CN110327064A - Source image distance detecting method, device and equipment - Google Patents
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Abstract
This application discloses a kind of source image distance detecting method, device and equipment.The source image distance detecting method is applied to the source image of radiation imaging system away from detection device, and the system also includes radioactive sources, detector, which comprises obtains radioactive source relative to the distance change value at sphere projection object or detector different distance；It is obtained at the different distance respectively, projection imaging of the sphere projection object on the imaging surface of the detector；According to the projection imaging and the distance change value at the different distance, determine the source image of the radiation imaging system away from.Due to the problem of sphere projection object has isotropic feature, and detector image-forming face may be not parallel to by avoiding the spatial attitude of projection object；Also, determine source image away from can be to avoid the zero point error and mechanism driving error of range sensor, to improve accuracy of the source image away from detection by distance change value.
Description
Technical field
This specification is related to technical field of medical equipment more particularly to a kind of source image distance detecting method, device and equipment.
Background technique
In radiation line imaging, source image refers to radioactive source and detector away from (Source Image Distance, SID)
The distance between imaging surface.Source image directly affects the correct of imaging scale away from being an important parameter for radiating line imaging
Property, and incorrect imaging scale, it will affect the assessment to size of tumor, and then influence follow-up clinical diagnosis.In certain rays
In imaging device, source image away from be it is adjustable, radiological dose also can according to source image away from difference and be adjusted, thus source image
Away from order of accuarcy directly affect the assessment of radiological dose.
Currently, usually being put by the view field on the imaging surface of the opening width of beam-defining clipper and detector to determine
The source image of radiation imaging apparatus away from.The spatial attitude that this method does not account for projection object may be not parallel to the imaging of detector
The case where face, and the movement position for directlying adopt projection object causes the source image being calculated away from value error as known parameters
It is larger, to affect the accuracy of radiological dose assessment, and affect the quality of radiation line imaging.
Summary of the invention
To overcome the problems in correlation technique, it present description provides a kind of source image distance detecting method, device and sets
It is standby.
Specifically, the application is achieved by the following technical solution:
In a first aspect, provide a kind of source image distance detecting method, the source image applied to radiation imaging system away from detection device,
The system also includes radioactive sources, detector, which comprises
Radioactive source is obtained relative to the distance change value at sphere projection object or detector different distance；
It is obtained at the different distance respectively, the sphere projects object projecting on the imaging surface of the detector
Picture；
According to the projection imaging and the distance change value at the different distance, the radiation imaging system is determined
Source image away from.
Optionally, radioactive source is obtained relative to the distance change value at sphere projection object or detector different distance, comprising:
It obtains the radioactive source and projects object with the sphere on the direction of the imaging surface perpendicular to the detector
Relative motion, the distance between the generated radioactive source and the sphere projection object changing value；Alternatively,
The radioactive source is obtained to occur relatively on the direction of the imaging surface perpendicular to the detector with the detector
Movement, the distance between the generated radioactive source and the detector changing value.
Optionally, the projection imaging be elliptic projection, according at the different distance projection imaging and it is described away from
From changing value, determine the source image of the radiation imaging system away from, comprising:
Determine the minor axis length of the elliptic projection；
According at different distance minor axis length, the distance change value and sphere projection object diameter, determine described in
Source image away from.
Optionally, the short axle of the elliptic projection is identified；
It calculates right angle of the short axle on the length and width direction of detector pixel array and decomposes length；
Length is decomposed according to right angle of the short axle on the length and width direction of detector pixel array, is calculated short
Shaft length.
Optionally, the different distance that the radioactive source projects object or detector relative to sphere includes first distance and second
Distance, the minor axis length include the first minor axis length corresponding with the first distance and the second distance and the second short axle
Length projects the diameter of object according to minor axis length, the distance change value and the sphere at different distance, determines the source image
Away from, comprising:
According to the diameter of sphere projection object and first minor axis length, the first distance and the source image are determined
Away from the first ratio；
According to the diameter of sphere projection object and second minor axis length, the second distance and the source image are determined
Away from the second ratio；
According to first ratio, second ratio and the distance change value, determine the source image away from.
Second aspect provides a kind of source image device for detecting distance, the source image applied to radiation imaging system away from detection device,
The system also includes radioactive source, detector, described device includes:
First acquisition unit becomes for obtaining radioactive source relative to the distance at sphere projection object or detector different distance
Change value；
Second acquisition unit, for being obtained at the different distance respectively, the sphere projection object is in the detector
Imaging surface on projection imaging；
Determination unit, described in determining according to the projection imaging and the distance change value at the different distance
The source image of radiation imaging system away from.
Optionally, the first acquisition unit is specifically used for: obtain the radioactive source perpendicular to the detector at
On the direction of image planes with the sphere projection object occur relative motion, the generated radioactive source and the sphere projection object it
Between distance change value；Alternatively,
The radioactive source is obtained to occur relatively on the direction of the imaging surface perpendicular to the detector with the detector
Movement, the distance between the generated radioactive source and the detector changing value.
Optionally, the projection imaging is elliptic projection, and the determination unit is specifically used for: determining the elliptic projection
Minor axis length；
According at different distance minor axis length, the distance change value and sphere projection object diameter, determine described in
Source image away from.
Optionally, the determination unit is specifically used for for determining the minor axis length of the elliptic projection:
Identify the short axle of the elliptic projection；
It calculates right angle of the short axle on the length and width direction of detector pixel array and decomposes length；
Length is decomposed according to right angle of the short axle on the length and width direction of detector pixel array, is calculated short
Shaft length.
Optionally, the different distance that the radioactive source projects object or detector relative to sphere includes first distance and second
Distance, the minor axis length include the first minor axis length corresponding with the first distance and the second distance and the second short axle
Length, the determination unit are projecting the straight of object according to minor axis length, the distance change value and the sphere at different distance
Diameter, determine the source image away from when, be specifically used for: according to the sphere project object diameter and first minor axis length, determine
The first distance and the source image away from the first ratio；
According to the diameter of sphere projection object and second minor axis length, the second distance and the source image are determined
Away from the second ratio；
According to first ratio, second ratio and the distance change value, determine the source image away from.
The third aspect provides a kind of source image away from detection device, is applied to radiation imaging system, the radiation line imaging system
System further includes radioactive source, detector, and the equipment includes movement mechanism, range sensor and MCU, in which:
The movement mechanism is for driving sphere projection object and/or radioactive source in the imaging surface perpendicular to the detector
Side moves upwards；
The range sensor for measure between sphere projection object and the radioactive source and the radioactive source with
The distance between detector changing value；
The MCU includes: internal bus, and the memory, processor and the external interface that are connected by internal bus；Its
In,
The external interface, for obtaining the data of the range sensor and detector；
The memory detects corresponding machine readable instructions for storage source image distance；
The processor for reading the machine readable instructions on the memory, and executes approach described above.
Fourth aspect provides a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that
Approach described above is realized when described program is executed by processor.
The technical solution that the embodiment of this specification provides can include the following benefits:
In this specification embodiment, the distance change value of object or detector is projected relative to sphere according to radioactive source, and
Projection imaging before and after distance change on the imaging surface of detector come determine the source image of radiology system away from.Since sphere projects
The problem of object has isotropic feature, and detector image-forming face may be not parallel to by avoiding the spatial attitude of projection object；And
And determined by distance change value source image away from, can to avoid the zero point error and mechanism driving error of range sensor, thus
Improve accuracy of the source image away from detection.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
This specification can be limited.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows the reality for meeting this specification
Example is applied, and is used to explain the principle of this specification together with specification.
Fig. 1 is the application scenarios schematic diagram of radiation imaging system；
Fig. 2 is a kind of flow chart of source image distance detecting method shown in one exemplary embodiment of the application；
Fig. 3 A be radioactive source shown in one exemplary embodiment of the application relative at sphere projection object different distance at
As schematic diagram；
Fig. 3 B is the top view of the elliptic projection shown in one exemplary embodiment of the application；
Fig. 4 A and Fig. 4 B be radioactive source shown in one exemplary embodiment of the application relative to detector different distance at
Imaging schematic diagram；
Fig. 4 C be shown in one exemplary embodiment of the application relative to Fig. 4 A radioactive source (and sphere projection object) relative to
Imaging schematic diagram at detector different distance；
Fig. 5 is a kind of source image device for detecting distance schematic diagram shown in one exemplary embodiment of the application；
Fig. 6 A is structural schematic diagram of a kind of source image away from detection device shown in one exemplary embodiment of the application；
Fig. 6 B is a kind of structural schematic diagram of fixed sphere projection object shown in one exemplary embodiment of the application；
Fig. 6 C is structural schematic diagram of another source image away from detection device shown in one exemplary embodiment of the application；
Fig. 7 is the structural schematic diagram of MCU shown in one exemplary embodiment of the application a kind of.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with this specification.On the contrary, they are only and such as institute
The example of the consistent device and method of some aspects be described in detail in attached claims, this specification.
Be the application scenarios schematic diagram of radiation imaging system referring to Fig. 1, the system include radioactive source 10, detector 20,
Image processing equipment 30.
Wherein, radioactive source 10 penetrates measurand 40 for detecting for emitting radioactive ray, such as X-ray, detector 20
Radioactive ray intensity.In the exit of radioactive source 10, beam-defining clipper 50 can also be set, with the radiation field size of limit radiation.
Based on measurand 40, such as human body, in each voxel the absorption coefficients of radioactive ray, detector 20 can be obtained
Data for projection corresponding with each voxel, image processing equipment 30 can carry out image reconstruction based on the data.
In image reconstruction process, source image away from accuracy influence radiation metering assessment accuracy and radiation line imaging
Quality, in order to improve accuracy of the source image away from measurement, the embodiment of the present application provide a kind of source image distance detecting method, device and
Equipment.
The application source image is described in detail away from detection embodiment below with reference to radiation imaging system shown in FIG. 1.
It referring to fig. 2, is one embodiment flow chart of the application source image distance detecting method, which may include following
Step:
In step 201, radioactive source is obtained relative to the distance change value at sphere projection object or detector different distance.
In this step, can using the sphere that the material strong to radiation absorbance ability makes as projection object, with
Clearly sphere projection is obtained on imaging surface.
The variation of the distance between radioactive source and sphere projection object, can be radioactive source in the imaging surface perpendicular to detector
On direction, occur what relative motion generated with sphere projection object.
In the case where sphere projection object is moved on the direction perpendicular to the imaging surface of detector, radioactive source is opposite
It can be obtained by range sensor in the distance change value of sphere projection object.For example, can preassign in radioactive source and spy
Certain point surveyed between device is the first reference point, so that sphere projection object is moved to the position of first reference point, obtains in the position
Locate the first value of feedback of range sensor.First value of feedback corresponds to first reference point to detector (namely to detector
Imaging surface) distance.Next, sphere projection object is made to move up to the second ginseng in the side of the imaging surface perpendicular to detector
Examination point, obtains the second value of feedback of range sensor at this location, which corresponds to second reference point to spy
Survey the distance of device (namely imaging surface to detector).By the difference of the first value of feedback and the second value of feedback, sphere can be obtained
Project distance change value of the object relative to radioactive source.
The variation of the distance between radioactive source and detector, can be radioactive source in the direction of the imaging surface perpendicular to detector
On, occur what relative motion generated with detector.
In the case where radioactive source is moved on the direction perpendicular to the imaging surface of detector, radioactive source is relative to spy
The distance change value for surveying device can obtain in the following manner.For example, can preassign between radioactive source and detector
Certain point is third reference point, makes radiation source movements to the position of the third reference point, obtains range sensor at this location
Third value of feedback.The third value of feedback correspond to the third reference point to detector (namely imaging surface to detector) away from
From.Next, radioactive source is made to move up to the 4th reference point in the side of the imaging surface perpendicular to detector, obtain in the position
Locate range sensor the 4th value of feedback, the 4th value of feedback correspond to the 4th reference point to detector (namely arrive detector
Imaging surface) distance.By the difference of third value of feedback and the 4th value of feedback, can obtain radioactive source relative to detector away from
From changing value, i.e., source image is away from SID changing value.
In these cases, sphere projection object can be constant with holding position, then radioactive source and sphere projection object between away from
Distance change value from changing value that is, radioactive source relative to detector；Alternatively, sphere projection object follows radioactive source to change together,
And it is remained unchanged with the distance between radioactive source.
In step 202, it is obtained at the different distance respectively, imaging of the sphere projection object in the detector
Projection imaging on face.
The projection imaging is formed by the data for projection corresponding with sphere projection object obtained of detector 20.At this
In step, at different distance of the sphere projection object relative to radioactive source, by the projection for obtaining the detector output respectively
Data, to obtain the projection imaging at above-mentioned different distance.
In step 203, according to the projection imaging and the distance change value at the different distance, determine described in put
The source image of radiation imaging system away from.
Between the distance between projection imaging and radioactive source and sphere projection object and radioactive source and the imaging surface of detector
Distance (source image away from) it is related.Sphere projects distance change of the object relative to radioactive source, causes the variation of projection imaging.?
In the case where knowing the projection imaging before and after distance change value and distance change, the source of radiation imaging system can be calculated
Image distance.
In the present embodiment, since sphere projection object has isotropic feature, thus using sphere on imaging surface
Projection can solve linear character in the prior art and be difficult to the problem parallel with imaging surface；Also, by distance change value come
Determine source image away from can be to avoid the zero point error and mechanism driving error of range sensor, to improve standard of the source image away from detection
True property.
In the present embodiment, projection imaging of the sphere projection object on the imaging surface of detector is elliptic projection, and oval
The corresponding sphere diameter projection for being parallel to imaging surface of the short axle of projection.At sphere projection object center and radioactive source focus to spy
The vertical line for surveying device imaging surface is overlapped in special circumstances, and elliptic projection is degenerated to justify, i.e., short axle is equal to long axis length.
Fig. 3 A shows a kind of radioactive source relative to the projection imaging at sphere projection object different distance.As shown in Figure 3A, exist
Initial time, it is first distance H1 that sphere, which projects the distance between object 302 and radioactive source 301,.Sphere project object 302 perpendicular to
The side of the imaging surface 303 of detector moves upwards, and the position of radioactive source 301 remains unchanged, when sphere projection object 302 move to
When the distance between radioactive source 301 is second distance H2, sphere projects object 302 relative to the distance change value of radioactive source 301 and is
ΔH.In figure 3 a, the distance between imaging surface 303 of radioactive source 301 and detector is source image away from SID, in the imaging of detector
The projection imaging of sphere projection object 302 and radioactive source 301 apart from for H2 when is shown in face 303, which is oval throwing
Shadow, short axle (length Bd2) are the projections for the sphere diameter (length B0) that sphere projection object 302 is parallel to imaging surface.Ball
The projection imaging that body projection object 302 carves at the beginning (with being H1 at a distance from radioactive source 301) is being not shown in the figure, art technology
Personnel should be appreciated that its projection imaging is similarly elliptic projection, and the short axle of the elliptic projection is also that sphere projection object 302 is flat
Row is in the projection of the sphere diameter of imaging surface.
It is being the projection imaging at H1 at a distance from radioactive source 301 for sphere convenient for distinguishing description, can be projected to object 302
Referred to as the first elliptic projection；It is being that be known as second ellipse for projection imaging at H2 at a distance from radioactive source 301 by sphere projection object 302
Circular projection.
Based on first elliptic projection, the minor axis length corresponding to it can be determined.Equally, to be described convenient for distinguishing,
The corresponding short axle of first elliptic projection can be known as the first short axle, it is short that the corresponding short axle of the second elliptic projection is known as second
Axis.
In one example, the minor axis length of elliptic projection can be determined by the following method:
Firstly, identifying the short axle of the elliptic projection namely the most short string of the elliptic projection.It is ellipse that Fig. 3 B shows second
The top view of circular projection, in figure 3b, Bd2 indicate the length of the second short axle of the second elliptic projection.
Next, calculating right angle of the short axle on the length and width direction of detector pixel array decomposes length.
Right angle, which decomposes length, can be the product of number of pixels and Pixel Dimensions.As shown in Figure 3B, short axle is corresponding in the longitudinal direction
To decompose length be Bd2x, Bd2x=pxx × nx at right angle, wherein pxx is the size on the length direction of pixel array, and nx is
The number of pixels of short axle in the longitudinal direction；Corresponding right angle decomposes length to short axle in the direction of the width is Bd2y, Bd2y=
Pxy × ny, wherein pxy is the size in the width direction of pixel array, and ny is the pixel of short axle Bd2 in the direction of the width
Number.
Length Bd2x, Bd2y is decomposed according to right angle of the short axle on length and width direction, then it is short can to calculate second
Shaft length Bd2.Its specific formula for calculation is as follows:
It can use similar method, determine the first minor axis length Bd1 corresponding to the first elliptic projection.Further come
It says, also can use interpolation algorithm, obtain the minor axis length Bd1 and Bd2 of sub-pix dimension accuracy.
First short axle be sphere projection the distance between object 302 and radioactive source 301 for H1 when, be parallel to the sphere of imaging surface
Diameter projection, the second short axle are apart from sphere diameter projection when being H2.Sphere project object 302 relative to radioactive source 301 away from
From variation, cause sphere diameter and its project between ratio variation.Before and after oneself knows distance change value, distance change
In the case where the diameter of minor axis length and sphere projection object 302, the source image of radiation imaging system can be calculated away from SID.
For projection imaging at the different distance shown in Fig. 3 A, source image can be calculated by the following method away from SID:
Due to the specific isotropic feature of sphere projection object 302, it can regard the short axle of elliptic projection as flat
Row is in the projection of the sphere diameter of imaging plane 303.Based on similar triangle theory, the ratio of sphere diameter and the second minor axis length
Value projects object 302 and 301 distance H2 of radioactive source and ratio of the source image away from SID equal to sphere, which can be known as second
Ratio.Corresponding equation is as follows:
Similarly, the ratio of sphere diameter and the first minor axis length, equal to sphere projection object 302 at a distance from radioactive source 301
The ratio can be known as the first ratio by the ratio of H1 and source image away from SID.Corresponding equation is as follows:
Have again:
| H2-H1 |=Δ H (4)
By simultaneous equations (2)-(4), expression formula of the source image away from SID can be derived are as follows:In the case where Δ H, B0, Bd1, Bd2 are all given value, then source can be calculated
The value of image distance SID.In other words, by the first ratio, the second ratio and distance change value, source image can be determined away from SID.
Fig. 4 A and Fig. 4 B show radioactive source relative to the projection imaging at detector different distance.As shown in Figure 4 A, exist
Source image between the imaging surface 303 of initial time, radioactive source 301 and detector is away from projecting object for SID1, radioactive source 301 and sphere
The distance between 302 be first distance H1, and sphere projects object 302 and is projected as the first ellipse on the imaging surface 303 of detector
Projection corresponds to the first minor axis length Bd1；.
In figure 4b, radioactive source 301 is moved upwards in the side of the imaging surface 303 perpendicular to detector, and source image is away from variation
SID2, and the position of sphere projection object 302 remains unchanged, accordingly, the distance between radioactive source 301 and sphere projection object 302
Variation is second distance H2, and sphere projects object 302 and is projected as the second elliptic projection on the imaging surface 303 of detector, corresponds to
In the second minor axis length Bd2.
In Fig. 4 A and Fig. 4 B, radioactive source 301 is relative to the distance change value of detector (imaging surface 303 of detector)
Δ H, the distance between radioactive source 301 and sphere projection object 302 changing value are similarly Δ H.
It is similar to the above, in Figure 4 A, it is based on similar triangle theory, the ratio of sphere diameter and the first minor axis length
Value can claim the ratio equal to the ratio of first distance H1 and source image away from SID1 of sphere projection object 302 and radioactive source 301
For the first ratio, corresponding equation is as follows:
In figure 4b, the ratio of sphere diameter and the second minor axis length, equal to sphere projection object 302 and radioactive source 301
The ratio can be known as the second ratio by the ratio of second distance H2 and source image away from SID2.Corresponding equation is as follows:
Have again:
| H2-H1 |=Δ H (7)
| SID2-SID1 |=Δ H (8)
By simultaneous equations (5)-(8), expression formula of the source image away from SID2 can be derived are as follows: SID2=(1-Bo/Bd1)
× Δ H/ | Bo/Bd2-Bo/Bd1 |, SID1=SID2 ± Δ H.In the case where Δ H, B0, Bd1, Bd2 are all given value, then may be used
Value of the source image away from SID1, SID2 is calculated.It in other words, can by the first ratio, the second ratio and distance change value
To determine source image away from SID1, SID2.
In another embodiment, radioactive source and sphere projection object are jointly on the direction perpendicular to the imaging surface of detector
It is moved, and the distance between radioactive source and sphere projection object are constant, can be imaged and show with reference to shown in Fig. 4 A and Fig. 4 C
It is intended to.Compared with Fig. 4 A and Fig. 4 B illustrated embodiment, difference is, in this embodiment, H2=H1.
Equation corresponding to Fig. 4 A can be as follows:
Equation corresponding to Fig. 4 C can be as follows:
Have again:
| SID2-SID1 |=Δ H (11)
Based on Fig. 3 A illustrated embodiment and the similar method of Fig. 4 A and Fig. 4 B illustrated embodiment, pass through simultaneous equations
Formula (9)-(11), it can derive SID1=| Δ H × Bd1/ (Bd2-Bd1) |, SID2=| Δ H × Bd2/ (Bd2-Bd1) |.
Each step in process shown in above-mentioned Fig. 2, execution sequence are not limited to the sequence in flow chart.In addition, each
The description of a step can be implemented as software, hardware or its form combined, for example, those skilled in the art can be by it
It is embodied as the form of software code, can is the computer executable instructions that can be realized the corresponding logic function of the step.
When it is realized in the form of software, the executable instruction be can store in memory, and by the processor in system
It executes.
Corresponding with the embodiment of foregoing source image distance detection device, present invention also provides source image device for detecting distance, source image
Embodiment away from detection device and computer readable storage medium.
It is one embodiment block diagram of the application source image device for detecting distance referring to Fig. 5, which is applied to radiation line imaging
For the source image of system away from detection device, which further includes radioactive source, detector, the apparatus may include: first obtains unit
510, the second obtaining unit 520, determination unit 530.
Wherein, first obtains unit 510 project at object or detector different distance for obtaining radioactive source relative to sphere
Distance change value；
Second obtaining unit 520, for being obtained at the different distance respectively, the sphere projection object is in the detection
Projection imaging on the imaging surface of device；
Determination unit 530, for determining institute according to the projection imaging and the distance change value at the different distance
State the source image of radiation imaging system away from.
First acquisition unit 510 is specifically used for: obtaining the radioactive source in the side of the imaging surface perpendicular to the detector
Relative motion, the distance between the generated radioactive source and sphere projection object occurs with sphere projection object upwards
Changing value；Alternatively,
The radioactive source is obtained to occur relatively on the direction of the imaging surface perpendicular to the detector with the detector
Movement, the distance between the generated radioactive source and the detector changing value.
In another embodiment, the projection imaging is elliptic projection, and the determination unit 530 is specifically used for: being determined
The minor axis length of the elliptic projection；It is thrown according to minor axis length corresponding at different distance, the distance change value and sphere
The diameter of shadow object, determine the source image away from.
It is one embodiment schematic diagram of the application source image away from detection device, the equipment application is in radioactive ray referring to Fig. 6 A
Imaging system.Some components in the radiation imaging system, such as radioactive source 610, detector 620, limit are shown in Fig. 6 A
Beam device 670.Source image of the source image of the present embodiment away from detection device for detection system is supplied to away from SID, and by SID obtained
The image processing equipment (not shown) of system, to carry out image reconstruction.
As shown in Figure 6A, which may include movement mechanism 640, range sensor 650 and MCU
(Microcontroller Unit, micro-control unit) 660.Wherein, movement mechanism 640 is for driving sphere projection object 630 to exist
It is moved upwards perpendicular to the side of the imaging surface of detector 620, range sensor 650 is for measuring sphere projection object 630 and radiation
The distance between source 610 changing value, and the distance between radioactive source 610 and detector 620 (imaging surface of detector) are kept not
Become, for fixed SID.
The structure of MCU is shown in Figure 7, including internal bus 710, and the memory connected by internal bus 710
720, processor 730 and external interface 740；Wherein, the external interface 740, for obtaining range sensor 650 and detection
The data of device 620；The memory 720 detects corresponding machine readable instructions for storage source image distance；The processor 730,
For reading the machine readable instructions on the memory, and execute following above-described source image distance detecting method.
In another embodiment, which can also include sphere fixed structure 680 away from detection device, for fixing ball
Body projects object 630, as shown in Figure 6B.The sphere fixed structure 680 is made of the material weak to radiation absorbance ability, purpose
It is the imaging surface acquisition comparison clearly sphere projection in detector.
In one example, the surrounding of the sphere fixed structure 680 is provided with sucker, to realize sphere fixed structure 680
Being stably connected between movement mechanism 640, while being easy to disassemble again.For example, can use sucker for the sphere fixed structure
680 are adsorbed on the plate for forcing of breast X-ray photographic equipment.The sucker also uses the material system weak to radiation absorbance ability
Make.
It is another embodiment schematic diagram of the application source image away from detection device referring to Fig. 6 C.In the embodiment and Fig. 6 A
Embodiment the difference is that, movement mechanism 640 is for driving radioactive source in the direction of the imaging surface perpendicular to detector 620
Upper movement, range sensor 650 is for measuring the distance between radioactive source and detector 620 changing value namely the SID as variation
SID, and sphere projection the distance between object 630 and detector 620 remain unchanged.It will be appreciated by those skilled in the art that can also
With benefit move radioactive source with other methods, however it is not limited to the above driven using movement mechanism, generation away from
From changes delta H.
In another embodiment, movement mechanism 640 for drive radioactive source 610 and sphere project object 630 perpendicular to
The side of the imaging surface of detector 620 moves upwards.
At least one embodiment of this specification additionally provides a kind of computer readable storage medium, is stored thereon with computer
Program realizes source image distance detecting method described in this specification any embodiment when described program is executed by processor.
In the embodiment of the present application, computer readable storage medium can be diversified forms, for example, in different examples
In, the machine readable storage medium may is that RAM (Radom Access Memory, random access memory), volatile deposit
Reservoir, nonvolatile memory, flash memory, memory driver (such as hard disk drive), solid state hard disk, any kind of storage dish
(such as CD, dvd) perhaps similar storage medium or their combination.Special, described computer-readable medium
Can also be paper or other be suitably capable of the medium of print routine.Using these media, these programs can be passed through
The mode of electricity gets (for example, optical scanner), can be compiled, be explained and processing in an appropriate manner, then can be by
It stores in computer media.
The foregoing is merely the preferred embodiments of the application, not to limit the application, all essences in the application
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the application protection.
Claims (10)
1. a kind of source image distance detecting method, which is characterized in that the source image applied to radiation imaging system is described away from detection device
System further includes radioactive source, detector, which comprises
Radioactive source is obtained relative to the distance change value at sphere projection object or detector different distance；
It is obtained at the different distance respectively, projection imaging of the sphere projection object on the imaging surface of the detector；
According to the projection imaging and the distance change value at the different distance, the source of the radiation imaging system is determined
Image distance.
2. projecting object or detector not relative to sphere the method according to claim 1, wherein obtaining radioactive source
Distance change value at same distance, comprising:
The radioactive source is obtained to occur relatively on the direction of the imaging surface perpendicular to the detector with sphere projection object
Movement, the distance between the generated radioactive source and the sphere projection object changing value；Alternatively,
It obtains the radioactive source and relative motion occurs with the detector on the direction of the imaging surface perpendicular to the detector,
The distance between the generated radioactive source and the detector changing value.
3. method according to claim 1 or 2, which is characterized in that the projection imaging be elliptic projection, according to it is described not
Projection imaging and the distance change value at same distance, determine the source image of the radiation imaging system away from, comprising:
Determine the minor axis length of the elliptic projection；
The diameter that object is projected according to minor axis length, the distance change value and the sphere at different distance, determines the source image
Away from.
4. according to the method described in claim 3, it is characterized in that, determining the minor axis length of the elliptic projection, comprising:
Identify the short axle of the elliptic projection；
It calculates right angle of the short axle on the length and width direction of detector pixel array and decomposes length；
Length is decomposed according to right angle of the short axle on the length and width direction of detector pixel array, it is long to calculate short axle
Degree.
5. according to the method described in claim 3, it is characterized in that, the radioactive source projects object or detector relative to sphere
Different distance includes first distance and second distance, and the minor axis length includes and the first distance and the second distance pair
The first minor axis length and the second minor axis length answered, according to minor axis length, the distance change value and the ball at different distance
Body project object diameter, determine the source image away from, comprising:
According to the sphere project object diameter and first minor axis length, determine the first distance and the source image away from
First ratio；
According to the sphere project object diameter and second minor axis length, determine the second distance and the source image away from
Second ratio；
According to first ratio, second ratio and the distance change value, determine the source image away from.
6. a kind of source image device for detecting distance, which is characterized in that the source image applied to radiation imaging system is described away from detection device
System further includes radioactive source, detector, and described device includes:
First acquisition unit, for obtaining radioactive source relative to the distance change at sphere projection object or detector different distance
Value；
Second acquisition unit, for being obtained at the different distance respectively, sphere projection object the detector at
Projection imaging in image planes；
Determination unit, for determining the radiation according to the projection imaging and the distance change value at the different distance
The source image of line imaging system away from.
7. device according to claim 6, which is characterized in that the first acquisition unit is specifically used for:
The radioactive source is obtained to occur relatively on the direction of the imaging surface perpendicular to the detector with sphere projection object
Movement, the distance between the generated radioactive source and the sphere projection object changing value；Alternatively,
It obtains the radioactive source and relative motion occurs with the detector on the direction of the imaging surface perpendicular to the detector,
The distance between the generated radioactive source and the detector changing value.
8. device according to claim 7, which is characterized in that the projection imaging is elliptic projection, the determination unit
It is specifically used for:
Determine the minor axis length of the elliptic projection；
According to minor axis length corresponding at different distance, the distance change value and sphere project object diameter, determine described in
Source image away from.
9. a kind of source image is away from detection device, which is characterized in that be applied to radiation imaging system, the radiation imaging system is also
Including radioactive source, detector, the equipment includes movement mechanism, range sensor and MCU, in which:
The movement mechanism is for driving sphere projection object and/or radioactive source or detector in the imaging perpendicular to the detector
The side in face moves upwards；
The range sensor for measure the radioactive source and the sphere projection object between and the radioactive source with it is described
The distance between detector changing value；
The MCU includes: internal bus, and the memory, processor and the external interface that are connected by internal bus；Wherein,
The external interface, for obtaining the data of the range sensor and detector；
The memory detects corresponding machine readable instructions for storage source image distance；
The processor for reading the machine readable instructions on the memory, and executes and is based on claim 1 to 5
Any one of described in method.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that described program is processed
Device realizes method described in any one of claims 1 to 5 when executing.
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