CN204008508U - A kind of caliberating device of CT image and a kind of CT system - Google Patents
A kind of caliberating device of CT image and a kind of CT system Download PDFInfo
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- CN204008508U CN204008508U CN201420346658.3U CN201420346658U CN204008508U CN 204008508 U CN204008508 U CN 204008508U CN 201420346658 U CN201420346658 U CN 201420346658U CN 204008508 U CN204008508 U CN 204008508U
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Abstract
The utility model provides a kind of caliberating device and a kind of CT system of CT image, comprise: fixed calibration element, storage unit, collecting unit and map unit, wherein: described fixed calibration element is arranged on outside the passage area of CT scan device, in maximum reconstruction regions; The theoretical value of described storage unit for storing described fixed calibration element; Described collecting unit is for obtaining the actual reconstruction image of described fixed calibration element; Described map unit is for obtaining the comparative result of described actual reconstruction image and the corresponding theoretical value of storing.The utility model can effectively improve calibration mass, promotes image calibration effect, has improved the reliability of CT scan device, has saved maintenance cost, is of very high actual application value.
Description
Technical field
The utility model relates to radiant image detection technique field, relates in particular to a kind of caliberating device and a kind of CT system of CT image.
Background technology
CT technology, owing to can eliminating the impact of overlapped object, has been brought into play vital role in the occasions such as safety inspection.Traditional CT adopts slip-ring device to obtain the data for projection in different angles by the rotation of X source and detector, obtains faultage image by method for reconstructing, thereby obtains the internal information of detected luggage and articles.Multi-power spectrum analysis refers to and utilizes certain material to differentiate this material to the difference in the X ray absorptive character of different-energy.CT technology coordinates multi-power spectrum analytical technology, current luggage and articles checkout facility can be rebuild atomic number and the electron density of optional position, analyte inside, realize the identification of substance classes, in the detection such as explosive, drugs, played good effect.
But, no matter be traditional CT or multi-power spectrum CT, due to the inconsistency of ray machine and detector, the reconstruction image of the CT equipment of same model numerically always there are differences, and aging along with the increase of working time, ray machine, detector, even same CT equipment, rebuilds image and numerically also can have drift, depart from the situation while dispatching from the factory.In order to address the above problem, CT equipment, in the time dispatching from the factory with periodic maintenance, all can carry out staking-out work, by the workpiece of scanning certain material, reconstruction image values and workpiece actual value is compared, and calibrating parameters after determining, realizes the rear demarcation of CT image.
But, above-mentioned traditional rear scaling method has following deficiency: on the one hand, the aging of CT equipment is a lasting process, can only regularly carry out and demarcate flow process, as annual 1～2 time, this means rear calibrating parameters can not be all optimum in free, and flow process is technical stronger owing to demarcating, must have slip-stick artist after sale to realize, maintenance cost increases, and likely takies equipment normal working hours; On the other hand, be subject to the impact of the factors such as detector, belt, channel shape, reconstruction algorithm, the difference of rebuilding between numerical value and ideal value is not that regional is all identical on faultage image, and traditional demarcation workpiece is positioned in the tool box of a medium volume or smaller size smaller conventionally, be put on CT travelling belt and send into scan channel, realize and demarcating, therefore under this method, often only have demarcate after the numerical value of belt near zone better, and other regions can not obtain best calibration result.。
Utility model content
(1) technical matters that will solve
The utility model provides a kind of caliberating device and a kind of CT system of CT image, with solve in the rear calibration technique of prior art CT image, demarcate not prompt enough, the technical matters that accuracy is not high.
(2) technical scheme
For solving the problems of the technologies described above, the utility model provides a kind of caliberating device of CT image, comprising: fixed calibration element, storage unit, collecting unit and map unit, wherein:
Described fixed calibration element is arranged on outside the passage area of CT scan device, in maximum reconstruction regions;
The theoretical value of described storage unit for storing described fixed calibration element;
Described collecting unit is for obtaining the actual reconstruction image of described fixed calibration element;
Described map unit is for obtaining the comparative result of described actual reconstruction image and the corresponding theoretical value of storing.
Further,
Described fixed calibration element is one or more groups, and every group of calibration element is one or more.
Further,
The actual reconstruction image of described fixed calibration element comprises: one or more in attenuation coefficient under the high energy attenuation coefficient of fixed calibration element, low energy attenuation coefficient, a certain specific X ray energy, atomic number, electron density, Density Distribution taking element-specific as sill are rebuild images;
Correspondingly, the theoretical value of described fixed calibration element comprises: one or more theoretical values in attenuation coefficient under the high energy attenuation coefficient of fixed calibration element, low energy attenuation coefficient, a certain specific X ray energy, atomic number, electron density, Density Distribution taking element-specific as sill.
Further, the material of described fixed calibration element is:
One or more in water, graphite, aluminium.
Further,
One or more positions in the passage side that is arranged on CT scan device of described fixed calibration element, channel roof, belt below.
Further,
Described collecting unit is also for obtaining the scan rebuilding image of CT scan object;
Described device also comprises: correcting unit, be connected respectively with map unit with described collecting unit, and for receiving the comparative result of described scan rebuilding image and described actual reconstruction image and the corresponding theoretical value of storing, output calibration is rebuild image.
On the other hand, the utility model also provides a kind of CT system, comprises the caliberating device of the CT image described in as above any one.
(3) beneficial effect
Visible, in the caliberating device and a kind of CT system of CT image provided by the utility model, can utilize fixed calibration element to carry out real-time calibration to CT scan device, remove from and in traditional scaling method of CT scan device, needed regularly to carry out the link of demarcating after artificial, can effectively improve calibration mass, promote image calibration effect, improve the reliability of CT scan device, save maintenance cost, be of very high actual application value; And, can obtain the corrected value of each different piece in the maximum reconstruction regions of CT scan device by the utility model, instead of only be confined to, near passage area, can realize more meticulous image rectification.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the caliberating device basic structure schematic diagram of the utility model Embodiment C T image;
Fig. 2 is a kind of preferred structure schematic diagram of the caliberating device of the utility model Embodiment C T image;
Fig. 3 is the practical application schematic flow sheet of the caliberating device of the utility model Embodiment C T image;
Fig. 4 is passage area and the maximum reconstruction regions schematic diagram of CT scan device;
Fig. 5 is fixed calibration element placement location schematic diagram in the caliberating device of the utility model Embodiment C T image.
Embodiment
For making object, technical scheme and the advantage of the utility model embodiment clearer, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiment provides a kind of caliberating device of CT image, referring to Fig. 1, comprising:
Fixed calibration element 101, is arranged on outside the passage area 1 of CT scan device, in maximum reconstruction regions 2;
Storage unit 102, for storing the theoretical value of described fixed calibration element 101;
Collecting unit 103, for gathering the data for projection of described fixed calibration element 101, obtains the actual reconstruction image of described fixed calibration element 101;
Map unit 104, for by described actual reconstruction image and the corresponding theoretical value comparison of storing, sets up the mapping function that is theoretical value by described actual reconstruction image rectification.
In Fig. 1,3 is radiographic source, and 4 is travelling belt.
Preferably, fixed calibration element 101 can be one or more groups, and every group of calibration element can be also one or more.
Preferably, the actual reconstruction image of fixed calibration element 101 can comprise: one or more in the high energy attenuation coefficient of fixed calibration element 101, low energy attenuation coefficient, atomic number, electron density, Density Distribution taking element-specific as sill are rebuild images; Correspondingly, the theoretical value of fixed calibration element 101 also can comprise: one or more theoretical values in attenuation coefficient under the high energy attenuation coefficient of fixed calibration element 101, low energy attenuation coefficient, a certain specific X ray energy, atomic number, electron density, Density Distribution taking element-specific as sill, element-specific herein can be the elements such as carbon, water or aluminium.
Preferably, the material of fixed calibration element 101 can be: water, graphite, aluminium etc. are demarcated material.
Preferably, the position of fixed calibration element 101 can be below the passage side of CT scan device, channel roof, belt etc., to obtain the corrected value of each different piece in the maximum reconstruction regions 2 of CT scan device, instead of be only confined to, near passage area 1, can realize more meticulous image rectification.
Preferably, collecting unit 103 can also be used for obtaining the scan rebuilding image of CT scan object; Correspondingly, device can also comprise: correcting unit 201, see Fig. 2, with collecting unit, 103 are connected respectively with map unit 104, and for receiving the comparative result of described scan rebuilding image and described actual reconstruction image and the corresponding theoretical value of storing, output calibration is rebuild image.
Taking the practical application flow process of the caliberating device of the CT image to the utility model embodiment in dual intensity safety check CT as example, describe the specific implementation process of the utility model embodiment in detail below, participate in Fig. 3:
Step 301: fixed calibration element is placed in outside the passage area of dual intensity safety check CT, in maximum reconstruction regions.
The effective coverage that common scan channel can be placed object all can be less than the scanister maximum region that can rebuild in theory, as shown in Figure 4, therefore passage exterior domain some can rebuild, but in the time of real work, outside passage, can not have object, therefore this part is not generally rebuild out.
In the utility model embodiment, can utilize above-mentioned zone, fixed calibration element is placed in outside the passage area of dual intensity safety check CT, in maximum reconstruction regions, wherein, in the present embodiment, 6 groups of fixed calibration elements are used altogether, every group of fixed calibration element includes 7 three kinds, pure water post 5, graphite column 6 and aluminium post, sees Fig. 5, and stores every theoretical value of above-mentioned fixed calibration element.In dual intensity safety check CT, utilize dual intensity CT to rebuild principle, can rebuild high energy attenuation coefficient, low energy attenuation coefficient, atomic number and four kinds of reconstruction images of electron density, because atomic number and electron density are rebuild image and are had important effect for the identification of material, therefore in the present embodiment, selection atomic number and electron density reconstruction image are demarcated.The atomic number of above-mentioned three kinds of materials and the theoretical value of electron density are known, in the present embodiment, can utilize storage unit that the atomic number of water, graphite and aluminum and electron density theoretical value are stored.
Step 302: the actual reconstruction image that obtains 6 groups of fixed calibration elements.
In the present embodiment, gather the data for projection of the fixed calibration element of above-mentioned 6 groups of different materials by collecting unit, obtain its actual reconstruction image.
Step 303: by actual reconstruction image and the corresponding theoretical value comparison of storing, obtain comparative result.
In this step, the corresponding theory value of water, graphite and aluminum that actual reconstruction image collecting unit being collected by map unit and storage unit are stored compares respectively, obtain comparative result, realize respectively atomic number that D orders and the correction of electron density.
Step 304: obtain the scan rebuilding image of CT scan object, the comparative result according to described scan rebuilding image and described actual reconstruction image with the corresponding theoretical value of storing, output calibration is rebuild image.
In this step, first obtain the scan rebuilding image of CT scan object by collecting unit, and then according to actual reconstruction image before the comparative result with the corresponding theoretical value of storing, obtain corrected reconstructed image.
So far, completed the overall process of the practical application flow process of the caliberating device of the utility model Embodiment C T image.
The utility model embodiment also provides a kind of CT system, comprises the caliberating device of the CT image described in as above any one.
Visible, the utility model embodiment at least has following beneficial effect:
In the caliberating device of the CT image providing at the utility model embodiment and a kind of CT system, can utilize fixed calibration element to carry out real-time calibration to CT scan device, remove from and in traditional scaling method of CT scan device, needed regularly to carry out the link of demarcating after artificial, can effectively improve calibration mass, promote image calibration effect, improve the reliability of CT scan device, saved maintenance cost, be of very high actual application value; And, can obtain the corrected value of each different piece in the maximum reconstruction regions of CT scan device by the utility model embodiment, instead of only be confined to, near passage area, can realize more meticulous image rectification.
Finally it should be noted that: above embodiment only, in order to the technical solution of the utility model to be described, is not intended to limit; Although the utility model is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of the each embodiment technical scheme of the utility model.
Claims (7)
1. a caliberating device for CT image, is characterized in that, comprising: fixed calibration element, storage unit, collecting unit and map unit, wherein:
Described fixed calibration element is arranged on outside the passage area of CT scan device, in maximum reconstruction regions;
The theoretical value of described storage unit for storing described fixed calibration element;
Described collecting unit is for obtaining the actual reconstruction image of described fixed calibration element;
Described map unit is for obtaining the comparative result of described actual reconstruction image and the corresponding theoretical value of storing.
2. the caliberating device of CT image according to claim 1, is characterized in that:
Described fixed calibration element is one or more groups, and every group of calibration element is one or more.
3. the caliberating device of CT image according to claim 1, is characterized in that:
The actual reconstruction image of described fixed calibration element comprises: one or more in attenuation coefficient under the high energy attenuation coefficient of fixed calibration element, low energy attenuation coefficient, a certain specific X ray energy, atomic number, electron density, Density Distribution taking element-specific as sill are rebuild images;
Correspondingly, the theoretical value of described fixed calibration element comprises: one or more theoretical values in attenuation coefficient under the high energy attenuation coefficient of fixed calibration element, low energy attenuation coefficient, a certain specific X ray energy, atomic number, electron density, Density Distribution taking element-specific as sill.
4. the caliberating device of CT image according to claim 1, is characterized in that, the material of described fixed calibration element is:
One or more in water, graphite, aluminium.
5. the caliberating device of CT image according to claim 1, is characterized in that:
One or more positions in the passage side that is arranged on CT scan device of described fixed calibration element, channel roof, belt below.
6. the caliberating device of CT image according to claim 1, is characterized in that:
Described collecting unit is also for obtaining the scan rebuilding image of CT scan object;
Described device also comprises: correcting unit, be connected respectively with map unit with described collecting unit, and for receiving the comparative result of described scan rebuilding image and described actual reconstruction image and the corresponding theoretical value of storing, output calibration is rebuild image.
7. a CT system, is characterized in that, comprises the caliberating device of the CT image as described in any one in claim 1 to 6.
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| CN201420346658.3U CN204008508U (en) | 2014-06-25 | 2014-06-25 | A kind of caliberating device of CT image and a kind of CT system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015196852A1 (en) * | 2014-06-25 | 2015-12-30 | 清华大学 | Method and device for calibrating ct image and ct system |
| WO2017067180A1 (en) * | 2015-10-22 | 2017-04-27 | 同方威视技术股份有限公司 | Calibration device, method and system used for substance distinguishing |
| WO2017113847A1 (en) * | 2015-12-29 | 2017-07-06 | 同方威视技术股份有限公司 | Examination system for inspection and quarantine and method thereof |
| US10416344B2 (en) | 2015-12-29 | 2019-09-17 | Cints Co. Ltd. | Inspection devices for quarantine |
-
2014
- 2014-06-25 CN CN201420346658.3U patent/CN204008508U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015196852A1 (en) * | 2014-06-25 | 2015-12-30 | 清华大学 | Method and device for calibrating ct image and ct system |
| WO2017067180A1 (en) * | 2015-10-22 | 2017-04-27 | 同方威视技术股份有限公司 | Calibration device, method and system used for substance distinguishing |
| WO2017113847A1 (en) * | 2015-12-29 | 2017-07-06 | 同方威视技术股份有限公司 | Examination system for inspection and quarantine and method thereof |
| US10416344B2 (en) | 2015-12-29 | 2019-09-17 | Cints Co. Ltd. | Inspection devices for quarantine |
| US10436932B2 (en) | 2015-12-29 | 2019-10-08 | Nuctech Company Limited | Inspection systems for quarantine and methods thereof |
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