CN109770935A - 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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- CN109770935A CN109770935A CN201811627437.2A CN201811627437A CN109770935A CN 109770935 A CN109770935 A CN 109770935A CN 201811627437 A CN201811627437 A CN 201811627437A CN 109770935 A CN109770935 A CN 109770935A
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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 first blade respectively and second blade is moved to current code value corresponding at target closed；Wherein, the target closed point is the line of the focus of bulb and the target point of the detector array and the intersection point of reference axis；The first blade and the second blade in collimator are moved along reference axis；Respectively according to first blade, the current code value of second blade and the corresponding difference preset between code value, corrected value is determined, to be corrected according to the corrected value to the collimator position.Make by adopting the above technical scheme when being scanned using CT system, can be compensated to due to bulb, collimator and detector array installation process bring machine error, and then improves 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.
Referring to Figure 1A, in CT imaging process, in order to reduce scattered rays interference, reduce patient radiological dose and
Improve the image quality of CT image, it will usually which collimator 120 is set between bulb 110 and detector array 130, to ball
The X-ray that pipe is emitted is collimated.Wherein, collimator 120 includes the first blade and the second blade, for passing through the first blade
The width for being formed by collimating slit is determined along the relative movement of same reference axis with the second blade, and then bulb 110 is emitted
X-ray collimated.
However, due to there is certain machinery in 130 installation process of bulb 110, collimator 120 and detector array accidentally
Difference causes when being scanned imaging using CT system, due to the position of set collimator 120 and the first blade,
Two blades are formed by the width inaccuracy of collimating slit, 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, the CT system the embodiment of the invention provides a kind of collimator bearing calibration
Including bulb, collimator and detector array, wherein the collimator includes the first blade and the second blade, first leaf
Piece and second blade are moved along same reference axis, and the collimator bearing calibration includes:
First blade is obtained respectively and second blade is moved to current code value corresponding at target closed；
Wherein, the target closed point is the friendship of the line and the reference axis of the focus of bulb and the target point of the detector array
Point；
Respectively according to first blade, the current code value of second blade and the corresponding difference preset between code value
Value, determines corrected value, to be corrected according to the corrected value to the collimator position.
Second aspect, the embodiment of the invention also provides a kind of collimator means for correctings, are configured at CT system, the CT system
System include bulb, collimator and detector array, wherein the collimator include the first blade and the second blade, described first
Blade and second blade are moved along same reference axis, and the collimator means for correcting includes:
Current code value obtains module, for obtain first blade respectively and second blade be moved to it is target closed
Corresponding current code value when point；Wherein, the target closed point is the focus of bulb and the target point of the detector array
Line and the reference axis intersection point；
Corrected value determining module, for respectively according to first blade, the current code value of second blade and phase
The difference between default code value answered, determines corrected value, to be corrected according to the corrected value to the collimator position.
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 by obtain the first blade respectively and the second blade to be moved to target closed point be corresponding
Current code value；Wherein, target closed point is the line of the focus of bulb and the target point of detector array and the intersection point of reference axis；
And respectively according to the difference between the current code value of the first blade, the second blade in collimator and corresponding default code value,
Corrected value is determined, to be corrected according to corrected value collimation device position.It solves by adopting the above technical scheme in the prior art
Due to bulb, collimator and detector array installation process bring machine error, lead to collimating slit position and collimator
First blade and the second blade are formed by collimating slit width inaccuracy, and then the technology for affecting the image quality of CT image is asked
Topic so that being compensated when using CT system to above-mentioned machine error, and then improves the image quality of CT image.
Detailed description of the invention
Figure 1A is the hardware structural diagram of CT system；
Figure 1B is a kind of flow chart of collimator bearing calibration in the embodiment of the present invention one；
Fig. 2 is the flow chart of one of embodiment of the present invention two collimator bearing calibration；
Fig. 3 A is the flow chart of one of embodiment of the present invention three collimator bearing calibration；
Fig. 3 B is the corresponding transmitted intensity figure of each row's detector in the embodiment of the present invention three；
Fig. 4 is the structural schematic diagram of one of embodiment of the present invention four collimating slit means for correcting；
Fig. 5 is the structural schematic diagram of one of the embodiment of the present invention five 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
Figure 1B is the flow chart of one of embodiment of the present invention one collimator bearing calibration.The present invention is suitable for Figure 1A
Shown in machine error in CT system the case where compensating.This method is executed by collimator means for correcting, the device by
Software and or hardware realization, and be configured in CT system.Wherein, referring to Figure 1A, CT system includes bulb 110, collimator 120
With detector array 130, wherein the collimator 120 includes the first blade and the second blade, first blade and described the
Two blades are moved along same reference axis.
A kind of collimator bearing calibration as shown in Figure 1B, comprising:
S110, obtain first blade respectively and second blade be moved to it is corresponding current at target closed
Code value.
Referring to Figure 1A, wherein the target closed point O is the focus S of bulb 110 and the mesh of the detector array 130
The intersection point of the line of punctuate D and the reference axis.
Illustratively, target point D can be the central point of detector array；Correspondingly, target closed point O is bulb 110
Focus S and detector array 130 target point D line and reference axis intersection point.
Illustratively, when can directly acquire the first blade and being moved at target closed, the driving electricity of the first blade is controlled
When the current code value of the first of machine and the second blade are moved at target closed, the second of the driving motor of the second blade is controlled
Current code value；The first blade can also be controlled respectively and the second blade is moved to target closed point, then obtain the first blade again
Driving motor the first current code value and the second blade driving motor the second current code value.
S120, respectively according to first blade, the current code value of second blade and accordingly default code value it
Between difference, corrected value is determined, to be corrected according to the corrected value to the collimator position.
Wherein, the first blade and the second blade that code value be calculating are preset when being installed on theoretical installation site, the first blade
The corresponding first theoretical code value of driving motor and the second blade the corresponding second theoretical code value of driving motor.
Specifically, according to the difference between the corresponding first current code value of the first blade and the first theoretical code value, the is determined
One correction code value, to be corrected according to the setting position of the first blade of the first correction code value collimation device；According to the second leaf
Difference between the corresponding second current code value of piece and the second theoretical code value, determines the second correction code value, according to the second correction
The setting position of second blade of code value collimation device is corrected.It is understood that the first correction code value and the second correction
Code value can be positive value or negative value.
It is understood that the first of same CT system can also be directed in order to improve the accuracy of determining corrected value
Blade and the second blade repeat to determine multiple corrected value；According to the average value of the corresponding each corrected value of the first blade, first is determined
The correction of a final proof value of blade, and according to the average value of the corresponding each corrected value of the second blade, determine the final school of the second blade
Positive value.
Optionally, the collimator position is corrected according to the corrected value, comprising: obtain required collimation slit width
Degree, and the corresponding first initial code value of first blade and second blade pair are determined according to required collimating slit width
The initial code value of second answered；The corresponding corrected value of the first blade is obtained, in conjunction with the described first initial code value, obtains first object code
Value, and obtain the corresponding corrected value of the second blade and obtain the second target code value in conjunction with the described second initial code value；Control institute
It states the first blade and is moved to the first object code value, and control second blade is moved to the second target code value.
Specifically, according to required collimating slit width, determining corresponding first blade before being scanned using CT system
First initial code value and the second initial code value corresponding to theoretical installation position with the second blade；Obtain the first of the first blade
Correct code value, and calculate first correction code value and the first initial code value and value obtain first object code value；Obtain the second blade
Second correction code value, and calculate second correction code value and the second initial code value and value obtain the second target code value；Control the
The driving motor of one blade drives the first blade to the driving electricity of the corresponding position of first object code value, and the second blade of control
Machine drives the corresponding position of the second blade to the second target code value.
It illustratively, can also be after determining corrected value, by the corrected value of each blade and corresponding first blade or second
The corresponding storage of blade, also i.e. by the first correction code value storage corresponding with the first blade, by the second correction code value and the second blade pair
It should store, so that the first blade and the corresponding corrected value of the second blade can be directly acquired when carrying out collimator adjustment every time.
Specifically, correction code value can store in CT system local, or other storage equipment associated with CT system
Or cloud.Wherein, the adjustment of progress collimator, which can be, adjusts collimator to required standard when being scanned every time using CT system
Vertical masonry joint width.
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
Row corrected value redefines, or further updates storage, so that corrected value matches with current CT system.
It certainly, can also be after determining corrected value, directly in order to reduce operand when CT system adjustment collimating slit width
It connects and pre-stored collimating slit width table in CT system is updated using the corrected value of each blade respectively, for reading.Wherein, it collimates
The theoretical code value of corresponding first blade of each collimating slit width and the theoretical code of the second blade have been stored in advance in slit width degree table
Value.Specifically, can according to each theoretical code value of the corrected value of the first blade and the first blade and value, update each collimation slit width
Spend the theoretical code value of corresponding first blade；According to each theoretical code value of the corrected value of the second blade and the second blade and value,
Update the theoretical code value of corresponding second blade of each collimating slit width.
The embodiment of the present invention by obtain the first blade respectively and the second blade to be moved to target closed point be corresponding
Current code value；Wherein, target closed point is the line of the focus of bulb and the target point of detector array and the intersection point of reference axis；
And respectively according to the difference between the current code value of the first blade, the second blade in collimator and corresponding default code value,
Corrected value is determined, to be corrected according to corrected value collimation device position.It solves by adopting the above technical scheme in the prior art
Due to bulb, collimator and detector array installation process bring machine error, lead to collimating slit position and collimator
First blade and the second blade are formed by collimating slit width inaccuracy, and then the technology for affecting the image quality of CT image is asked
Topic so that being compensated when using CT system to above-mentioned machine error, and then improves 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.The embodiment of the present invention is above-mentioned
On the basis of the technical solution of each embodiment, additional optimization has been carried out.
Further, " first blade is obtained respectively and when second blade is moved at target closed in operation
It is additional " to obtain scan data and determine the target of receivable ray according to the scan data before corresponding current code value "
Detector array；According between the bulb, first blade, second blade and the target detector array
Positional relationship determines the first distance between first blade and the target closed point and second blade respectively
With the second distance between the target closed point；According to the first distance and the second distance, described is controlled respectively
One blade and second blade are moved to the target closed point ", to determine the first blade and the second blade to target closed
The distance of required movement between point, and according to the movement of determining distance controlling the first blade and the second blade.
A kind of collimator bearing calibration as shown in Figure 2, comprising:
S210, the target detector array for obtaining scan data and determining receivable ray according to the scan data.
Specifically, obtaining scan data of the collimator at current location, and each detector pair is determined according to scan data
The transmitted intensity answered；When transmitted intensity is less than given threshold, show that corresponding detector is blocked；When transmitted intensity is not less than
When given threshold, show that corresponding detector is not blocked；Determine that each detector not being blocked is target detector array.Its
In, given threshold can be set based on experience value by technical staff, alternatively, correspondence can also be obtained in bulb not divergent-ray
Scan data, and determine scan data reference transmitted intensity, and will refer to transmitted intensity as given threshold.It is exemplary
Ground, when scan data can be scanning air dielectric or needle mould, generated scan data.
S220, according between the bulb, first blade, second blade and the target detector array
Positional relationship, determine the first distance between first blade and the target closed point and second leaf respectively
Second distance between piece and the target closed point.
Specifically, according between the bulb and the reference axis the first designed distance and the bulb with it is described
The second designed distance between detector array determines collimating slit distance corresponding with the target detector array；According to institute
Target detector array distribution is stated in the detector quantity ratio and the collimation of the target point first direction and second direction
Distance is stitched, determines the first distance and the second distance；Wherein, the first direction is the target point far from described the
The side of two blades, the second direction are side of the target point far from first blade.
Referring to the schematic diagram of CT system shown in figure 1A, according to first between bulb 110 and the reference axis of collimator 120
The second designed distance SDD between designed distance SBD and bulb 110 and detector array 130, determines target detector battle array
Arrange corresponding collimating slit distance l.Specifically, the detector number of rows according to included in target detector array and every row detection
The width of device determines the width L of target detector array；According between the first designed distance SBD and the second designed distance SDD
Ratio determines the first mapping ratio, and determines collimating slit than the product with the width L of target detector array according to the first mapping
Distance l.
Specifically, according to be distributed in target detector array target point D first direction (left side in corresponding diagram 1A) and
Ratio between the number of rows of the detector of second direction (right side in corresponding diagram 1A) determines the second mapping ratio, and according to second
Mapping determines the first distance l of the first blade distance objective target point D than the product with collimating slit distance l1And second leaf
Second distance l of the piece apart from target point D2。
S230, according to the first distance and the second distance, control first blade and second leaf respectively
Piece is moved to the target closed point.
Specifically, determine the first code value to be regulated of the driving motor of the first blade according to first distance, according to second away from
The second code value to be regulated from the driving motor for determining the second blade.The first blade is controlled according to the first code value to be regulated to be moved to
It is target closed, and the second blade is controlled according to the second code value to be regulated and is moved to target closed point.
It should be noted that can be set as needed mobile number when each blade is moved at target closed, such as
It can be mobile once to target closed point by the first blade and mobile once to target closed point through the second blade.Certainly, it is
The fitness of the first blade and the second blade closed position and target closed point is improved, and then improves the essence of the corrected value of determination
Exactness can also repeatedly move the first blade and the second blade respectively.
Illustratively, according to the first distance and the second distance, first blade and described are controlled respectively
Two blades are moved to the target closed point, may is that one of them controlled in each blade is moved to the target closed point,
The first Current Scan data are obtained, and determine that respectively row visits in first object detector array according to the first Current Scan data
Survey the corresponding transmitted intensity of device；And another in each blade is controlled to the target closed point movement, it is current to obtain second
Scan data, and determined according to the second Current Scan data and respectively to arrange that detector is corresponding to be penetrated in the second target detector array
Line intensity；Continue to control each blade to the target closed point movement, until each row in the first object detector array
The corresponding transmitted intensity of detector is less than given threshold, and each row's detector in the second target detector array is corresponding
Transmitted intensity be less than the given threshold；Wherein, the first object detector array is classified as the target detector array point
Detector of the cloth in the target point first direction；The second target detector array is the target detector array distribution
In the detector of the target point second direction.
Optionally, one of them in each blade is controlled to the target closed point movement, and in each blade of control
Another may is that acquisition first is default and adjusts step-length to the target closed point movement, according to first it is default adjust step-length to
It is target closed to put the first blade of movement, and the second default adjusting step-length is obtained, it is closed according to the second default adjusting step-length to target
Chalaza moves the second blade.It is understood that the first default step-length that adjusts can be identical with the second default adjusting step-length, it can also
With difference.
Or it is optional, it is moved in one of them controlled in each blade to the target closed point, and each leaf of control
In piece another to the target closed point it is mobile before, further includes: it is corresponding according to first blade, second blade
Default adjusting ratio and the first distance and the second distance, determine that the first of first blade adjusts step respectively
Long and second blade second adjusts step-length.Correspondingly, controlling one of them in each blade to the target closed point
It is mobile, and another in each blade of control be to the target closed point movement, it may also is that control first blade to
The target closed point mobile described first adjusts step-length, and controls second blade to the target closed mobile institute of point
State the second adjusting step-length.
Optionally, to it is target closed put mobile first blade and the second blade when, can with mobile first blade of single and/
Or after mobile second blade of single, the target that scan data obtains and determines receivable ray according to scan data is re-started
Detector array, until the first blade and the second blade are in target closed point closure.Specifically, determining the first blade and the second leaf
Piece may is that that the corresponding ray of detector array is respectively arranged in determining first object detector array is strong in target closed point closure
Degree is less than given threshold, and determines that the corresponding ray of each row's detector in the second target detector array is slightly less than setting
Threshold value.Wherein, the first object detector array is classified as the target detector array distribution in the target point first direction
The detector of (on the left of the D point in corresponding diagram 1A)；The second target detector array is the target detector array distribution
In the detector of the target point second direction (on the right side of the D point in corresponding diagram 1A).
It is understood that in order to avoid the first blade by the occlusion detector of second direction or the second blade by
The case where occlusion detector in one direction, does not lead to the practical closing point of the first blade and the second blade and target closed point not
Match, preferably each moving blade is scanned the acquisition of data and the determination of target detector array, until the first leaf
Piece blocks and only blocks first object detector array and the second blade blocks and only blocks the second target detector array.
Certainly, in order to block the second target detector array in the first blade or the second blade blocks first object and visits
When surveying device array, it can remedy in time, it can also be by the first blade to first direction (the D point in corresponding diagram 1A of target closed point
Left side), or it is the second blade is mobile to the second direction (right side of D point in corresponding diagram 1A) of target closed point, until the
One blade blocks and only blocks first object detector array and the second blade blocks and only blocks the second target detector battle array
Column.Specific moving step length, which can be used, determines that the distance of each blade current location distance objective closing point determines code value to be adjusted back,
And each blade is once moved according to determining code value to be adjusted back；Or it according to code value to be adjusted back and step-length to be adjusted back, repeatedly moves
Move each blade；Or according to default readjustment ratio and code value to be adjusted back, determine the step-length to be adjusted back for moving each blade every time, and root
The step-length to be adjusted back determined according to each time moves each blade respectively.
S240, obtain first blade respectively and second blade be moved to it is corresponding current at target closed
Code value.
S250, respectively according to first blade, the current code value of second blade and accordingly default code value it
Between difference, corrected value is determined, to be corrected according to the corrected value to the collimator position.
The embodiment of the present invention passes through corresponding when obtaining the first blade respectively and the second blade is moved at target closed
Current code value before, first distance and the second blade between additional first blade and target closed point with it is target closed
The determination scheme of second distance between point, and based on determining first distance and second distance, control respectively the first blade and
Second blade is moved to target closed point, the perfect move mode of each blade, and side that is mobile by single or repeatedly moving
Formula is closed the first blade and the second blade target closed position, and then lays the foundation for the determination of corrected value.
Embodiment three
Fig. 3 A is the flow chart of one of embodiment of the present invention three collimator bearing calibration.The embodiment of the present invention is above-mentioned
A kind of preferred embodiment is provided on the basis of the technical solution of each embodiment.
A kind of collimator bearing calibration as shown in Figure 3A, comprising:
S301, scanning air dielectric obtain Current Scan data, and determine penetrating for each detector according to Current Scan data
Line intensity.
S302, the detector for determining that transmitted intensity is not less than given threshold are target detector array.
Wherein, when given threshold is that bulb does not issue ray, the corresponding ray of scan data that air dielectric obtains is acquired
Intensity.Referring to respectively arranging the corresponding transmitted intensity figure of detector shown in Fig. 3 B.Wherein, abscissa is detector number of rows, ordinate
For transmitted intensity, offset corresponds to given threshold.Wherein, target detector array is that 142~218 row's detectors are formed by spy
Survey device array.
S303, according to the distance between the focus of bulb and reference axis of collimators vanes, focus and detection with bulb
The ratio of the distance between device array determines the first mapping ratio.
Referring to Figure 1A, according to formulaDetermine the first mapping ratio α, wherein SBD is the focus and collimator of bulb
The distance between reference axis of blade, SDD are the distance between focus and detector array of bulb.
The product of S304, the width value for determining target detector array and the first mapping ratio, determine collimating slit width.
Collimating slit width l is determined according to formula l=α × L referring to Figure 1A, wherein L is the width of target detector array
Value.
S305, the target point according to detector array determine the detection being located on the left of target point in target detector array
The ratio of detector quantity on the right side of device quantity and target point, for the second mapping ratio.
Tool is referring to Figure 1A, and the target point of detector array is D point, and detector quantity can be the quantity or detection of detector
Device number of rows.Of same size due to every row's detector, the quantity of every row's detector is also identical, therefore, can pass through the second mapping
Than characterization is located at the width L of the target detector array on the left of target point D1With the target detector battle array being located on the right side of target point D
The width L of column2Ratio.
S306, according to the second mapping ratio and collimating slit width, determine the between left collimating vanes and target closed point
The second distance of one distance and right collimating vanes and target closed point.
Specifically, according to formulaDetermine first distance l1And second distance l2。
S307, it adjusts according to preset first than determining the first adjusting step-length with first distance, and according to preset the
Two are adjusted than determining the second adjusting step-length with second distance.
Specifically, according to formulaDetermine the first adjusting step delta l1And second adjust step delta l2。
S308, the left collimating vanes of step size controlling are adjusted according to first to the target closed mobile corresponding code value of point, and according to
Second adjusts the right collimating vanes of step size controlling to the target closed mobile corresponding code value of point.
S309, after having blade mobile, judge whether left collimating vanes and right collimating vanes just close in target closed point
It closes；If so, executing S310, S301 is executed if it is not, then returning.
Specifically, judging each detector on the left of target closed point whether only by left collimation after the left collimating vanes of movement
Blade blocks；After the right collimating vanes of movement, judge whether each detector on the right side of target closed point is only hidden by right collimating vanes
Gear.Wherein, when target closed point is blocked by detector, the transmitted intensity for the detector being respectively blocked is less than given threshold.
S310, left collimating vanes are obtained respectively and right collimating vanes are moved to corresponding current code value at target closed.
S311, respectively according to the difference between the current code value of left and right collimating vanes and corresponding default code value, determine
The corresponding corrected value of left and right collimating vanes.
Example IV
Fig. 4 is the structural schematic diagram of one of embodiment of the present invention four collimating slit means for correcting.The present invention be suitable for pair
The case where machine error in CT system shown in figure 1A compensates, the device are configured at by software and or hardware realization
In CT system.Wherein, the CT system includes bulb, collimator and detector array, wherein the collimator includes the first leaf
Piece and the second blade, first blade and second blade are moved along same reference axis.
A kind of collimator means for correcting as shown in Figure 4, comprising: current code value obtains module 410 and corrected value determines
Module 420.
Wherein, current code value obtains module 410, is moved to for obtaining first blade and second blade respectively
Corresponding current code value at target closed；Wherein, focus and the detector array of the target closed point for bulb
Target point line and the reference axis intersection point；
Corrected value determining module 420, for respectively according to first blade, second blade current code value and
Difference between corresponding default code value, determines corrected value, to be corrected according to the corrected value to the collimator position.
The embodiment of the present invention obtains the first blade respectively by current code value acquisition module and the second blade is moved to target
Closing point is corresponding current code value；Wherein, target closed point is the company of the focus of bulb and the target point of detector array
The intersection point of line and reference axis；And worked as respectively according to the first blade, second blade in collimator by corrected value determining module
Difference between preceding code value and corresponding default code value, determines corrected value, to carry out school according to corrected value collimation device position
Just.It solves by adopting the above technical scheme in the prior art since bulb, collimator and detector array installation process are brought
Machine error, cause collimating slit position and the first blade of collimator and the second blade to be formed by collimating slit width inaccurate
Really, the technical issues of and then affecting the image quality of CT image, so that being subject to when using CT system to above-mentioned machine error
Compensation, and then improve the image quality of CT image.
Further, the device further include:
Target detector array obtains module, for obtaining first blade and second blade shifting respectively described
When moving to target closed before corresponding current code value, obtaining scan data and simultaneously being determined according to the scan data be can receive
The target detector array of ray；
Apart from determining module, for being visited according to the bulb, first blade, second blade and the target
The positional relationship between device array is surveyed, determines the first distance between first blade and the target closed point respectively, with
And the second distance between second blade and the target closed point；
Blade mobile module, for controlling first blade respectively according to the first distance and the second distance
The target closed point is moved to second blade.
It is further, described apart from determining module, comprising:
Collimating slit distance determining unit, for according to the first designed distance between the bulb and the reference axis, with
And the second designed distance between the bulb and the detector array, determine standard corresponding with the target detector array
Vertical masonry joint distance；
Distance determining unit is used for according to the target detector array distribution in the target point first direction and second
The detector quantity ratio in direction and the collimating slit distance, determine the first distance and the second distance；
Wherein, the first direction is side of the target point far from second blade, and the second direction is institute
State side of the target point far from first blade.
Further, the blade mobile module, comprising:
Transmitted intensity determination unit, for control in each blade one of them to it is described it is target closed point movement, obtain
First Current Scan data, and determined in first object detector array according to the first Current Scan data and respectively arrange detector
Corresponding transmitted intensity；And control in each blade another to it is described it is target closed point movement, obtain the second Current Scan
Data, and determine that according to the second Current Scan data, that the corresponding ray of detector is respectively arranged in the second target detector array is strong
Degree；
Cycling element, for continuing to control each blade to the target closed point movement, until the first object detects
The corresponding transmitted intensity of each row's detector in device array is less than given threshold, and in the second target detector array
Each corresponding transmitted intensity of detector of arranging is less than the given threshold；
Wherein, the first object detector array is classified as the target detector array distribution in the target point first party
To detector；The second target detector array is the target detector array distribution in the target point second direction
Detector.
Further, the transmitted intensity determination unit is controlling one of them in each blade to described target closed
In point movement, and each blade of control another to the target closed point it is mobile before when, be specifically used for:
According to first blade, the corresponding default adjusting ratio of second blade and the first distance and described
Second distance determines the first of first blade the second adjusting step-length for adjusting step-length and second blade respectively；
Correspondingly, the transmitted intensity determination unit, one of them in each blade is being controlled to the target closed point
Another in movement, and each blade of control is specifically used for when the target closed point movement:
It controls first blade and adjusts step-length, and control described second to the target closed point mobile described first
Blade adjusts step-length to the target closed point mobile described second.
Further, the device further include:
Correction module is corrected the collimator position according to the corrected value for described.
Further, correction module, comprising:
Initial code value determination unit is determined for obtaining required collimating slit width, and according to required collimating slit width
The corresponding first initial code value of first blade and the corresponding second initial code value of second blade；
Object code value obtains unit, obtains for obtaining the corresponding corrected value of the first blade in conjunction with the described first initial code value
To first object code value, and obtains the corresponding corrected value of the second blade and obtain the second target in conjunction with the described second initial code value
Code value；
Blade mobile unit is moved to the first object code value for controlling first blade, and described in control
Second blade is moved to the second target code value.
Further, which further includes memory module, is used for:
Before obtaining the corresponding corrected value of the first blade and obtaining the corresponding corrected value of the second blade, by each blade
Corrected value and corresponding first blade or the corresponding storage of the second blade.
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.
Embodiment five
Fig. 5 is the structural schematic diagram of one of the embodiment of the present invention five CT system, which includes bulb 510, standard
Straight device 520, detector array 530, further includes:
One or more processors 540；
Storage device 550, for storing one or more programs.
In Fig. 5 by taking a processor 540 as an example, processor 540 in the CT system respectively with bulb 510, collimator 520
And detector array 530 is connected by bus or other modes, processor 540 and storage device 550 also by bus or its
He connects mode.In Fig. 5 for being connected by bus.
In the present embodiment, the processor 540 in CT system can obtain the first blade in collimator 520 and respectively
Two blades are moved to current code value corresponding at target closed；Wherein, the target closed point be bulb 510 focus with
The line of the target point of detector array 530 and the intersection point of the reference axis in collimator 520；Wherein the first blade in collimator
It is relatively moved with the second blade along reference axis；Can also respectively according in collimator 520 the first blade, the second blade it is current
The difference between the corresponding default code value of the first blade, the second blade stored in code value and storage device 550 determines correction
Value, to be corrected according to the corrected value to the collimator position.
Storage device 550 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, attached current code value shown in Fig. 4 obtains module 410 and corrected value determines
Module 420.).Software program, instruction and the module that processor 540 is stored in storage device 550 by operation, to hold
The various function application and data processing of row CT system, i.e. collimator bearing calibration in realization above method embodiment.
Storage device 550 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；Storage data area can storing data etc. (work as former code in such as above-described embodiment
Value, default code value and corrected value etc.).In addition, storage device 550 may include high-speed random access memory, can also wrap
Include nonvolatile memory, for example, at least a disk memory, flush memory device or other non-volatile solid state memories
Part.In some instances, storage device 550 can further comprise the memory remotely located relative to processor 540, these are remote
Journey memory can pass through network connection to server.The example of above-mentioned network include 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 respectively
First blade and second blade are moved to current code value corresponding at target closed；Wherein, the target is closed
Chalaza is the line of the focus of bulb and the target point of the detector array and the intersection point of the reference axis；Respectively according to
First blade, the current code value of second blade and the corresponding difference preset between code value, determine corrected value, with basis
The corrected value is corrected the collimator position.
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, it is applied to CT system, the CT system includes bulb, collimator and detector array,
Wherein, the collimator includes the first blade and the second blade, and first blade and second blade are along same reference axis
It is mobile, which is characterized in that the collimator bearing calibration includes:
First blade is obtained respectively and second blade is moved to current code value corresponding at target closed；Its
In, the target closed point is the friendship of the line and the reference axis of the focus of bulb and the target point of the detector array
Point；
Respectively according to first blade, second blade current code value and corresponding default code value between difference,
Corrected value is determined, to be corrected according to the corrected value to the collimator position.
2. the method according to claim 1, wherein obtaining first blade and described second respectively described
Blade is moved to before current code value corresponding at target closed, further includes:
It obtains scan data and determines the target detector array of receivable ray according to the scan data；
It is closed according to the position between the bulb, first blade, second blade and the target detector array
System, determine respectively first distance between first blade and the target closed point and second blade with it is described
Second distance between target closed point；
According to the first distance and the second distance, first blade is controlled respectively and second blade is moved to institute
State target closed point.
3. according to the method described in claim 2, it is characterized in that, described according to the bulb, first blade, described
Positional relationship between two blades and the target detector array, determine respectively first blade with it is described target closed
The second distance between first distance and second blade and the target closed point between point, comprising:
According between the bulb and the reference axis the first designed distance and the bulb and the detector array it
Between the second designed distance, determine corresponding with target detector array collimating slit distance；
According to the target detector array distribution the target point first direction and second direction detector quantity ratio, with
And the collimating slit distance, determine the first distance and the second distance；
Wherein, the first direction is side of the target point far from second blade, and the second direction is the mesh
Side of the punctuate far from first blade.
4. according to the method described in claim 2, it is characterized in that, according to the first distance and the second distance, respectively
It controls first blade and second blade is moved to the target closed point, comprising:
One of them in each blade is controlled to the target closed point movement, obtains the first Current Scan data, and according to institute
It states the first Current Scan data and determines and respectively arrange the corresponding transmitted intensity of detector in first object detector array；And control
Another in each blade obtains the second Current Scan data, and current according to described second to the target closed point movement
Scan data, which determines, respectively arranges the corresponding transmitted intensity of detector in the second target detector array；
Continue to control each blade to the target closed point movement, until each row detection in the first object detector array
The corresponding transmitted intensity of device is less than given threshold, and each row's detector in the second target detector array is corresponding penetrates
Line intensity is less than the given threshold；
Wherein, the first object detector array is classified as the target detector array distribution in the target point first direction
Detector；The second target detector array is spy of the target detector array distribution in the target point second direction
Survey device.
5. according to the method described in claim 4, it is characterized in that, being closed in one of them controlled in each blade to the target
Chalaza is mobile, and in each blade of control another to the target closed point it is mobile before, further includes:
According to first blade, the corresponding default adjusting ratio of second blade and the first distance and described second
Distance determines the first of first blade the second adjusting step-length for adjusting step-length and second blade respectively；
Correspondingly, one of them controlled in each blade is moved to the target closed point, and another in each blade of control
It is a to be moved to the target closed point, comprising:
It controls first blade and adjusts step-length, and control second blade to the target closed point mobile described first
Step-length is adjusted to the target closed point mobile described second.
6. method according to claim 1-5, which is characterized in that it is described according to the corrected value to the collimation
Device position is corrected, comprising:
Collimating slit width needed for obtaining, and first blade corresponding first is determined initially according to required collimating slit width
Code value and the corresponding second initial code value of second blade；
The corresponding corrected value of the first blade is obtained, in conjunction with the described first initial code value, obtains first object code value, and obtains the
The corresponding corrected value of two blades obtains the second target code value in conjunction with the described second initial code value；
It controls first blade and is moved to the first object code value, and control second blade is moved to described second
Target code value.
7. according to the method described in claim 6, it is characterized in that, obtaining the corresponding corrected value of the first blade and obtaining the
Before the corresponding corrected value of two blades, further includes:
By the corrected value of each blade and corresponding first blade or the corresponding storage of the second blade.
8. a kind of collimator means for correcting, it being configured at CT system, the CT system includes bulb, collimator and detector array,
Wherein, the collimator includes the first blade and the second blade, and first blade and second blade are along same reference axis
It is mobile, which is characterized in that the collimator means for correcting includes:
Current code value obtains module, for obtaining first blade respectively and when second blade is moved at target closed
Corresponding current code value；Wherein, the target closed point is the company of the focus of bulb and the target point of the detector array
The intersection point of line and the reference axis；
Corrected value determining module, for respectively according to first blade, the current code value of second blade and corresponding
Difference between default code value, determines corrected value, to be corrected according to the corrected value to the collimator position.
9. a kind of CT system, including bulb, collimator and detector array, 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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