CN106539590B - Computer tomography bearing calibration and computed tomography imaging system - Google Patents
Computer tomography bearing calibration and computed tomography imaging system Download PDFInfo
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- CN106539590B CN106539590B CN201510598603.0A CN201510598603A CN106539590B CN 106539590 B CN106539590 B CN 106539590B CN 201510598603 A CN201510598603 A CN 201510598603A CN 106539590 B CN106539590 B CN 106539590B
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Abstract
A kind of computer tomography bearing calibration of present invention proposition and computed tomography imaging system, the computer tomography bearing calibration include the following steps：Obtain the corresponding first Air correction table of the first temperature of detector；When detector is in second temperature, air scanning is carried out, the second Air correction table is obtained based on air scanning and the first Air correction table；The image obtained under second temperature is corrected using the second Air correction table.The present invention can rapidly and effectively correct detector gain when the temperature of detector is not in the first temperature, and the second Air correction table at the second temperature is generated.
Description
【Technical field】
The present invention relates to computer tomography (CT, Computed Tomography) technical fields, more particularly to one kind
The bearing calibration of computer tomography and its system.
【Background technology】
Computer tomography (Computed Tomography, abbreviation CT) be with X-ray to the privileged site of human body by
Certain thickness level is scanned, and since different tissues is different to the absorbability of X-ray, can use computer weight
Build out the image of fault plane.
In computed tomography imaging system, detector is an important component, for obtaining the X-ray after human body
Signal.In the production process of detector, it is impossible to which it is exactly the same, the ruler of pixel unit to accomplish all pixels unit all
The response in reflecting layer, electrooptical device between very little, surface flatness, pixel unit, the noise of data acquisition electronics system
Etc., all of these factors taken together, which integrates, to cause the gain (gain) of the pixel unit of detector different.In addition, detector increases
Benefit may change over time.If just will produce cyclic annular or banding artifact without correction to detector gain.
In order to compensate for the change in gain in detector difference channel and different time, need to carry out primary sky at regular intervals
Gas scans, and scans data when not having any object in one group of visual field, the gain of calculating detector unit, to obtain a whole set of
Checking list.The checking list is used in image reconstruction, compensates the gain of detector.
A whole set of standard correction gauge includes the correction parameter of different scanning agreement at a set temperature, this set standard school
The term of validity of positive table is longer, expired every time to regenerate a set of new standard scale.And it generates used in a whole set of standard correction gauge
Air scanning time it is also longer, mostly at 30 minutes or more, sometimes even need 1 to 2 hour or longer time.
Under normal conditions, this set standard correction gauge is by the image reconstruction for all scan datas.But it is transported by system
The influences such as market condition, season and scanning room environment temperature, in system operation, larger change may occur for the temperature of detector
Change, even more than the scope of application (set temperature) of calibration correction table.When the Current Temperatures of detector are more than the set temperature upper limit
Afterwards, the validity of standard correction gauge reduces, it means that for the image of certain scannings, may there is artifact appearance, such case
It will likely can influence the diagnosis of clinician.
Existing computed tomography imaging system will be prompted to user current after detector temperature is more than set temperature
In the case of have the risk for generating artifact, the influence of temperature change is reduced without positive measure.In general, clinician needs
It waits for detector temperature to return within the scope of set temperature, can just continue to scan, this has seriously affected computerized tomography
The service efficiency of scanning system.
New detector gain can quickly and effectively be corrected other than set temperature it is, therefore, desirable to provide a kind of
Method.
【Invention content】
What the present invention solved be existing computer tomography standard correction gauge when more than set temperature validity
The problem of reduction.
To solve the above problems, the present invention proposes a kind of computer tomography bearing calibration, include the following steps：
Obtain the corresponding first Air correction table of the first temperature of detector；
When detector is in second temperature, air scanning is carried out, based on air scanning and the first Air correction table
Obtain the second Air correction table；
The image obtained under second temperature is corrected using the second Air correction table.
Optionally, the second temperature is higher than the first temperature.
Optionally, the progress air scanning obtains the second air based on air scanning and the first Air correction table
Checking list includes：
Air scanning is carried out, air scanning includes at least one set of scan protocols, according to air scanning acquisition the
Second Air correction table of at least one set of scan protocols at a temperature of two；
According to the first Air correction table and the corresponding second Air correction table of at least one set of scan protocols, the second temperature is obtained
The lower corresponding second Air correction table of remaining scan protocols of degree.
Optionally, the progress air scanning obtains the second air based on air scanning and the first Air correction table
Checking list includes：
It obtains the corresponding second Air correction table of at least one set of scan protocols and subtracts corresponding first Air correction table
The difference is added with the corresponding first Air correction table of remaining scan protocols, obtains remaining scanning by obtained difference
The corresponding second Air correction table of agreement.
Optionally, when the detector is in the first temperature, using being obtained at a temperature of the first Air correction table pair first
Image be corrected.
Optionally, it when the detector becomes second temperature from the first temperature, is prompted.
The present invention also proposes a kind of computed tomography imaging system, including：
First unit, for obtaining the corresponding first Air correction table of the first temperature of detector；
Second unit carries out air scanning for when detector be in second temperature, based on air scanning and the
One Air correction table obtains the second Air correction table；
Third unit, for being corrected to the image obtained under second temperature using the second Air correction table.
Optionally, the second temperature is higher than the first temperature.
Optionally, the second unit is specifically used for realizing following steps：
Air scanning is carried out, air scanning includes at least one set of scan protocols, according to air scanning acquisition the
Second Air correction table of at least one set of scan protocols at a temperature of two；
According to the first Air correction table and the corresponding second Air correction table of at least one set of scan protocols, the second temperature is obtained
The lower corresponding second Air correction table of remaining scan protocols of degree.
Optionally, the second unit is specifically used for realizing following steps：
It obtains the corresponding second Air correction table of at least one set of scan protocols and subtracts corresponding first Air correction table
The difference is added with the corresponding first Air correction table of remaining scan protocols, obtains remaining scanning by obtained difference
The corresponding second Air correction table of agreement.
Optionally, the third unit is additionally operable to, when the detector is in the first temperature, use the first Air correction
The image obtained at a temperature of table pair first is corrected.
Optionally, further include Unit the 4th, for when the detector becomes second temperature from the first temperature, being carried
Show.
The present invention, which compares the prior art, following advantageous effect：
After the temperature of detector is more than the first temperature of the first Air correction table, it can be scanned by air and generate second
At a temperature of the second Air correction table can also to detector gain so as to when detector temperature is not in the first temperature
Effectively corrected.
Further, in an alternative embodiment of the invention, at least one set of scanning obtained can be scanned according to air
Second Air correction table of agreement and the first Air correction table of remaining scan protocols are extrapolated under second temperature remaining and are swept
Retouch the second Air correction table of agreement.Only include at least one set of scanning in air scanning due to obtaining the second Air correction table
Agreement, number is less than the scan protocols quantity for generating the first Air correction table, therefore can obtain second within a short period of time
At a temperature of a whole set of the second Air correction table (checking list for including all scan protocols), so as to not exist in detector temperature
When the first temperature, detector gain can also be corrected quickly.
【Description of the drawings】
Fig. 1 is a kind of structural schematic diagram of computed tomography imaging system；
Fig. 2 is the flow chart of the computer tomography method of one embodiment of the invention；
Fig. 3 is the structure chart of the computed tomography imaging system of one embodiment of the invention；
Fig. 4 is the flow chart of the computer tomography bearing calibration of another embodiment of the present invention.
【Specific implementation mode】
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings to the present invention
Specific implementation mode be described in detail.
Fig. 1 is a kind of structural schematic diagram of computed tomography imaging system, as shown in Figure 1, computed tomography imaging system
100 include rack 110, and rack 110 has around the rotatable part 130 of system axis rotation.Rotatable part 130 has
There is the x-ray system of the x-ray source 131 and X-ray detector 132 that are oppositely arranged.
Computed tomography imaging system 100 also has examination couch 120, and when being checked, patient is on the examination couch 120
It can be pushed into along Z-direction in scanning cavity.X-ray source 131 is rotated around S axis, and detector 132 is relative to x-ray source
131 move together, and with acquired projections measurement data, these data are being used for reconstruction image later.Spiral can also be carried out to sweep
It retouches, during helical scanning, passes through patient's rotating while continuously moving with x-ray source 131 along S axis, x-ray source 131
Helical trajectory is generated relative to patient.
The computed tomography imaging system 100 can also include that control unit and image reconstruction unit (are not shown in figure
Go out), described control unit is used in scanning process according to specific scan protocols control computer computed tomography (SPECT) system 100
Each component.The initial data that described image reconstruction unit is used to be acquired according to detector 132 reconstructs image.
Embodiment one
As shown in Fig. 2, the computer tomography bearing calibration of the present embodiment includes the following steps：
Step S1 is executed, the corresponding first Air correction table of the first temperature of detector is obtained.Specifically, the spy to prestore is obtained
Survey the corresponding first Air correction table of the first temperature of device.
Step S2 is executed, when detector is in second temperature, carries out air scanning, based on air scanning and first
Air correction table obtains the second Air correction table.
In a preferred embodiment, the second temperature is higher than the first temperature；And when the detector is by the first temperature
When becoming second temperature, it can be prompted.
Specifically, air scanning is carried out, the N Reference Alignment value of second temperature is obtained, is based on the first Air correction table and benchmark
Corrected value obtains the second Air correction table.
Specifically, air scanning is carried out, the air scanning includes at least one set of scan protocols, is scanned according to the air
Obtain the second Air correction table of at least one set of scan protocols under second temperature；According to the first Air correction table and at least one set
The corresponding second Air correction table of scan protocols obtains the corresponding second Air correction table of remaining scan protocols under second temperature.
More specifically, obtaining the corresponding second Air correction table of at least one set of scan protocols subtracts corresponding first sky
The difference is added by the difference that gas checking list obtains with the corresponding first Air correction table of remaining scan protocols, is obtained
The corresponding second Air correction table of remaining scan protocols.
Step S3 is executed, the reconstruction image obtained under second temperature is corrected using the second Air correction table.
In other embodiments of the invention, following steps can also be performed：When the detector is in the first temperature,
It is corrected using the reconstruction image obtained at a temperature of the first Air correction table pair first.
The present invention also proposes a kind of computed tomography imaging system, as shown in figure 3, the computer tomography of the present embodiment
System 100 includes：
First unit 301, for obtaining the corresponding first Air correction table of the first temperature of detector.
Second unit 302 is scanned in the case where detector is in second temperature, carrying out air scanning based on the air
The second Air correction table is obtained with the first Air correction table.
Third unit 303, for being corrected to the image obtained under second temperature using the second Air correction table.
In the other embodiment of the present invention, the third unit 303 can be also used for being in the when the detector
When one temperature, it is corrected using the image obtained at a temperature of the first Air correction table pair first.
In the other embodiment of the present invention, the computed tomography imaging system 100 can also include Unit the 4th
304, for when the detector becomes second temperature from the first temperature, being prompted.
4th unit 304 specifically can by the user interface and computer of computed tomography imaging system 100 (or
Operation console) display screen or speaker realize.
Embodiment two
As shown in figure 4, the computer tomography bearing calibration of the present embodiment includes the following steps：
Step S41 is executed, the corresponding first Air correction table of the first temperature of detector is obtained.
Specifically, as described in the background section, computed tomography imaging system needs to carry out at regular intervals primary
Air scans, and scans data when not having any object in one group of visual field, and the gain of calculating detector unit is whole to obtain one
Cover standard correction gauge.This whole set of standard correction gauge includes the correction parameter of different scanning agreement at a set temperature.It obtains
Standard correction gauge can be stored in computed tomography imaging system, call when needed.
First temperature, that is, set temperature above-mentioned, the first Air correction table, that is, calibration correction above-mentioned table.
First temperature can be a temperature range, can also be a specific temperature value, in the present embodiment,
First temperature is 39 degrees Celsius.
Step S42 is executed, the temperature of detector is obtained.
Specifically, the temperature of detector can be obtained by the temperature sensor on detector matrix.
In view of detector temperature is unevenly distributed, therefore multiple temperature can be installed in the different parts of the matrix of detector
Sensor is spent, takes the mean temperature of multiple sensors as detector temperature.
In view of the sensitivity of temperature sensor, and scanning needs the regular hour, therefore can will be in a period of time
Current Temperatures of the average value for the detector temperature that temperature sensor obtains as detector.
In the present embodiment, the average value of detector (matrix) temperature temperature sensor obtained in five minutes as
The temperature of detector.
Step S43 is executed, judges the detector temperature whether more than the first temperature.
If the detector temperature is more than first temperature, then the detector temperature is second temperature, executes step
S44；The first temperature as described in being not above Current Temperatures, thens follow the steps S47.
The opportunity judged can be set according to different situations, such as can be in computerized tomography system
It unites in operational process, is once judged at regular intervals；Can also once it be judged before scanning each time starts.
Step S44 is executed then to be prompted when the detector becomes second temperature from the first temperature.
Specifically, prompting frame can be popped up in the user interface of computed tomography imaging system, remind user's detector
Temperature is above standard the set temperature (i.e. the first temperature) of checking list (i.e. the first Air correction table), if air scanning is carried out,
Or whether obtain the second Air correction table of detector at the second temperature；
User can also be reminded by modes such as sound.
In the other embodiment of the present invention, step S44 can also be omitted, and step is directly executed without prompt
S45。
Step S45 is executed, when the detector is in second temperature, air scanning is carried out, is scanned based on the air
The second Air correction table is obtained with the first Air correction table.
Specifically, air scanning is carried out, the N Reference Alignment value of second temperature is obtained, is based on the first Air correction table and benchmark
Corrected value obtains the second Air correction table.
In the present embodiment, the step S45 can specifically include following steps：
Air scanning is carried out, air scanning includes at least one set of scan protocols, according to air scanning acquisition the
The second Air correction Table A _ new of at least one set of scan protocols at a temperature of two.
One group of scan protocols include a series of sweep parameter, are directed to different scanned positions or different scanning
Situation can use different scan protocols.Usually before single pass, position that operator (doctor) can be scanned as needed
And other situations, select scan protocols.In scanning process, computed tomography imaging system can be run simultaneously according to the scan protocols
Acquire initial data.
Second Air correction Table A of at least one set of scan protocols of acquisition _ between new and the first Air correction Table A _ normal
Difference DELTA A：
Δ A=A_new-A_normal (1)
According to the first Air correction table of remaining scan protocols and the difference DELTA A, remaining is swept under acquisition second temperature
Retouch the second Air correction table of agreement：
B_new=B_normal+ Δs A；
C_new=C_normal+ Δs A； (2)
…
Z_new=Z_normal+ Δs A；
Wherein, B_normal, C_normal and Z_normal are the first Air correction table of remaining scan protocols；B_new,
C_new and Z_new is the second Air correction table of remaining scan protocols at the second temperature.
Obviously, above reckoning process depends on the establishment of a condition, that is, is more than corresponding second air of second temperature
Difference between checking list and the first Air correction table is consistent different scan protocols.This condition passes through repeatedly real
Verification is tested and tested, is to set up.
In the present embodiment, the air scanning for obtaining the second Air correction table and carrying out only includes specific one scanning association
It discusses, includes a series of sweep parameter in specific one described scan protocols, some of which sweep parameter can pass through excellent
Change；The scan protocols quantity for including in the air scanning of the second Air correction table is generated much smaller than the scan protocols for generating standard scale
Quantity, therefore the time for carrying out air scanning is shorter, can obtain the second Air correction table in a relatively short period of time, so as to
Detector gain is quickly corrected other than the first temperature.
Specific one described scan protocols are built in the program of computed tomography imaging system, when the detector temperature
Degree be second temperature when or operator confirm into row detector at the second temperature air scanning when, the computerized tomography
Imaging carries out air scanning according to the built-in specific scan protocols.
Step S46 is executed, the image obtained under second temperature is corrected using the second Air correction table.
In other embodiments of the invention, can also include the following steps：
Step S47 is executed, such as detector is in the first temperature, then uses the first Air correction table under Current Temperatures
The image of acquisition is corrected.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in computer readable storage medium, and storage is situated between
Matter can include but is not limited to：Floppy disk, CD, magneto-optic disk, ROM (read-only memory), RAM (random access memory), EPROM
(Erasable Programmable Read Only Memory EPROM), EEPROM (electrically erasable programmable read-only memory), magnetic or optical card, flash memory or
Suitable for storing other kinds of medium/machine readable media of machine-executable instruction.
In the present invention, each embodiment uses progressive literary style, the difference of emphasis description and previous embodiment each to implement
The same section of same procedure or structure with reference to the foregoing embodiments in example.
Although the invention has been described by way of example and in terms of the preferred embodiments, but it is not for limiting the present invention, any this field
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and technical content of the disclosure above to this hair
Bright technical solution makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, and according to the present invention
Technical spirit to any simple modifications, equivalents, and modifications made by above example, belong to technical solution of the present invention
Protection domain.
Claims (10)
1. a kind of computer tomography bearing calibration, which is characterized in that include the following steps：
Obtain the corresponding first Air correction table of the first temperature of detector；
When detector is in second temperature, air scanning is carried out, is obtained based on air scanning and the first Air correction table
Second Air correction table；
The image obtained under second temperature is corrected using the second Air correction table；
Wherein, the progress air scanning obtains the second Air correction table based on air scanning and the first Air correction table
Including：
Air scanning is carried out, the air scanning includes at least one set of scan protocols, and the second temperature is obtained according to air scanning
Second Air correction table of the lower at least one set of scan protocols of degree；
According to the first Air correction table and the corresponding second Air correction table of at least one set of scan protocols, obtain under second temperature
The corresponding second Air correction table of remaining scan protocols.
2. computer tomography bearing calibration as described in claim 1, which is characterized in that the second temperature is higher than first
Temperature.
3. computer tomography bearing calibration as described in claim 1, which is characterized in that the progress air scanning, base
Obtaining the second Air correction table in air scanning and the first Air correction table includes：
It obtains the corresponding second Air correction table of at least one set of scan protocols and subtracts corresponding first Air correction table and obtain
Difference, the difference is added with the corresponding first Air correction table of remaining scan protocols, obtains remaining scan protocols
Corresponding second Air correction table.
4. computer tomography bearing calibration as described in any one of claims 1 to 3, which is characterized in that when the detection
When device is in the first temperature, it is corrected using the image obtained at a temperature of the first Air correction table pair first.
5. computer tomography bearing calibration as described in any one of claims 1 to 3, which is characterized in that when the detection
When device becomes second temperature from the first temperature, prompted.
6. a kind of computed tomography imaging system, which is characterized in that including：
First unit, for obtaining the corresponding first Air correction table of the first temperature of detector；
Second unit, it is empty based on air scanning and first for when detector is in second temperature, carrying out air scanning
Gas checking list obtains the second Air correction table；
Third unit, for being corrected to the image obtained under second temperature using the second Air correction table；
Wherein, the second unit is specifically used for realizing following steps：
Air scanning is carried out, the air scanning includes at least one set of scan protocols, and the second temperature is obtained according to air scanning
Second Air correction table of the lower at least one set of scan protocols of degree；
According to the first Air correction table and the corresponding second Air correction table of at least one set of scan protocols, obtain under second temperature
The corresponding second Air correction table of remaining scan protocols.
7. computed tomography imaging system as claimed in claim 6, which is characterized in that the second temperature is higher than the first temperature
Degree.
8. computed tomography imaging system as claimed in claim 6, which is characterized in that the second unit is specifically used for realizing
Following steps：
It obtains the corresponding second Air correction table of at least one set of scan protocols and subtracts corresponding first Air correction table and obtain
Difference, the difference is added with the corresponding first Air correction table of remaining scan protocols, obtains remaining scan protocols
Corresponding second Air correction table.
9. such as claim 6 to 8 any one of them computed tomography imaging system, which is characterized in that the third unit, also
For when the detector is in the first temperature, school to be carried out using the image obtained at a temperature of the first Air correction table pair first
Just.
10. such as claim 6 to 8 any one of them computed tomography imaging system, which is characterized in that further include the 4th single
Member, for when the detector becomes second temperature from the first temperature, being prompted.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510598603.0A CN106539590B (en) | 2015-09-18 | 2015-09-18 | Computer tomography bearing calibration and computed tomography imaging system |
| PCT/CN2016/099069 WO2017045620A1 (en) | 2015-09-18 | 2016-09-14 | Computed tomography method and system |
| GB1710532.1A GB2550070B (en) | 2015-09-18 | 2016-09-14 | System and method for computer tomography |
| GB2114512.3A GB2599504B (en) | 2015-09-18 | 2016-09-14 | System and method for computer tomography |
| US15/638,610 US10722204B2 (en) | 2015-09-18 | 2017-06-30 | System and method for computer tomography |
| US16/939,161 US11191509B2 (en) | 2015-09-18 | 2020-07-27 | System and method for computed tomography |
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|---|---|---|---|
| CN201510598603.0A CN106539590B (en) | 2015-09-18 | 2015-09-18 | Computer tomography bearing calibration and computed tomography imaging system |
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| CN106539590B true CN106539590B (en) | 2018-10-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108931539B (en) * | 2017-05-25 | 2022-01-28 | 北京君和信达科技有限公司 | Detector self-checking method, device, medium and radiation type checking system |
| WO2019010648A1 (en) * | 2017-07-12 | 2019-01-17 | Shenzhen United Imaging Healthcare Co., Ltd. | System and method for air correction |
| CN108039202B (en) * | 2017-11-29 | 2021-12-10 | 上海联影医疗科技股份有限公司 | Correction table upgrading method, medical image reconstruction method and system |
| CN108324304B (en) * | 2018-01-02 | 2021-05-07 | 东软医疗系统股份有限公司 | Air correction method, device and system |
| CN108852401B (en) * | 2018-07-11 | 2022-04-15 | 上海联影医疗科技股份有限公司 | Correction table generation method and device, CT system and storage medium |
| CN109480891A (en) * | 2018-12-29 | 2019-03-19 | 上海联影医疗科技有限公司 | The generation method of computed tomograph scanner system and computed tomography images |
| CN109998578B (en) * | 2019-03-29 | 2023-07-14 | 上海联影医疗科技股份有限公司 | Method and apparatus for predicting an air correction table for computed tomography |
| CN110192887B (en) * | 2019-05-31 | 2023-06-02 | 上海联影医疗科技股份有限公司 | CT equipment scanning environment determining method, device, equipment and medium |
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