CN109480890A - Collimator bearing calibration, device, CT system and storage medium - Google Patents
Collimator bearing calibration, device, CT system and storage medium Download PDFInfo
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Abstract
The embodiment of the invention discloses a kind of collimator bearing calibration, device, CT system and storage mediums.This method comprises: obtaining the corresponding default code value of current collimating slit；When obtaining multiple code values that the collimator is located in the neighbouring setting range of the default code value respectively, corresponding scan data, and according to the corresponding scan data of the multiple code value, the default code value is corrected.Solves the machine error as brought by the manufacture craft of collimator and the installation site of bulb, collimator and detector in the prior art by adopting the above technical scheme, cause during rotation switches collimating slit, it generally occurs within the center of collimating slit and the maximal rays intensity locations of X-ray that detector detects exists and deviate, and then the technical issues of affecting the image quality of CT image, so that being compensated when using CT system to above-mentioned machine error, and then improve the image quality of CT image.
Description
Technical field
The present embodiments relate to Medical Instruments technical field more particularly to a kind of collimator bearing calibration, device, CT systems
System and storage medium.
Background technique
CT scan (Computed Tomography, the CT) imaging clinically used is according to human body
Different tissues or organ are different to the attenuation degree of X-ray, and obtain X-ray using x-ray bombardment human body and respectively organize through human body
Image after decaying, and utilize images as the reference foundation of medical diagnosis on disease.
In CT imaging process, in order to reduce the interference of scattered rays, reducing the radiological dose of patient and improve CT image
Image quality, it will usually collimator is set between bulb and detector, is carried out to the X-ray that is emitted bulb quasi-
Directly.Wherein, collimator is provided with the collimating slit of multiple and different specifications, therefore can pass through the rotation of the collimating slit to different size
Switching, and then the X-ray emitted bulb carries out different degrees of collimation.
However, the distribution due to each collimating slit in same collimator is different, specification is different, while being limited to the system of collimator
Make the installation site of technique and installation site and bulb and detector, so that during rotation switches collimating slit, usually
There are the feelings centainly deviateed in the maximal rays intensity locations for the X-ray that the center and detector for collimating slit occur detect
Condition, and then affect the image quality of CT image.
Summary of the invention
The present invention provides a kind of collimator bearing calibration, device, CT system and storage medium, accidentally with the machinery to CT system
Difference is compensated, and then improves the image quality of CT image.
In a first aspect, being applied to CT system, this method packet the embodiment of the invention provides a kind of collimator bearing calibration
It includes:
Obtain the corresponding default code value of current collimating slit；
It is corresponding when obtaining multiple code values that the collimator is located in the neighbouring setting range of the default code value respectively
Scan data, and according to the corresponding scan data of the multiple code value, the default code value is corrected.
Second aspect, the embodiment of the invention also provides a kind of collimator means for correctings, are configured at CT system, the device packet
It includes:
Default code value obtains module, for obtaining the corresponding default code value of current collimating slit；
Default code value correction module, is located near the default code value in setting range for obtaining the collimator respectively
Multiple code values when, corresponding scan data, and according to the corresponding scan data of the multiple code value, to the default code value
It is corrected.
The third aspect, the embodiment of the invention also provides a kind of CT systems, including bulb, collimator and detector, also wrap
It includes:
One or more processors；
Storage device, for storing one or more programs；
One or more of programs are executed by one or more of processors, so that one or more of processors
Realize a kind of collimator bearing calibration as provided by first aspect embodiment.
Fourth aspect, the embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer
Program realizes a kind of collimator bearing calibration as provided by first aspect embodiment when the program is executed by processor.
The embodiment of the present invention obtains collimator to be respectively located at this pre- by obtaining the corresponding default code value of current collimating slit
If code value nearby multiple code values in setting range when, corresponding scan data；According to the corresponding scan data of multiple code values,
Default code value is corrected.Solve by adopting the above technical scheme in the prior art due to the manufacture craft of collimator and
Machine error brought by the installation site of bulb, collimator and detector causes to lead to during rotation switches collimating slit
Often there is the center of collimating slit and there is deviation, Jin Erying with the maximal rays intensity locations of X-ray that detector detects
The technical issues of having rung the image quality of CT image, so that being compensated when using CT system to above-mentioned machine error, in turn
Improve the image quality of CT image.
Detailed description of the invention
Fig. 1 is the flow chart of one of embodiment of the present invention one collimator bearing calibration；
Fig. 2 is the flow chart of one of embodiment of the present invention two collimator bearing calibration；
Fig. 3 is the structure chart of one of embodiment of the present invention three collimator means for correcting；
Fig. 4 is the structural schematic diagram of one of the embodiment of the present invention four CT system.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is the flow chart of one of embodiment of the present invention one collimator bearing calibration, and the embodiment of the present invention is suitable for
Using the case where compensating to the machine error of CT system.This method is executed by collimator means for correcting, the device by
Software and or hardware realization, and be configured in CT system.Wherein, which, which is equipped with, is provided with multiple fixed collimating slits
Collimator realizes the adjusting of collimating slit width by the switching of different collimating slits.
A kind of collimator bearing calibration as shown in Figure 1, comprising:
S110, the corresponding default code value of current collimating slit is obtained.
Wherein, when default code value be can be understood as using current collimating slit, detector can theoretically receive maximum and penetrate
Line intensity is the motor code value of corresponding collimator driving motor.Wherein, default code value can be stored in advance in CT system sheet
Ground, or storage equipment associated with CT system or cloud.
S120, obtain respectively the collimator be located at the default code value nearby multiple code values in setting range when, institute
Corresponding scan data, and according to the corresponding scan data of the multiple code value, the default code value is corrected.
Illustratively, according to the selection rule of setting, multiple code values near default code value in setting range are determined.Example
Such as, default code value section can be formed according to setting range near default code value, according to setting sample frequency to default code value area
Between sampled to obtain multiple code values.Wherein, setting sample frequency can be fixed value, can also be according to present sample number
And remaining sampling interval length, the variable value of dynamic regulation.
Illustratively, after determining multiple code values near default code value in setting range, different code value institutes are obtained respectively
Corresponding scan data；The transmitted intensity that the corresponding detector of each code value receives is obtained according to the scan data；Determine institute
It states transmitted intensity and meets target code value corresponding when setting intensity threshold, as the default code value after correction.Wherein, setting is strong
It is strong that degree threshold value can estimate determining ray according to the hardware parameters such as bulb, collimator and detector array and installation site etc.
Spend target value；Can also according to get do not block bulb ray when, ray determined by corresponding each history transmitted intensity is strong
Spend target value；It can also be corresponding each according to the different code values in setting range near the corresponding default code value of current collimating slit
Transmitted intensity target value determined by transmitted intensity.
Preferably, corresponding target code value when transmitted intensity meets setting intensity threshold is determined, as default after correction
Code value, corresponding target code value when including determining transmitted intensity highest, as the default code value after correction.
Optionally, it determines target code value corresponding when transmitted intensity meets setting intensity threshold, may is that according to each code
It is worth corresponding transmitted intensity fitting transmitted intensity curve；Whether transmitted intensity, which meets, in determining be fitted transmitted intensity curve sets
Determine intensity threshold；If so, the object code according to corresponding at least one transmitted intensity corresponding when meeting given threshold intensity
Value, the default code value after determining correction.
Illustratively, the object code according to corresponding at least one transmitted intensity corresponding when meeting given threshold intensity
Value, determine correction after default code value, can be selection it is any meet target code value corresponding when given threshold intensity, as
Default code value after correction；Alternatively, determining first meets corresponding target code value when given threshold intensity, after correction
Default code value；Alternatively, corresponding target code value when transmitted intensity highest when meeting given threshold intensity is determined, after correction
Default code value；Alternatively, the weighted mean for meeting each target code value corresponding when given threshold intensity is determined, after correction
Default code value.
Or it is optional, it determines target code value corresponding when transmitted intensity meets setting intensity threshold, may is that directly
Compare transmitted intensity corresponding to each code value, and determine target code value corresponding to maximal rays intensity, as pre- after correction
If code value.
It should be noted that scan data corresponding to acquired different code values can be stored in advance in CT system sheet
Ground, CT system associated storage equipment or cloud, or scan operation can also be first carried out and obtain scan data, and swept to what is obtained
Data are retouched to be obtained.
Illustratively, it is located at multiple code values near the default code value in setting range obtaining the collimator respectively
When, before corresponding scan data, further includes: control the collimating slit respectively and be moved to the default code value and nearby set model
Interior multiple code values are enclosed, and scan operation is executed to body to be detected, obtain scan data corresponding to the multiple code value.Its
In, body to be detected can be air dielectric or needle mould etc..
It is understood that scan data obtain and can basis according to the process that scan data obtains transmitted intensity
Single code value carries out one by one, can also carry out stage by stage for each code value；Correspondingly, determining before multiple code values acquisitions
Journey can be and predefine before scan data obtains and obtains transmitted intensity according to scan data, can also obtain
After transmitted intensity, it is determined according to obtained transmitted intensity.
Optionally, according to code value selection rule, multiple code values near default code value in setting range are determined；It obtains each
Scan data corresponding to code value；Determine transmitted intensity received by the corresponding detector of each scan data；Determine that ray is strong
Corresponding target code value when highest is spent, as the default code value after correction.Wherein, code value selection rule can be it is average choose,
Randomly select or chosen according to probability density etc..For example, near the determining default code value in setting range, it is true according to setting step-length
Fixed different code values；Alternatively, determining average step length according to setting code value quantity, and different code values etc. are determined according to average step length.Its
In, setting range, setting step-length and setting code value quantity by technical staff as needed or empirical value set.
Or it is optional, a current code value is selected near code value in setting range presetting；It is corresponding to obtain current code value
Current Scan data；By the corresponding received transmitted intensity of detector institute of Current Scan data ray corresponding with reference code value
Intensity is compared, and is selected the corresponding code value of a transmitted intensity to update according to comparison result and referred to code value；Select default code value
Other code values in neighbouring setting range continue the acquisition operation of Current Scan data, until meeting as current code value
Stop condition.Wherein, stop condition can be acquired current code value and reach setting quantity, or traverse near default code value
Identified multiple code values or acquired code value are evenly distributed near default code value in setting range in setting range, or
Current reference code value and the previous difference with reference to code value are less than default code value threshold value etc..Wherein, set quantity, setting range and
Default code value threshold value is as needed by technical staff or empirical value is set.
It is understood that can be repeated for same collimating slit true to improve the accuracy of the default code value of correction
Fixed multiple target code values, and using the average value of each target code value or weighted mean as the default code value after correction.For convenience
The reading of default code value after correction, can also be by default code value and the corresponding collimating slit associated storage after correction.
Due in same collimator there are multiple and different collimating slits, the default code value to current collimating slit into
After row correction, further includes: other collimating slits in selection collimator continue to execute default code value and obtain operation, until completing
Correction to the default code value of each collimating slit in the collimator.
It certainly, can also be according to having corrected collimation in order to simplify the correction course of the corresponding default code value of other collimating slits
Default code value after the geometric parameter of seam and corresponding correction is corrected the default code value for not correcting collimating slit.Wherein,
Having corrected collimating slit and not corrected collimating slit can be located at in collimator, can also be located in different collimators.
It, can be according to having corrected the collimating slit width of collimating slit, not corrected collimation when illustratively, in same collimator
The collimating slit width of seam and corrected collimating slit with do not correct in the distance between collimating slit at least one of, in conjunction with school
Default code value after the corresponding correction of positive collimating slit, is corrected the default code value for not correcting collimating slit.
When illustratively, in different collimators, can according to the specifications parameter or empirical value of collimator, will with corrected
The corresponding default code value of the consistent reference collimating slit of collimating slit is corrected；According to the lumped parameter of reference collimating slit with correspondence
Correction after default code value, the default code value for not correcting collimating slit in same collimator is corrected.
It is understood that due to hardware each in CT system loss or due to bulb in CT system, collimator and
Detector array maintenance or replacement when, cause the machine error of CT system itself to change, thus above situation be required into
The default code value of row redefines, or further updates storage, so that default code value and current CT system after correction
System matches.
The embodiment of the present invention obtains collimator to be respectively located at this pre- by obtaining the corresponding default code value of current collimating slit
If code value nearby multiple code values in setting range when, corresponding scan data；According to the corresponding scan data of multiple code values,
Default code value is corrected.Solve by adopting the above technical scheme in the prior art due to the manufacture craft of collimator and
Machine error brought by the installation site of bulb, collimator and detector causes to lead to during rotation switches collimating slit
Often there is the center of collimating slit and there is deviation, Jin Erying with the maximal rays intensity locations of X-ray that detector detects
The technical issues of having rung the image quality of CT image, so that being compensated when using CT system to above-mentioned machine error, in turn
Improve the image quality of CT image.
Embodiment two
Fig. 2 is the flow chart of one of embodiment of the present invention two collimator bearing calibration, and the embodiment of the present invention is above-mentioned
Subdivision optimization has been carried out on the basis of the technical solution of each embodiment.
Further, by operation, " obtaining the collimator respectively, to be located at the default code value more in setting range nearby
When a code value, corresponding scan data；According to the corresponding scan data of the multiple code value, school is carried out to the default code value
It just " is refined as " according to the reference deviation of the default code value and the collimating slit, determining and referring to code value section；Obtain institute
It states collimating slit and is located at scan data corresponding when the end value with reference to code value section, and distinguished according to the scan data true
The fixed corresponding transmitted intensity of two end values；Adjustable reference code value is moved to fixed reference code value direction, and after use movement
Code value as adjustable reference code value, update and described refer to code value section；Wherein, the fixed reference code value be transmitted intensity compared with
Big end value, the adjustable reference code value are the lesser end value of transmitted intensity；It returns and executes scan data acquisition operation, until institute
The difference for stating adjustable reference code value and fixed reference code value is less than given threshold；According to the end value in reference code value section, school is determined
Default code value after just " determines the default code value after correcting in a manner of by repeatedly reducing with reference to code value section, improves school
The determination precision of default code value after just.
A kind of collimator bearing calibration as shown in Figure 2, comprising:
S210, the corresponding default code value of current collimating slit is obtained.
S220, according to the reference deviation of the default code value and the collimating slit, determine and refer to code value section.
Wherein, it can be determined based on experience value by technical staff with reference to deviation, can also be the theoretical maximum of CT system
Installation error.
Specifically, adding and subtracting according to default code value with reference to deviation, two end values with reference to code value section are obtained.
S230, it obtains the collimating slit and is located at scan data corresponding when the end value with reference to code value section, and root
The corresponding transmitted intensity of two end values is determined respectively according to the scan data.Wherein, fixed reference code value be transmitted intensity compared with
Big end value, adjustable reference code value are the lesser end value of transmitted intensity.
Collimating slit is directly acquired respectively is located at scan data corresponding when the end value with reference to code value section；Or it controls respectively
Collimating slit processed is moved to the position with reference to corresponding to the end value in code value section, executes scan operation and obtains the corresponding scanning number of each end value
According to, and the corresponding received transmitted intensity of detector institute of each end value is obtained according to each scan data.
It should be noted that since fixed reference code value and adjustable reference code value are based on the corresponding transmitted intensity of each code value
Size determines that therefore, the relative size of both fixed reference code value and adjustable reference code value code value is simultaneously not fixed.
S240, judge that the difference of adjustable reference code value and fixed reference code value is less than given threshold；If it is not, then executing
S250；If so, executing S260.
Wherein, given threshold by technical staff according to actual needs or empirical value is determined.Such as subject to can be set
Numerical value corresponding to the adjustable minimum unit of driving motor of straight device, or it is directly disposed as 0.
S250, adjustable reference code value is moved to fixed reference code value direction, and using the code value after movement as adjustable
With reference to code value, update described with reference to code value section；It returns and executes S230.
Optionally, adjustable reference code value is mobile to fixed reference code value direction, it may is that acquisition is default and adjust step-length；
Adjustable preset with reference to code value to mobile this in fixed reference code value direction is adjusted into step-length.
Or it is optional, adjustable reference code value is mobile to fixed reference code value direction, it may is that and determine with reference to code value area
Between siding-to-siding block length, and combine setting code value quantity, determine step-length to be regulated；By the adjustable code value that refers to fixed reference code value
Move the step-length to be regulated in direction.
Or it is optional, adjustable reference code value is mobile to fixed reference code value direction, it may is that and determine with reference to code value area
Between siding-to-siding block length, and according to it is default adjust than and siding-to-siding block length product, determine step-length to be regulated；By adjustable reference code value to
Move the step-length to be regulated in fixed reference code value direction.
Specifically, corresponding reduce refers to code value section, after mobile adjustable reference code value so as to the reference code value after diminution
In section, the search operation of corresponding target code value when transmitted intensity maximum is executed.Therefore, it is also desirable to using the code value after movement
It is described with reference to code value section to update as adjustable reference code value.
It is understood that in order to accelerate the contraction efficiency with reference to code value section, and then improve the correction to default code value
Efficiency, when the difference between adjustable reference code value and the corresponding transmitted intensity of fixed reference code value is less than setting intensity threshold,
Can also be mobile to fixed reference code value direction by adjustable reference code value simultaneously, and by fixed reference code value to adjustable reference code
Value direction is mobile, and using the adjustable reference code value after movement and the fixed reference code value after movement, updates and refer to code value section.
Wherein, setting intensity threshold is set based on experience value by technical staff.
Specifically, the mode that fixed reference code value is mobile to adjustable reference code value direction, reference can be made to above-mentioned by adjustable ginseng
The code value mode mobile to fixed reference code value direction is examined, details are not described herein.It should be noted that fixed reference code value into
Step-length to be regulated when row is mobile can be the same or different with the step-length to be regulated when moving to adjustable reference code value,
Any restriction is not done herein.In addition, movement when fixed reference code value is carried out movement and moved to adjustable reference code value
Mode may be the same or different.
S260, the default code value according to the end value in reference code value section, after determining correction.
Specifically, showing transmitted intensity most when the difference of adjustable reference code value and fixed reference code value is less than given threshold
Corresponding target code value is between adjustable reference code value and fixed reference code value when big.It therefore, can be according to adjustable reference
Code value and/or fixed reference code value carry out the determination of target code value, using determining target code value as the code presupposition after correction
Value.
Illustratively, according to adjustable reference code value and/or fixed reference code value, the determination of target code value, Ke Yizhi are carried out
One in determining adjustable reference code value and fixed reference code value is met, as target code value；It can also be according to adjustable reference code value
With the weighted mean of both fixed reference code values, target code value is determined.
The embodiment of the present invention by being refined to the corrected scheme of default code value, with specific reference to default code value and
The reference deviation of collimating slit, which determines, refers to code value section；It is corresponding when obtaining collimating slit positioned at the end value for referring to code value section
Scan data, and the corresponding transmitted intensity of two end values is determined according to scan data respectively, and determine that transmitted intensity is biggish
End value is fixed reference code value, determines that the lesser end value of transmitted intensity is adjustable reference code value；By adjustable reference code value to fixation
It is mobile with reference to code value direction, and update as adjustable reference code value using the code value after mobile and refer to code value section, and according to more
Reference code value section after new re-executes scan data and obtains operation, sets until the difference of reference code value section endpoints thereof is less than
Determine threshold value；The default code value after correction is determined according to the end value in reference code value section.Above-mentioned technical proposal is big according to transmitted intensity
Small mode is adjusted with reference to the adjustable reference code value in code value section, to reduce the area in the reference code value section comprising target code value
Between length, and according to finally determine reference code value section, determine target code value as correct after default code value, improve school
The determination precision of default code value after just.
Embodiment three
Fig. 3 is the structure chart of one of embodiment of the present invention three collimator means for correcting, and the embodiment of the present invention is suitable for
The case where compensating to the machine error of CT system is being used, which is configured at CT system by software and or hardware realization
In system.Wherein, which is equipped with the collimator for being provided with multiple fixed collimating slits, is realized by the switching of different collimating slits
The adjusting of collimating slit width.
A kind of collimator means for correcting as shown in Figure 3, including default code value obtain module 310 and the correction of default code value
Module 320.
Wherein, it presets code value and obtains module 310, for obtaining the corresponding default code value of current collimating slit；
Default code value correction module 320 is located near the default code value for obtaining the collimator respectively and sets model
When enclosing interior multiple code values, corresponding scan data, and according to the corresponding scan data of the multiple code value, to described default
Code value is corrected.
The embodiment of the present invention obtains module by default code value and obtains the corresponding default code value of current collimating slit, by default
When code value correction module obtains multiple code values that collimator is located in the default neighbouring setting range of code value respectively, corresponding is swept
Data are retouched, and according to the corresponding scan data of multiple code values, default code value is corrected.It solves by adopting the above technical scheme
The machinery as brought by the manufacture craft of collimator and the installation site of bulb, collimator and detector in the prior art
Error causes the X for generally occurring within the center of collimating slit during rotation switches collimating slit and detector detects to penetrate
The technical issues of maximal rays intensity locations of line are in the presence of deviateing, and then affecting the image quality of CT image, so that using
Above-mentioned machine error is compensated when CT system, and then improves the image quality of CT image.
Further, the default code value correction module 320, it is right according to the corresponding scan data of the multiple code value
When the default code value is corrected, it is specifically used for:
The transmitted intensity that the corresponding detector of each code value receives is obtained according to the scan data；
Target code value corresponding when the transmitted intensity meets setting intensity threshold is determined, as the code presupposition after correction
Value.
Further, the default code value correction module 320, comprising:
With reference to code value interval determination unit, for the reference deviation according to the default code value and the collimating slit,
It determines and refers to code value section；
Transmitted intensity determination unit, it is corresponding when the collimating slit is located at the end value with reference to code value section for obtaining
Scan data, and according to the scan data respectively determine the corresponding transmitted intensity of two end values；
With reference to code value section updating unit, for adjustable reference code value is mobile to fixed reference code value direction, and use
Code value after movement updates described with reference to code value section as adjustable reference code value；Wherein, the fixed reference code value is ray
The biggish end value of intensity, the adjustable reference code value are the lesser end value of transmitted intensity；
Cycling element executes scan data acquisition operation for returning, until the adjustable reference code value and fixed reference
The difference of code value is less than given threshold.
Further, described to refer to code value section updating unit, execute it is described by adjustable reference code value to fixed reference
Before code value direction is mobile, it is also used to:
It determines the siding-to-siding block length with reference to code value section, and is adjusted according to default than the product with the siding-to-siding block length,
Determine step-length to be regulated；
Correspondingly, described refer to code value section updating unit, executing adjustable reference code value to fixed reference code value side
To when movement, it is specifically used for:
The adjustable reference code value is moved into the step-length to be regulated to fixed reference code value direction.
Further, which further includes that scan data obtains module, is used for:
It is corresponding when obtaining the collimator respectively and being located at multiple code values near the default code value in setting range
Scan data before, control the collimating slit respectively and be moved to multiple code values of the default code value nearby in setting range,
And scan operation is executed to body to be detected, obtain scan data corresponding to the multiple code value.
Further, which further includes that loop module is used for:
According to the corresponding scan data of the multiple code value, after being corrected to the default code value, selection is collimated
Other collimating slits in device continue to execute default code value and obtain operation, until completing to each collimating slit in the collimator
The correction of default code value.
Further, which further includes being associated with correction module, being used for:
According to the default code value after the geometric parameter and corresponding correction for having corrected collimating slit, to not correcting collimating slit
Default code value is corrected.
Further, which further includes that associated storage module is used for:
After being corrected to the default code value, the default code value after correction is deposited with the association of corresponding collimating slit
Storage.
Collimator bearing calibration provided by any embodiment of the invention can be performed in above-mentioned collimator means for correcting, has and holds
The corresponding functional module of row collimator bearing calibration and beneficial effect.
Example IV
Fig. 4 is the structural schematic diagram of one of the embodiment of the present invention four CT system, which includes bulb 410, standard
Straight device 420, detector 430, further includes:
One or more processors 440；
Storage device 450, for storing one or more programs.
In Fig. 4 by taking a processor 440 as an example, processor 440 in the CT system respectively with bulb 410, collimator 420
And detector 430 is connected by bus or other modes, processor 440 and storage device 450 are also by bus or its other party
Formula connection.In Fig. 4 for being connected by bus.
In the present embodiment, the processor 440 in CT system can obtain current in collimator 420 from storage device 450
The corresponding default code value of used collimating slit；Processor 440 can also obtain collimator 420 respectively and be located near default code value
When multiple code values in setting range, corresponding scan data, and according to the corresponding scan data of the multiple code value, to institute
Default code value is stated to be corrected.
Storage device 450 in the CT system is used as a kind of computer readable storage medium, can be used for storing one or more
A program, described program can be software program, computer executable program and module, such as collimator in the embodiment of the present invention
Corresponding program instruction/the module of bearing calibration is (for example, the attached code value shown in Fig. 3 that sets obtains module 310 and the correction of default code value
Module 320).Software program, instruction and the module that processor 440 is stored in storage device 450 by operation, thereby executing
The various function application and data processing of CT system, i.e. collimator bearing calibration in realization above method embodiment.
Storage device 450 may include storing program area and storage data area, wherein storing program area can store operation system
Application program needed for system, at least one function；It storage data area can the (collimating slit pair in such as above-described embodiment such as storing data
Default code value, multiple code values in the neighbouring setting range of default code value and the corresponding scan data of multiple code values for answering etc.).This
Outside, storage device 450 may include high-speed random access memory, can also include nonvolatile memory, for example, at least one
A disk memory, flush memory device or other non-volatile solid state memory parts.In some instances, storage device 450 can
It further comprise the memory remotely located relative to processor 440, these remote memories can pass through network connection to clothes
Business device.The example of above-mentioned network includes but is not limited to internet, intranet, local area network, mobile radio communication and combinations thereof.
The embodiment of the present invention also provides a kind of computer readable storage medium, is stored thereon with computer program, the program
Collimated device means for correcting realizes that the present invention implements the collimator bearing calibration provided when executing, this method comprises: obtaining current
The corresponding default code value of collimating slit；Multiple codes that the collimator is located in the neighbouring setting range of the default code value are obtained respectively
When value, corresponding scan data, and according to the corresponding scan data of the multiple code value, school is carried out to the default code value
Just.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of collimator bearing calibration is applied to CT system characterized by comprising
Obtain the corresponding default code value of current collimating slit；
When obtaining multiple code values that the collimator is located in the neighbouring setting range of the default code value respectively, corresponding scanning
Data, and according to the corresponding scan data of the multiple code value, the default code value is corrected.
2. the method according to claim 1, wherein described according to the corresponding scan data of the multiple code value,
The default code value is corrected, comprising:
The transmitted intensity that the corresponding detector of each code value receives is obtained according to the scan data；
Target code value corresponding when the transmitted intensity meets setting intensity threshold is determined, as the default code value after correction.
3. according to the method described in claim 2, it is characterized in that, described obtain the collimator respectively and be located at the code presupposition
When being worth multiple code values in setting range nearby, corresponding scan data, and according to the corresponding scanning number of the multiple code value
According to being corrected to the default code value, comprising:
According to the reference deviation of the default code value and the collimating slit, determines and refer to code value section；
It obtains the collimating slit and is located at scan data corresponding when the end value with reference to code value section, and according to the scanning
Data determine the corresponding transmitted intensity of two end values respectively；
Adjustable reference code value is mobile to fixed reference code value direction, and using the code value after mobile as adjustable reference code value,
It updates described with reference to code value section；Wherein, the fixed reference code value is the biggish end value of transmitted intensity, the adjustable reference code
Value is the lesser end value of transmitted intensity；
It returns and executes scan data acquisition operation, set until the difference of the adjustable reference code value and fixed reference code value is less than
Threshold value；
Default code value according to the end value in reference code value section, after determining correction.
4. according to the method described in claim 3, it is characterized in that, it is described by adjustable reference code value to fixed reference code value side
To before movement, further includes:
It determines the siding-to-siding block length with reference to code value section, and is adjusted according to default than the product with the siding-to-siding block length, determined
Step-length to be regulated；
Correspondingly, adjustable reference code value is mobile to fixed reference code value direction, comprising:
The adjustable reference code value is moved into the step-length to be regulated to fixed reference code value direction.
5. the method according to claim 1, wherein being located at the default code value obtaining the collimator respectively
When multiple code values in neighbouring setting range, before corresponding scan data, further includes:
Multiple code values that the collimating slit is moved in the neighbouring setting range of the default code value are controlled respectively, and to body to be detected
Scan operation is executed, scan data corresponding to the multiple code value is obtained.
6. method according to claim 1-5, which is characterized in that according to the corresponding scanning of the multiple code value
Data, after being corrected to the default code value, further includes:
Other collimating slits in collimator are selected, default code value is continued to execute and obtains operation, until completing in the collimator
Each collimating slit default code value correction.
7. method according to claim 1-5, which is characterized in that according to the corresponding scanning of the multiple code value
Data, after being corrected to the default code value, further includes:
According to the default code value after the geometric parameter and corresponding correction for having corrected collimating slit, preset to collimating slit is not corrected
Code value is corrected.
8. a kind of collimator means for correcting, is configured at CT system characterized by comprising
Default code value obtains module, for obtaining the corresponding default code value of current collimating slit；
Default code value correction module, for obtain respectively the collimator be located at it is more in setting range near the default code value
When a code value, corresponding scan data, and according to the corresponding scan data of the multiple code value, the default code value is carried out
Correction.
9. a kind of CT system, including bulb, collimator and detector, which is characterized in that further include:
One or more processors；
Storage device, for storing one or more programs；
One or more of programs are executed by one or more of processors, so that one or more of processors are realized
Such as a kind of collimator bearing calibration of any of claims 1-7.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
A kind of such as claim 1-7 described in any item collimator bearing calibrations are realized when execution.
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