CN106539590A - 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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- CN106539590A CN106539590A CN201510598603.0A CN201510598603A CN106539590A CN 106539590 A CN106539590 A CN 106539590A CN 201510598603 A CN201510598603 A CN 201510598603A CN 106539590 A CN106539590 A CN 106539590A
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Abstract
The present invention proposes a kind of computer tomography bearing calibration and computed tomography imaging system, and the computer tomography bearing calibration is comprised 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；Using the second Air correction table to the correct image that obtains under second temperature.The present invention can in the temperature of detector not in the first temperature when, detector gain is rapidly and effectively corrected, the second Air correction table at the second temperature is produced.
Description
【Technical field】
The present invention relates to computer tomography (CT, Computed Tomography) technical field, especially
Which is related to a kind of bearing calibration of computer tomography and its system.
【Background technology】
Computer tomography (Computed Tomography, abbreviation CT) is to human body with X-ray
Specific part is scanned by certain thickness aspect, due to absorption energy of the different tissues to X-ray
Power is different, and the image of fault plane can be reconstructed with computer.
In computed tomography imaging system, detector is an important part, for obtaining through after human body
X-ray signal.In the production process of detector, it is impossible to accomplish that all pixels unit is all strict phase
With, the reflecting layer, electrooptical device between the size of pixel cell, the flatness on surface, pixel cell
Response, the noise of data acquisition electronics system etc., all of these factors taken together is integrated will cause detector
Pixel cell gain (gain) it is different.Additionally, detector gain may be changed over.If right
Detector gain is not corrected, and will produce ring-type or banding artifact.
In order to compensate the change in gain of detector difference passage and different time, need to carry out at set intervals
Primary air is scanned, the data not having in scanning one group of visual field during any object, the increasing of calculating detector unit
Benefit, so as to obtain a whole set of checking list.The checking list used in image reconstruction, compensates the gain of detector.
A whole set of standard correction gauge is included at a set temperature, the correction parameter of different scanning agreement, this set
The effect duration of standard correction gauge is longer, expired every time to regenerate a set of new standard scale.And produce a whole set of
The time of the air scanning used by standard correction gauge is also longer, more more than 30 minutes, even needs sometimes
1 to 2 hour or longer time.
Under normal circumstances, this set standard correction gauge will be used for the image reconstruction of all of scan data.But receive
Running situation, season and scanning room ambient temperature etc. affect, in system operation, detector
Temperature may occur large change, the even more than scope of application (design temperature) of calibration correction table.Work as spy
The Current Temperatures of device are surveyed more than after the design temperature upper limit, the effectiveness of standard correction gauge is reduced, it means that right
In the image that some scan, there may be artifact to occur, such case will likely affect the diagnosis of clinician.
Existing computed tomography imaging system, after detector temperature exceedes design temperature, will be prompted to user
The risk for producing artifact is had in the current situation, reduces the impact of temperature change without positive measure.
Generally, clinician needs to wait detector temperature to return in the range of design temperature, can just proceed
Scanning, this has had a strong impact on the service efficiency of computed tomograph scanner system.
It is, therefore, desirable to provide a kind of new can be carried out to detector gain beyond design temperature quickly effectively
The method of correction.
【The content of the invention】
What the present invention was solved is the standard correction gauge of existing computer tomography when more than design temperature
The problem that effectiveness is reduced.
To solve the above problems, the present invention proposes a kind of computer tomography bearing calibration, including following step
Suddenly：
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
Checking list obtains the second Air correction table；
Using the second Air correction table to the correct image that obtains under second temperature.
Alternatively, the second temperature is higher than the first temperature.
Alternatively, it is described to carry out air scanning, the is obtained based on air scanning and the first Air correction table
Two Air correction tables include：
Air scanning is carried out, the air scanning includes least one set scan protocols, scans according to the air
Obtain the second Air correction table of least one set scan protocols under second temperature；
According to the first Air correction table and the corresponding second Air correction table of least one set scan protocols, obtain
The corresponding second Air correction table of remaining scan protocols under second temperature.
Alternatively, it is described to carry out air scanning, the is obtained based on air scanning and the first Air correction table
Two Air correction tables include：
Obtain the corresponding second Air correction table of the least one set scan protocols and deduct corresponding first air
The difference that checking list is obtained, by the self-corresponding first Air correction table phase difference each with remaining scan protocols
Plus, obtain each self-corresponding second Air correction table of remaining scan protocols.
Alternatively, when the detector is in the first temperature, using the first Air correction table to the first temperature
The correct image of lower acquisition.
Alternatively, when the detector is changed into second temperature from the first temperature, pointed out.
The present invention also proposes a kind of computed tomography imaging system, including：
First module, for obtaining the corresponding first Air correction table of the first temperature of detector；
Second unit, for when detector is in second temperature, carrying out air scanning, based on the air
Scanning and the first Air correction table obtain the second Air correction table；
Unit the 3rd, for using the second Air correction table to the correct image that obtains under second temperature.
Alternatively, the second temperature is higher than the first temperature.
Alternatively, the second unit is specifically for realizing following steps：
Air scanning is carried out, the air scanning includes least one set scan protocols, scans according to the air
Obtain the second Air correction table of least one set scan protocols under second temperature；
According to the first Air correction table and the corresponding second Air correction table of least one set scan protocols, obtain
The corresponding second Air correction table of remaining scan protocols under second temperature.
Alternatively, the second unit is specifically for realizing following steps：
Obtain the corresponding second Air correction table of the least one set scan protocols and deduct corresponding first air
The difference that checking list is obtained, by the self-corresponding first Air correction table phase difference each with remaining scan protocols
Plus, obtain each self-corresponding second Air correction table of remaining scan protocols.
Alternatively, Unit the 3rd, is additionally operable to, when the detector is in the first temperature, use first
Air correction table is to the correct image that obtains at a temperature of first.
Alternatively, also including Unit the 4th, for when the detector is changed into second temperature from the first temperature,
Pointed out.
Present invention contrast prior art has following beneficial effect：
After first temperature of the temperature more than the first Air correction table of detector, can be produced by air scanning
The second Air correction table under raw second temperature, such that it is able in detector temperature not in the first temperature when, it is right
Detector gain effectively can also be corrected.
Further, in an alternative embodiment of the invention, at least for obtaining can be scanned according to air
Second Air correction table of group scan protocols, and the first Air correction table of remaining scan protocols, extrapolate
Second Air correction table of remaining scan protocols under second temperature.Air due to obtaining the second Air correction table
In scanning, only including least one set scan protocols, its number is less than the scanning association for producing the first Air correction table
Discussing quantity, therefore can obtain the second Air correction table a whole set of under second temperature within a short period of time (includes
The checking list of all scan protocols), such that it is able in detector temperature not in the first temperature when, to detector
Gain quickly can also be corrected.
【Description of the drawings】
Fig. 1 is a kind of structural representation 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 embodiment】
It is understandable to enable the above objects, features and advantages of the present invention to become apparent from, it is right below in conjunction with the accompanying drawings
The specific embodiment of the present invention is described in detail.
Fig. 1 is a kind of structural representation of computed tomography imaging system, as shown in figure 1, computerized tomography
Imaging system 100 includes frame 110, and frame 110 has around the rotatable part of system axis rotation
130.Rotatable part 130 is with the x-ray source 131 and X-ray detector 132 being oppositely arranged
X-ray system.
Computed tomography imaging system 100 also has examinating couch 120, and when being checked, patient is in the inspection
Look into.X-ray source 131 is rotated around S axles,
Detector 132 is moved together relative to x-ray source 131, and with acquired projections measurement data, these data exist
Reconstruction image is used for afterwards.Helical scanning can also be carried out, during helical scanning, by patient along
Rotate while the continuous motion of S axles and x-ray source 131, x-ray source 131 produces spiral shell relative to patient
Rotation track.
The computed tomography imaging system 100 can also include control unit and image reconstruction unit (in figure
It is not shown), described control unit is for disconnected according to specific scan protocols control computer in scanning process
Each part of layer imaging system 100.Described image reconstruction unit is original for what is gathered according to detector 132
Data reconstruction goes out image.
Embodiment one
As shown in Fig. 2 the computer tomography bearing calibration of the present embodiment is comprised the following steps：
Execution step S1, obtains the corresponding first Air correction table of the first temperature of detector.Specifically, obtain
The corresponding first Air correction table of the first temperature of detector that must be prestored.
Execution step S2, when detector is in second temperature, carries out air scanning, based on the air
Scanning and the first Air correction table obtain 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
When one temperature is changed into second temperature, can be pointed out.
Specifically, air scanning is carried out, the N Reference Alignment value of second temperature is obtained, based on the first Air correction
Table and N Reference Alignment value obtain the second Air correction table.
Specifically, air scanning is carried out, the air scanning includes least one set scan protocols, according to described
Air scanning obtains the second Air correction table of least one set scan protocols under second temperature；According to the first air
Checking list and the corresponding second Air correction table of least one set scan protocols, under acquisition second temperature, remaining is swept
Retouch the corresponding second Air correction table of agreement.
More specifically, obtain the corresponding second Air correction table of the least one set scan protocols deduct it is corresponding
The difference that first Air correction table is obtained, by the difference and each self-corresponding first air of remaining scan protocols
Checking list is added, and obtains each self-corresponding second Air correction table of remaining scan protocols.
Execution step S3, carries out school to the reconstruction image obtained under second temperature using the second Air correction table
Just.
In other embodiments of the invention, following steps be can also carry out：When the detector is in first
During temperature, the reconstruction image obtained at a temperature of first is corrected using the first Air correction table.
The present invention also proposes a kind of computed tomography imaging system, as shown in figure 3, the computer of the present embodiment
Computed tomography (SPECT) system 100 includes：
First module 301, for obtaining the corresponding first Air correction table of the first temperature of detector.
Second unit 302, carries out air scanning, based on described in detector under second temperature
Air is scanned and the first Air correction table obtains the second Air correction table.
3rd unit 303, for carrying out school to the image obtained under second temperature using the second Air correction table
Just.
In the other embodiment of the present invention, the 3rd unit 303 is can be also used for when the detector
In the first temperature when, using the first Air correction table to the correct image that obtains at a temperature of first.
In the other embodiment of the present invention, the computed tomography imaging system 100 can also include the
Four units 304, for when the detector is changed into second temperature from the first temperature, being pointed out.
4th unit 304 can specifically pass through the user interface and meter of computed tomography imaging system 100
The display screen of calculation machine (or operating board) or audio amplifier are realized.
Embodiment two
As shown in figure 4, the computer tomography bearing calibration of the present embodiment is comprised the following steps：
Execution step S41, obtains the corresponding first Air correction table of the first temperature of detector.
Specifically, as described in the background section, computed tomography imaging system need at set intervals into
Row primary air is scanned, the data not having in scanning one group of visual field during any object, calculating detector unit
Gain, so as to obtain a whole set of standard correction gauge.This whole set of standard correction gauge is included at a set temperature,
The correction parameter of different scanning agreement.The standard correction gauge of acquisition can be stored in computed tomography imaging system,
Call when needed.
First temperature is aforesaid design temperature, and the first Air correction table is aforesaid calibration correction
Table.
First temperature can be a temperature range, or a specific temperature value, in this reality
Apply in example, first temperature is 39 degrees Celsius.
Execution step S42, obtains the temperature of detector.
Specifically, the temperature of detector can be obtained by the temperature sensor on detector matrix.
In view of detector temperature skewness, therefore can install in the different parts of the matrix of detector
Multiple temperature sensors, take 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 be by one section
Current Temperatures of the meansigma methodss of the detector temperature that temperature sensor is obtained as detector in time.
In the present embodiment, detector (matrix) temperature for temperature sensor being obtained in five minutes it is flat
Temperature of the average as detector.
Whether execution step S43, judge the detector temperature more than the first temperature.
The first temperature as described in the detector temperature exceedes, then the detector temperature is second temperature, is held
Row step S44；As Current Temperatures are not above first temperature, then execution step S47.
The opportunity for being judged, can be set according to different situations, for example can be in computer
In tomographic systems running, once judged at set intervals；Can also open in scanning each time
Once judged before beginning.
Execution step S44, when the detector is changed into second temperature from the first temperature, is then pointed out.
Specifically, prompting frame can be ejected in the user interface of computed tomography imaging system, user is reminded
Detector temperature is above standard the design temperature (i.e. the first temperature) of checking list (i.e. the first Air correction table),
Air scanning whether is carried out, or whether obtains detector the second Air correction table 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 do not pointed out and directly held
Row step S45.
Execution step S45, when the detector is in second temperature, carries out air scanning, based on described
Air is scanned and the first Air correction table obtains the second Air correction table.
Specifically, air scanning is carried out, the N Reference Alignment value of second temperature is obtained, based on the first Air correction
Table and N Reference Alignment value obtain the second Air correction table.
In the present embodiment, step S45 specifically may comprise steps of：
Air scanning is carried out, the air scanning includes least one set scan protocols, scans according to the air
Obtain the second Air correction Table A _ new of least one set scan protocols under second temperature.
One group of scan protocols include a series of sweep parameter, are directed to different scanned positions or difference
Scanning situation can use different scan protocols.Generally before single pass, operator (doctor) meeting
The position scanned as needed and other situations, select scan protocols.In scanning process, computerized tomography
Imaging system can be run according to the scan protocols and gather initial data.
Obtain the second Air correction Table A _ new and the first Air correction table of least one set scan protocols
Difference DELTA A between A_normal：
Δ A=A_new-A_normal (1)
According to the first Air correction table and difference DELTA A of remaining scan protocols, obtain under second temperature
Second Air correction table of remaining scan protocols：
B_new=B_normal+ Δ A；
C_new=C_normal+ Δ A； (2)
…
Z_new=Z_normal+ Δ A；
Wherein, B_normal, C_normal and Z_normal are the first air school of remaining scan protocols
Positive table；B_new, C_new and Z_new are remaining scan protocols the second Air correction at the second temperature
Table.
Obviously, the reckoning process of the above depends on the establishment of a condition, i.e., and corresponding more than second temperature
Difference between two Air correction tables and the first Air correction table is consistent for different scan protocols.This
One condition passes through many experiments and test checking, 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
Scan protocols, include a series of sweep parameter, some of which in described specific one scan protocols
Sweep parameter can be through optimization；The scan protocols quantity included in the air scanning for producing the second Air correction table
Much smaller than the scan protocols quantity for producing standard scale, therefore it is shorter to carry out the time of air scanning, can compared with
The second Air correction table is obtained in the short time, such that it is able to carry out to detector gain beyond the first temperature
It is quick to correct.
Described specific one scan protocols are built in the program of computed tomography imaging system, when the spy
When to survey device temperature be second temperature, or operator's air for confirming into row detector at the second temperature is when scanning,
The computer tomography carries out air scanning according to the built-in specific scan protocols.
Execution step S46, using the second Air correction table to the correct image that obtains under second temperature.
In other embodiments of the invention, can also comprise the following steps：
Execution step S47, as the detector is in the first temperature, then using the first Air correction table to working as
The correct image obtained at front temperature.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment
Suddenly can be by program to instruct the hardware of correlation to complete, the program can be stored in computer-readable and deposit
In storage media, storage medium can be including but not limited to：Floppy disk, CD, magneto-optic disk, ROM are (read-only to deposit
Reservoir), RAM (random access memory), EPROM (Erasable Programmable Read Only Memory EPROM), EEPROM
(Electrically Erasable Read Only Memory), magnetic or optical card, flash memory or be suitable to store machine can perform
Other kinds of medium/the machine readable media of instruction.
In the present invention, each embodiment adopts the difference of laddering literary style, emphasis description and previous embodiment,
Same procedure or structure in each embodiment same section with reference to the foregoing embodiments.
Although the present invention disclosed as above with preferred embodiment, its be not for limiting the present invention, it is any
Those skilled in the art without departing from the spirit and scope of the present invention, the method that may be by the disclosure above
Possible variation and modification are made to technical solution of the present invention with technology contents, therefore, it is every without departing from this
The content of bright technical scheme, any simple modification above example made according to the technical spirit of the present invention,
Equivalent variations and modification, belong to the protection domain of technical solution of the present invention.
Claims (12)
1. a kind of computer tomography bearing calibration, it is characterised in that comprise 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
One Air correction table obtains the second Air correction table；
Using the second Air correction table to the correct image that obtains under second temperature.
2. computer tomography bearing calibration as claimed in claim 1, it is characterised in that described
Two temperature are higher than the first temperature.
3. computer tomography bearing calibration as claimed in claim 1, it is characterised in that it is described enter
Row air is scanned, and obtains the second Air correction based on air scanning and the first Air correction table
Table includes：
Air scanning is carried out, the air scanning includes least one set scan protocols, according to the air
Scanning obtains the second Air correction table of least one set scan protocols under second temperature；
According to the first Air correction table and the corresponding second Air correction table of least one set scan protocols,
Obtain the corresponding second Air correction table of remaining scan protocols under second temperature.
4. computer tomography bearing calibration as claimed in claim 3, it is characterised in that it is described enter
Row air is scanned, and obtains the second Air correction based on air scanning and the first Air correction table
Table includes：
Obtain the corresponding second Air correction table of the least one set scan protocols and deduct corresponding first
The difference that Air correction table is obtained, by the difference and remaining scan protocols each self-corresponding first
Air correction table is added, and obtains each self-corresponding second Air correction table of remaining scan protocols.
5. the computer tomography bearing calibration as described in any one of Claims 1-4, its feature exist
In when the detector is in the first temperature, using the first Air correction table to the first temperature
The correct image of lower acquisition.
6. the computer tomography bearing calibration as described in any one of Claims 1-4, its feature exist
In when the detector is changed into second temperature from the first temperature, being pointed out.
7. a kind of computed tomography imaging system, it is characterised in that include：
First module, for obtaining the corresponding first Air correction table of the first temperature of detector；
Second unit, for when detector is in second temperature, carrying out air scanning, based on described
Air is scanned and the first Air correction table obtains the second Air correction table；
Unit the 3rd, for carrying out school to the image obtained under second temperature using the second Air correction table
Just.
8. computed tomography imaging system as claimed in claim 7, it is characterised in that described second is warm
Degree is higher than the first temperature.
9. computed tomography imaging system as claimed in claim 7, it is characterised in that described second is single
Unit is specifically for realizing following steps：
Air scanning is carried out, the air scanning includes least one set scan protocols, according to the air
Scanning obtains the second Air correction table of least one set scan protocols under second temperature；
According to the first Air correction table and the corresponding second Air correction table of least one set scan protocols,
Obtain the corresponding second Air correction table of remaining scan protocols under second temperature.
10. computed tomography imaging system as claimed in claim 9, it is characterised in that described second
Unit is specifically for realizing following steps：
Obtain the corresponding second Air correction table of the least one set scan protocols and deduct corresponding first
The difference that Air correction table is obtained, by the difference and remaining scan protocols each self-corresponding first
Air correction table is added, and obtains each self-corresponding second Air correction table of remaining scan protocols.
11. computed tomography imaging systems as described in any one of claim 7 to 10, it is characterised in that
Unit the 3rd, is additionally operable to when the detector is in the first temperature, using the first air
Checking list is to the correct image that obtains at a temperature of first.
12. computed tomography imaging systems as described in any one of claim 7 to 10, it is characterised in that
Also include Unit the 4th, for when the detector is changed into second temperature from the first temperature, entering
Row prompting.
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 |
| GB1710532.1A GB2550070B (en) | 2015-09-18 | 2016-09-14 | System and method for computer tomography |
| PCT/CN2016/099069 WO2017045620A1 (en) | 2015-09-18 | 2016-09-14 | Computed tomography method and system |
| 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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| 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 |
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| CN106539590A true CN106539590A (en) | 2017-03-29 |
| CN106539590B CN106539590B (en) | 2018-10-30 |
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| CN108324304A (en) * | 2018-01-02 | 2018-07-27 | 沈阳东软医疗系统有限公司 | A kind of method, apparatus and system of Air correction |
| CN108852401A (en) * | 2018-07-11 | 2018-11-23 | 上海联影医疗科技有限公司 | A kind of correction table creation method, device, CT system and storage medium |
| 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 |
| CN109998578A (en) * | 2019-03-29 | 2019-07-12 | 上海联影医疗科技有限公司 | The method and apparatus for predicting the Air correction table of computer tomography |
| CN110192887A (en) * | 2019-05-31 | 2019-09-03 | 上海联影医疗科技有限公司 | CT equipment scanning circumstance determines method, apparatus, equipment and medium |
| 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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