, do not find thus the personnel of contraband goods shadow of doubt, let pass fast and delete the total data that backward scattering (CBS) and transmission (TR) are measured; When the discovery suspicious points is measured in backward scattering, further utilizing transmission scan to measure the TR image detection goes out to reach with it shape size, the density thickness information of hidden contraband in the suspicious body, measure thus clearly transmission image, and CBS measurement data and TR measurement data compared, confirm that any contraband person detains pending trial, and preserve the total data of its measurement; As still have doubtful point person, but whether also constant speed is driven in the wrong direction and to be re-started backward scattering (CBS) and transmission (TR) scanning survey, reaffirm to let pass or detain pending trial.
2, this checkout equipment is measured by rapid scanning first, greatly reduces and is examined the radiation dose that the people stands; The backward scattering rapid scanning is measured and data are processed, and only forms the contour images of being examined human body and tested article, does not expose the personnel's of abiding by the law individual privacy, and the personnel of abiding by the law are shown that no longer transmission detects; And to the further clear display transmission of suspicion personnel detected image, can get rid of the crime fact of suspicion or locking lawless people.
3, this equipment is equipped with controlled leafy smooth hurdle at the ray exit portal, by shooting and leafy smooth hurdle adjustment, can use respectively different light hurdle sizes for differing heights, different sexes, all ages and classes, the suffered radiation dose of subject can be reduced to minimum.
4, whole measurements of this equipment share an industrial computer with control; Between backward scattering detector and transmission detectors radiation shield is set, interference and impact that shielding transmission photon is measured the backward scattering photon are measured its transmission and backward scattering and are shared 1 x-ray source; It is simple in structure, volume is less, communication control system simplification, fast, highly sensitive, the simple operation of detection speed.
5, this equipment at first obtains density, the effective atom coefficient information that human body carries various article by X ray backward scattering fast detecting, can fast detecting go out to have or not explosive, drugs, the vest, the pants bomb that particularly detect sheet type have very high sensitivity, and in the clear personnel as early as possible can let pass; Further the transmission of extraction X ray detects terrified suspect and reaches the density thickness information of carrying various article in the body with it, can demonstrate picture rich in detail, and compare with the backward scattering measurement data, further confirm to have or not contraband goods, determine that it is let pass still to detain pending trial.This equipment has increased substantially safety detection quality and detection speed, detection speed can reach per person 0.5 second, be existing transmission checkout equipment detection speed 1/2, backward scattering checkout equipment detection speed 1/20, be suitable for that airport, large-scale meeting-place, meeting concerning foreign affairs etc. are high-grade, the public safety place of guard key most.
6, cheap, the use material benefit of this equipment price is more suitable for China's actual conditions and developing country's demand.
Five, description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the testing process skeleton view, and the subject that stood on the security check passage among the figure detects the contraband goodss such as explosive of hiding in the drugs hidden in vest bomb, pants bomb, front and the lower part of the body that examined human body wears, the footwear.
Fig. 3 is the vertical view of Fig. 1.
Fig. 4 is the backward scattering detection array and adopts biography system component figure.
Fig. 5 is this device detection procedure hardware and software program flow diagram.
Fig. 6 is this device detection procedure process flow diagram.
Among the figure, 1 camera mount anchor point, 2 Stairs, 3 support pulley, 4 travelling belts, 5 plant bottom cases, 6 driving frames, 7 transmission detectors data disposable plates and USB output interface, 8 backward scattering detector data disposable plates and USB output interface, the explosive of hiding in 9 footwear, collimating apparatus before 10 industrial computers, 11 fan-shaped X ray, 12 x-ray sources, 13 Transmission X ray entrances, 14 fan-shaped transmission photon beams, collimating apparatus after 15 transmissions are surveyed, 16 transmission detector array, 17 backward scattering photon bundles, collimating apparatus after 18 backward scatterings are surveyed, the controlled leafy smooth hurdle of 19 X ray exit portals, the drugs of hiding in the 20 backward scattering detector arrays, 21 pants bombs and the lower part of the body, rack behind 22 sense channels, rack before 23 sense channels, 24 backward scattering detector radiation shields, 25 vest bombs and be hidden in the drugs of front, 26 transmission detector array shielding boxs, 27 backward scattering detector array shielding boxs, 28 sense channels, 29 control desks, 30 video camera USB interface output lines, 31 camera mounts, 32 video cameras.
Five, embodiment
In the present embodiment, the structure of single source low energy X ray backward scattering and transmission human body detecting device is referring to accompanying drawing 1.
All measure with control and share an industrial computer 10, industrial computer is installed on the plant bottom case 5, before control desk 29 and sense channel between the rack 23.Select the 100W X-ray production apparatus of a domestic small volume, stability height, asymmetric wide segment angle as the shared x-ray source 12 of transmission measurement and compton backscattering measurement, x-ray source 12 and fan-shaped front collimating apparatus 11 thereof are installed in outside the sense channel, control desk one side-lower.Control desk 29 is equipped with display, and operating personnel can adjust opertaing device according to the demonstration of display.
Linear transmission detector array 16 and thereafter collimating apparatus 15 be installed in behind the sense channel in the rack 22 transmission detector array 16 and the geometry structure that consists of transmission measurements and imaging through the asymmetric fan-shaped transmission photon beam 14 of collimating apparatus 11 before the X ray.
Compton backscattering detector array 20 and thereafter collimating apparatus 18 be installed in before the sense channel in the rack 23 compton backscattering detector array 20 and the geometry structure that stand in the backward scattering photon bundle 17 that penetrates on examined human body on the sense channel 28 and the entrained article and consist of backward scattering measurements and imaging.Referring to Fig. 2, in the present embodiment, general backward scattering detector array 20 with stand in the backward scattering photon bundle 17 formation backward scattering measurements penetrated on drugs 21, the vest bomb of hiding in explosive 9, pants bomb and the lower part of the body of being hidden in examined human body on the passage 28 and the human body footwear and the drugs 25 that are hidden in the front and the geometry structure of imaging.
Between backward scattering detector 20 and transmission photon beam 14 radiation shield 24 is set, shielding transmission photon is on interference and the impact of Compton photon survey, in order to solve the problem that shares an x-ray source in transmission detection and the backward scattering testing process.
In order to reduce human body detecting device environmental radiation dose on every side, be outside equipped with transmission detector array shielding box 26 in transmission detector array 16, be outside equipped with backward scattering detector shielding box 27 at the backward scattering detector array.Simultaneously, be provided with controlled leafy smooth hurdle 19 at the X ray exit portal, regulate the light hurdle according to subject's different heights, guarantee that its fan-shaped transmission photon beam shines below the shoulder of different human body, make all subjects' head not be subjected to the irradiation of ray.
In the present embodiment, the transmission detector array 16 of single source low energy X ray human body detecting device adopts the number that resembles of domestic trial-production and processing to be of a size of 1.6 * 2.0mm
2Miniature silicon photoelectric diode (Si-PIN) and cesium iodide (CsI (Tl)) scintillation crystal is made the detector assembly with international standard interface; Compton backscattering detector array 20 is that the number that resembles of developing voluntarily is of a size of 5.8 * 5.8mm
2Small-sized silicon photoelectric diode (Si-PIN) and cesium iodide (CsI (Tl)) scintillation crystal is made the detector assembly with international standard interface.
Referring to accompanying drawing 4.The transmission measurement data acquisition passes system, the backward scattering measurement data is adopted the biography system and is comprised of 64 road and No. 16 low-noise preamplifiers, multichannel main amplifier, multichannel analog signals acquisition module, A-D converter, programmable data processing circuit, USB interface respectively.The backward scattering that collects or transmission measurement data-signal are after 64 road or No. 16 low-noise preamplifiers amplify, after multichannel pmultiple amplifier amplifies by the collection of multichannel analog signals acquisition module, carry out analog to digital conversion again, processed by programmable data processing circuit and export by USB interface.
Testing process of the present invention is referring to accompanying drawing 2,5,6.Among Fig. 5, solid line represents the fast detecting flow process, and dotted line represents again reverse constant speed testing process, and dot-and-dash line represents that the suspect gives as security careful route.
Testing process comprises human body shooting, light modulation hurdle, selects suitable hardware controls, data acquisition, data are processed and the result exports several steps.Human body shooting recorder's body characteristics and height are adjusted to controlled leafy smooth hurdle below the shoulders of human body, avoid Head irradiation.According to solid line among Fig. 5 equipment is carried out hardware controls, comprise that ray machine control, power supply are controlled, rapid clockwise is controlled to transmission, carry out fast backward scattering CBS measurement data acquisition and transmission TR measurement data acquisition simultaneously.Show that at first CBS measures and result, the non-a suspect who does not find to carry contraband goods is let pass immediately and deletes CBS and TR measurement total data; When the discovery suspicious points is measured in backward scattering, further show the clear transmission TR image that transmission scan detects, and compare with the CBS measurement data that eliminating suspicion person deletes total data and lets pass; Confirm that any contraband person detains pending trial, and preserve the total data of its measurement; As still have doubtful point person, and according to dotted line among Fig. 5 the suspect is carried out constant speed and drive in the wrong direction and re-start backward scattering (CBS) and transmission (TR) scanning survey, reaffirm whether let pass or detain pending trial.
Concrete testing process is: before the subject enters sense channel, through adjusting the scale mistake, by camera record human body Facial Features, highly, sex, differentiate its children, less, blue or green, in, the age bracket of waiting for a long time, adjust again controlled leafy smooth hurdle 19, make its fan-shaped transmission photon beam carry out fast detecting below shining the shoulder of different human body; Can only shine leg and pin to child, teenager according to actual conditions, the pregnant woman is only shone chest, leg and pin, even allow it carry out hand inspection or avoid detecting.The location of video camera is determined that by support anchor point 1 and level altitude support 31 video camera 32 will detect data transmission to industrial computer 10, control desk 29 displays with USB output interface line 30.
After the subject enters sense channel 28 fast, carry out simultaneously fast backward scattering and transmission with backward scattering detector array 20 and transmission detector array 16 and detect.
When human body after sense channel 28 is stood, when regional by the transmission measurement that is sent to sense channel on the travelling belt 4, the X ray that is penetrated by radiographic source 12 is collimated into asymmetric fan-shaped transmission photon beam 14 through fan-shaped front collimating apparatus 11, pass Transmission X ray entrance 13, examined human body and hiding contraband goods are crossed in transmission again, pass rear collimating apparatus 15, carry out the transmission rapid scanning by transmission detector array 16 and measure, the data of surveying temporary, will not show image; When human body passes to the backward scattering measured zone simultaneously, transmission photon beam 14 is mapped on the contraband goods of being examined human body and hiding and penetrates backward scattering photon bundle 17, and the backward scattering photon that passes the rear collimating apparatus 18 of backward scattering detection carries out the backward scattering rapid scanning by backward scattering detector array 20 and measures; Confirmed by the backward scattering measurement result, do not find the examined personnel of shadow of doubt, let pass, and deletion CBS and TR measurement total data, in order to avoid invade the personnel's that abide by the law privacy; Obtained to be examined density, effective atom coefficient information of the contraband goodss such as explosive of hiding in the drugs hidden in vest bomb, pants bomb, front and the lower part of the body that human body wears, the footwear by the backward scattering measurement result, process contrast by the backward scattering data, and formation contour images, measure the discovery suspicious points by backward scattering, extract immediately the transmission measurement data, and demonstration TR image, the image software that the backward scattering of application autonomous research and development combines with transmission measurement carries out data to be processed, and compare with the CBS measurement data, confirm that any contraband person detains pending trial; To the person that can not confirm to have or not the hidden contraband, to delimit the Suspected Area, adjust leafy smooth hurdle and aim at the Suspected Area, reduce again to be examined the suffered radiation dose in position as far as possible, constant speed antikinesis travelling belt, re-start CBS and TR scanning survey, reaffirm without contraband goods person and let pass, and deletion CBS and TR measurement total data; Confirm that any contraband person detains pending trial.
Referring to accompanying drawing 2, after testing, the subject is detected drugs, the vest bomb of hiding in explosive, pants bomb and the lower part of the body that is hidden in the footwear and is hidden in the drugs of front.
Show through domestic and international rig-site utilization: X ray transmission human body check system is difficult to effectively differentiate the effectively low material of atom coefficient such as fabric, plastics, explosive, drugs; The backscatter images gray scale that X ray backward scattering chopper wheel and flying-spot scanner technology obtain shows and organism, explosive, drugs etc. can be differentiated, but this anthropoid checkout facility complex structure, detection speed is slower, expensive, be not suitable for China's actual conditions, be difficult to apply in developing country.Test result shows: single source low energy X ray backward scattering of the present invention takes full advantage of the rapid scanning technical characterstic that backward scattering combines with transmission with the transmission human body detecting device, and have simple in structure, low price, detection speed is very fast, sensitivity is very high, the suffered dosage of people is very little, do not expose the characteristics such as individual privacy, the image software that utilizes the backward scattering of independent research to combine with transmission measurement, carrying out data processes and imaging, its process flow diagram is referring to accompanying drawing 6, can detect the vest bomb that is hidden in human body, explosive in pants bomb and the human body, drugs etc. can increase substantially human detection speed and detect quality.
Claims (6)
1. single source low energy X ray backward scattering and transmission human body detecting device, comprise driving frame (6), plant bottom case (5), rack (23) before the sense channel, rack behind the sense channel (22), human detection passage (28), travelling belt (4), industrial computer (10), it is characterized in that: share an x-ray source, x-ray source (12) is the X-ray production apparatus of asymmetric wide segment angle, x-ray source (12) and fan-shaped front collimating apparatus (11) thereof are installed in outside the sense channel, control desk (29) one side-lowers, linear transmission detector array (16) and thereafter collimating apparatus (15) be installed in behind the sense channel in the rack (22), linear transmission detector array (16) and x-ray source (12) consist of the geometry structure of transmission measurement and imaging through the asymmetric fan-ray beam (14) of front collimating apparatus (11); Backward scattering detector array (20) and thereafter collimating apparatus (18) be installed in before the sense channel in the rack (23), the compton backscattering photon beam (17) that penetrates on backward scattering detector array (20) and the tested article consists of the geometry structure of backward scattering measurement and imaging;
Between backward scattering detector array and Transmission X beam, be provided with radiation shield (24);
At the ray exit portal controlled leafy smooth hurdle (19) is installed;
All measure with control and share an industrial computer (10);
Below in the rack behind sense channel (22) is equipped with transmission detector array data disposable plates and USB output interface (7), and the below in the rack before sense channel (23) is equipped with backward scattering detector array column data disposable plates and USB output interface (8).
2. human body detecting device as claimed in claim 1, it is characterized in that: described transmission detector array (16) is outside equipped with transmission detector array shielding box (26), is outside equipped with backward scattering detector shielding box (27) at the backward scattering detector array.
3. human body detecting device as claimed in claim 1, it is characterized in that: described x-ray source (12) is 100W low energy X ray machine.
4. human body detecting device as claimed in claim 1 is characterized in that: described industrial computer (10) be installed in plant bottom case (5) upper, be positioned between control desk (29) and the front rack (23) of sense channel.
5. human body detecting device as claimed in claim 1, it is characterized in that: described backward scattering detector array is to be made by small-sized silicon photoelectric diode and cesium iodide scintillation crystal, and backward scattering detector array and data acquisition biography system have international standard interface and standard-sized assembly; Described transmission detector array is to make homemade goods by miniature silicon photoelectric diode and cesium iodide scintillation crystal, and transmission detector array and data acquisition biography system have international standard interface and standard-sized assembly.
6. human body detecting device as claimed in claim 5 is characterized in that: described backward scattering detector array is to be of a size of 5.8 * 5.8mm by resembling number
2Small-sized silicon photoelectric diode and cesium iodide scintillation crystal make, described transmission detector array is to resemble number to be of a size of 1.6 * 2.0mm
2Miniature silicon photoelectric diode and cesium iodide scintillation crystal product.
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| CN201210525258.4A CN103018782B (en) | 2012-12-10 | 2012-12-10 | Single source low energy X ray backward scattering and transmission human body detecting device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104267053A (en) * | 2014-09-30 | 2015-01-07 | 包微微 | Novel detector for liquid prohibited articles |
| CN107655906A (en) * | 2017-09-26 | 2018-02-02 | 同方威视技术股份有限公司 | Vehicle safe examination system, method and controller |
| CN107991326A (en) * | 2017-12-18 | 2018-05-04 | 公安部第三研究所 | Single so many energy radioscopy in source merges safe examination system with scattering |
| CN112965121A (en) * | 2021-02-03 | 2021-06-15 | 南京航空航天大学 | Radiation imaging security inspection system based on liquid metal random coding |
| CN114624785A (en) * | 2022-05-16 | 2022-06-14 | 天津速通科技有限公司 | Same light source setting method suitable for novel double-source mixed detection type channel type security inspection system |
| WO2024032357A1 (en) * | 2022-08-08 | 2024-02-15 | 清华大学 | Ray source mechanism and static computed tomography equipment |
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| CN203054242U (en) * | 2012-12-10 | 2013-07-10 | 四川大学 | Single-source low-energy X-ray Compton backscatter scanning and transmission scanning human body detection device |
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| US5642393A (en) * | 1995-09-26 | 1997-06-24 | Vivid Technologies, Inc. | Detecting contraband by employing interactive multiprobe tomography |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104267053A (en) * | 2014-09-30 | 2015-01-07 | 包微微 | Novel detector for liquid prohibited articles |
| CN107655906A (en) * | 2017-09-26 | 2018-02-02 | 同方威视技术股份有限公司 | Vehicle safe examination system, method and controller |
| CN107991326A (en) * | 2017-12-18 | 2018-05-04 | 公安部第三研究所 | Single so many energy radioscopy in source merges safe examination system with scattering |
| CN112965121A (en) * | 2021-02-03 | 2021-06-15 | 南京航空航天大学 | Radiation imaging security inspection system based on liquid metal random coding |
| CN114624785A (en) * | 2022-05-16 | 2022-06-14 | 天津速通科技有限公司 | Same light source setting method suitable for novel double-source mixed detection type channel type security inspection system |
| CN114624785B (en) * | 2022-05-16 | 2022-08-19 | 天津速通科技有限公司 | Same light source setting method suitable for novel double-source mixed detection type channel type security inspection system |
| WO2024032357A1 (en) * | 2022-08-08 | 2024-02-15 | 清华大学 | Ray source mechanism and static computed tomography equipment |
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Granted publication date: 20150826 Termination date: 20171210 |