CN104605872B - A kind of launched field control method and device of medical X-ray system - Google Patents
A kind of launched field control method and device of medical X-ray system Download PDFInfo
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- CN104605872B CN104605872B CN201410851522.2A CN201410851522A CN104605872B CN 104605872 B CN104605872 B CN 104605872B CN 201410851522 A CN201410851522 A CN 201410851522A CN 104605872 B CN104605872 B CN 104605872B
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Abstract
Presently filed embodiment provides the launched field control method and device of a kind of medical X-ray system.This method includes：Obtain positional information of the true light chopper in beam-defining clipper in physical coordinates system；According to the coordinate transformation relation between physical coordinates system and launched field coordinate system and between launched field coordinate system and image coordinate system, the positional information of true light chopper is transformed into image coordinate system and forms virtual light chopper, the plane where the launched field coordinate system is the plane where x-ray receiver；Virtual light chopper and the end-frame image that is obtained in spot film photograph are synthesized, the result after synthesis is shown in control mode；The target location that true light chopper is moved is determined according to the operation information to control, controls true light chopper to be moved to target location to realize the launched field control to medical X-ray system.Presently filed embodiment can relatively accurately realize the positioning to interest region.
Description
Technical field
Embodiments of the present invention are related to medical X-ray technical field, more particularly to a kind of launched field of medical X-ray system is controlled
Method and its device.
Background technology
Inspection, the treatment medically extensive use of disease are carried out using X-ray (or " x-ray ").But, typically recognize
For infringement may be brought to human body by excessively receiving x-ray, therefore, and coherence check, the mistake treated are being carried out using medical X-ray system
Cheng Zhong, irradiation of the X-ray beam to patient or associated medical person should be reduced as far as possible.Therefore, medical X-ray system (such as, medical number
Word X-ray examination camera chain) usually through " launched field " of the device to X-ray beam for being referred to as beam-defining clipper (Collimator) using one
It is controlled, so that only irradiation doctor region (ROI, Region Of Interest) interested, it is to avoid patient is unnecessary by line.
Beam-defining clipper device generally includes multiple light choppers, and the window being exactly based on to this multiple light chopper formation is controlled to " launched field "
Size be adjusted and realize.
In the prior art, a kind of method of adjustment beam-defining clipper (light chopper) control " launched field " is doctor's (x-ray at close-table
At system) combine the situation of " launched field indicator lamp " on beam-defining clipper and be adjusted.But, because x-ray system is located at radiation chamber, use
This mode necessarily requires doctor to enter radiation chamber and carries out close-table operation, then returns workbench, on the one hand utilizes X to doctor
Linear system system, which carries out diagnosis and treatment, makes troubles, and on the other hand doctor may be made to touch X-ray beam, cause unnecessary harm.To overcome
These defects, occur in that a kind of doctor adjusts the way of beam-defining clipper in control room at a distance again, make doctor need not close-table operation.But
It is, this far distance controlled beam-defining clipper that generally can not observe the launched field situation of change before and after beam-defining clipper regulation well, cause
Positioning to interest region is inaccurate, causes the possibility for carrying out X-ray beam perspective again.
In addition, it is necessary to carry out " spot film photograph " in existing X-ray examination, and the usual way of " spot film photograph " is doctor
First selection needs the area-of-interest of exposure photography, then in the case where keeping X-ray examination unwrapping wire state, adjusts beam-defining clipper to observe screening
The location status of line device and ROI, is finally just exposed IMAQ.This way makes patient one during adjustment beam-defining clipper
It is straight to be in by " line " state, cause patient to receive unnecessary radiation.Meanwhile, which also reduces operating efficiency and set
Standby service life.
The content of the invention
In order to solve the above problems, the application embodiment provide a kind of medical X-ray system launched field control method and
Its device, to improve the positional accuracy to interest region, reduces the possibility of unnecessary X-ray beam perspective.
The launched field control method for the medical X-ray system that the application embodiment is provided includes：
Obtain positional information of the true light chopper in beam-defining clipper in physical coordinates system；
Turned according to the coordinate between physical coordinates system and launched field coordinate system and between launched field coordinate system and image coordinate system
Relation is changed, the positional information of true light chopper is transformed into image coordinate system and forms virtual light chopper, the launched field coordinate system
The plane at place is the plane where x-ray receiver；
Virtual light chopper and the end-frame image that is obtained in spot film photograph are synthesized, by the result after synthesis with control side
Formula is shown；
The target location that true light chopper is moved is determined according to the operation information to control, controls true light chopper to be moved to
Target location is to realize to the control of the launched field of medical X-ray system.
Preferably, the physical coordinates system is the intersection point with the plane where true light chopper and the extended line of x-ray focus
For the coordinate system of origin, the launched field coordinate system is that the intersection point of plane where x-ray receiver and the extended line of x-ray focus is former
The coordinate system of point, the origin of described image coordinate system is in the plane where the launched field coordinate system.
Preferably, the plane where the physical coordinates system is parallel to each other with the plane where the launched field coordinate system, institute
State the origin that subpoint of the origin of physical coordinates system in launched field coordinate system is launched field coordinate system, the launched field coordinate system place
Plane and described image coordinate system where plane be approximately the same plane, then：
Postulated point (x0, y0) is the point that physical coordinates are fastened, and point (x0 ', y0 ') is point (x0, y0) in launched field coordinate
The subpoint fastened, then the coordinate transformation relation between physical coordinates system and launched field coordinate system be：
Wherein：Scale is that physical coordinates are tied to the conversion coefficient of launched field coordinate system, and Scale value is equal to x-ray focus to penetrating
The ratio of distances constant of the distance of wild coordinate plane and x-ray focus to physical coordinates system plane；
Postulated point (x0 ', y0 ') is a point on launched field coordinate system, and point (x1, y1) is that point (x0 ', y0 ') is sat in image
The corresponding points fastened are marked, then the coordinate transformation relation between launched field coordinate system and image coordinate system is：
Wherein：Point (a, b) fastens corresponding pixel coordinate point for the origin of coordinates of launched field coordinate system in image coordinate,
PixelWidth and PixelHeight is respectively the wide and height of image pixel dimensions.
Preferably, the true light chopper in the beam-defining clipper includes two horizontal light choppers and two vertical light choppers, institute
The open area that horizontal light chopper is surrounded with vertical light chopper is stated, then：
PixelWidth=xWidth1/2a
PixelHeight=yWidth1/2b
Wherein：XWidth1 is the maximum open width between two horizontal light choppers on launched field coordinate system, yWidth1
For between two vertical light choppers on launched field coordinate maximum open width.
Preferably, the operation information to control includes moving left and right, to imaginary vertical to dummy level light chopper
The open area for moving up and down and being surrounded to dummy level light chopper and imaginary vertical light chopper of light chopper zooms in and out shifting
It is dynamic.
Preferably, it is described virtual light chopper and the image that is obtained in spot film photograph are subjected to synthesis to specifically include：
The end-frame image obtained in spot film photograph is plotted in the first figure layer；
First figure layer is copied in the second figure layer, then virtual light chopper is plotted in second figure layer；
Second figure layer is plotted in the figure layer of interface.
Preferably, the result by after synthesis with control mode show including：
Result after synthesis is transformed into by control according to the coordinate transformation relation between image coordinate system and control coordinate system
Shown in coordinate system in control mode, plane where the control coordinate system is the plane where control.
Embodiment further provides a kind of launched field control device of medical X-ray system by the application.The device includes：Information is obtained
Unit, coordinate transformation unit, image composing unit and control unit are taken, wherein：
Described information acquiring unit, for obtaining position letter of the true light chopper in beam-defining clipper in physical coordinates system
Breath；
The coordinate transformation unit, for according between physical coordinates system and launched field coordinate system and launched field coordinate system with figure
As the coordinate transformation relation between coordinate system, the positional information of true light chopper is transformed into image coordinate system and forms virtual hide
Line device, the plane where the launched field coordinate system is the plane where x-ray receiver；
Described image synthesis unit, for virtual light chopper and the end-frame image that is obtained in spot film photograph to be synthesized,
Result after synthesis is shown in control mode；
Described control unit, the target location for determining true light chopper movement according to the operation information to control, control
True light chopper is made to be moved to target location to realize the launched field control to medical X-ray system.
Preferably, the physical coordinates system is the intersection point with the plane where true light chopper and the extended line of x-ray focus
For the coordinate system of origin, the launched field coordinate system is that the intersection point of plane where x-ray receiver and the extended line of x-ray focus is former
The coordinate system of point, the origin of described image coordinate system is in the plane where the launched field coordinate system.
Preferably, the plane where the physical coordinates system is parallel to each other with the plane where the launched field coordinate system, institute
State the origin that subpoint of the origin of physical coordinates system in launched field coordinate system is launched field coordinate system, the launched field coordinate system place
Plane and described image coordinate system where plane be approximately the same plane, then：Postulated point (x0, y0) is what physical coordinates were fastened
One point, point (x0 ', y0 ') is subpoint of the point (x0, y0) on launched field coordinate system, then physical coordinates system and launched field coordinate system
Between coordinate transformation relation be：
Wherein：Scale is that physical coordinates are tied to the conversion coefficient of launched field coordinate system, and Scale value is equal to x-ray focus to penetrating
The ratio of distances constant of the distance of wild coordinate plane and x-ray focus to physical coordinates system plane；
Postulated point (x0 ', y0 ') is a point on launched field coordinate system, and point (x1, y1) is that point (x0 ', y0 ') is sat in image
The corresponding points fastened are marked, then the coordinate transformation relation between launched field coordinate system and image coordinate system is：
Wherein：Point (a, b) fastens corresponding pixel coordinate point for the origin of coordinates of launched field coordinate system in image coordinate,
PixelWidth and PixelHeight is respectively the wide and height of image pixel dimensions.
Preferably, described image synthesis unit includes the first drafting subelement, the second drafting subelement and the 3rd drafting
Subelement, wherein：
Described first draws subelement, for the end-frame image obtained in spot film photograph to be plotted in into the first figure layer；
Described second draws subelement, for copying the first figure layer to second figure layer, then virtual light chopper is drawn
Onto second figure layer；
The display subelement, for the second figure layer to be plotted into interface figure layer.
The application embodiment first obtains the positional information of true light chopper, utilizes the Coordinate Conversion between various coordinate systems
The positional information is transformed into image coordinate system to form virtual light chopper by relation, by virtual light chopper with being obtained in spot film photograph
The end-frame image taken synthesizes virtual image, is then shown in control mode, and then is realized by the operation to control
Regulation to true light chopper, reaches the control to coverage field.Compared with prior art, the application embodiment passes through very
Real light chopper is converted to visual virtual light chopper, and is reached by the regulation to visual virtual light chopper to true
The regulation of light chopper, this mode can make doctor that the control to true light chopper only can be achieved in control room, and can
Control process is clearly observed, so as to control coverage field exactly, and then interest region is accurately positioned, is reduced
Unnecessary X-ray beam perspective.In addition, the application embodiment can need not be constantly in patient during control launched field
By " line " state, so as to avoid patient by unnecessary x-ray radiation.
Brief description of the drawings
Detailed description below, above-mentioned and other mesh of exemplary embodiment of the invention are read by reference to accompanying drawing
, feature and advantage will become prone to understand.In the accompanying drawings, if showing the present invention's by way of example, and not by way of limitation
Dry embodiment, wherein：
Fig. 1 is one embodiment flow chart of the launched field control method of medical X-ray system；
Fig. 2 is the light chopper schematic diagram set in a kind of beam-defining clipper；
Fig. 3 is the schematic diagram of relation between several coordinate systems that the application is related to；
Fig. 4 a are another embodiment flow chart of the launched field control method of medical X-ray system；
Fig. 4 b are the positional information schematic diagram for the light chopper that Fig. 4 a illustrated embodiments are related to；
Fig. 5 is control graphic layer structure schematic diagram；
Fig. 6 a~6c is the schematic diagram operated using mouse to control；
Fig. 7 a~7c is the schematic diagram operated using touch-screen to control；
Fig. 8 is the schematic diagram operated using stylus to control；
Fig. 9 a~9d is the schematic diagram before and after light chopper is adjusted；
Figure 10 is the structured flowchart of one embodiment of the launched field control device of medical X-ray system.
Embodiment
The principle and spirit of the present invention is described below with reference to some illustrative embodiments.It should be appreciated that providing this
A little embodiments are used for the purpose of better understood when those skilled in the art and then realizing the present invention, and not with any
Mode limits the scope of the present invention.On the contrary, these embodiments are provided so that the disclosure is more thorough and complete, and energy
It is enough that the scope of the present disclosure is intactly conveyed into those skilled in the art.
Referring to Fig. 1, the figure shows a kind of launched field control method embodiment of medical X-ray system of the application, (first is real
Apply example) flow chart, the flow of the embodiment includes：
Step S11：Obtain positional information of the true light chopper in beam-defining clipper in physical coordinates system；
As it was previously stated, light chopper, which is beam-defining clipper, realizes the adjusting part controlled launched field, it is generally the case that light chopper can
To show as template elongate in shape, the scope of launched field is changed by the way that the template elongate in shape is moved., should referring to Fig. 2
Figure shows the light chopper facilities in a kind of limiter of speed, four light choppers shown in this figure, including two vertical hide
Line device I (respectively positioned at the upper side and lower side) and two horizontal light chopper II (respectively positioned at left side and right side), this four light choppers
(i.e. the right of the upside lower edge of light chopper, the upper edge of downside light chopper and left side light chopper is along, right side shade line for inside edge
The left margin of device) open area is surrounded, control the size i.e. achievable control to coverage field of the open area.At this
, can be flat where light chopper using the central point of above-mentioned open area as the origin of coordinates in a kind of light chopper set-up mode of sample
Face is coordinate plane, builds a physical coordinates system, the coordinate position of each light chopper in the coordinate system is light chopper
Positional information.
There is also the need to illustrate some：One is the quantity on light chopper.Four are shown in the schematic diagram shown in Fig. 2
Light chopper, then this positional information of four light choppers in physical coordinates system can be obtained respectively, these information are then utilized
Subsequent treatment is carried out, still, this is not meant to must be provided with four light choppers in this application and must be while obtaining four
The positional information of light chopper, in fact, in order to reach the purpose being controlled to field size, at least one shade line can be set
Device, and realized by changing the position of at least one light chopper, under this situation, the application can be utilized only to one
Light chopper and obtain positional information of the light chopper in physical coordinates system.Same reason, obtains two or other numbers
The physical location of the light chopper of amount can realize present invention purpose.Two be on light chopper " true and false ".Above-mentioned
Light chopper is limited with " true " in step, this is primarily to be easy to the language mutually distinguished and made with follow-up " virtual " light chopper
Conversion on speech, typically, " true light chopper " refer to the light chopper present in real world (or being physical world),
" virtual light chopper " refers to the light chopper of the Image Creation showed in digitized information equipment (such as, computer).Three are
On physical coordinates system." physical coordinates system " is set to be easy for determining the position letter of true light chopper in the application embodiment
Breath, as long as in fact there is the presence of coordinate system, just can weigh the position of light chopper, that is to say, that the application couple with quantification
Which physical coordinates system put as origin using in itself, which direction is X-axis, Y-axis and need not be particularly limited.Certainly, upper
State in the open area surrounded by four light choppers referred to, using the central point of open area as the origin of coordinates, with light chopper institute
Plane for coordinate plane be a kind of suitable selection, this setting means to physical coordinates system and will subsequently refer to
Other coordinate systems are suitably arranged in pairs or groups, then can play a part of simplified operation.
Step S12：According between physical coordinates system and launched field coordinate system and between launched field coordinate system and image coordinate system
Coordinate transformation relation, the positional information of true light chopper is transformed into image coordinate system and forms virtual light chopper, it is described to penetrate
Plane where wild coordinate system is the plane where x-ray receiver；
Step S13：Virtual light chopper and the end-frame image that is obtained in spot film photograph are synthesized, by the result after synthesis
Shown in control mode；
Step S14：The target location that true light chopper is moved is determined according to the operation information to control, true shade line is controlled
Device is moved to target location to realize the launched field control to medical X-ray system；
After virtual light chopper is shown in control mode, doctor can be on a display panel using end-frame image as reference pair control
Part carries out various operations, such as, and left and right is carried out to the virtual light chopper in control or is moved up and down, or by multiple light choppers
In the case of surrounding open area, the overall scaling movement of coverage field is carried out.It can be determined virtually according to these operation informations
The position of light chopper movement, and then can determine that true light chopper needs the target location being moved to, then control related set
It is standby to drive true light chopper to be moved to target location, so that final just realize the launched field control to medical X-ray system.In adjustment
Go out after suitable coverage field, can be exposed in coverage field, to collect the image of needs.
The positional information of true light chopper is first obtained in the above-described embodiment, is turned using the coordinate between various coordinate systems
Change relation the positional information to be transformed into image coordinate system to form virtual light chopper, by virtual light chopper and spot film photograph
Shown after the end-frame image synthesis of acquisition in control mode, and then by realizing the tune to light chopper to the operation of control
Section, reaches the control to launched field.Compared with prior art, the application embodiment can at least obtain following technique effect：
(1) true light chopper is converted to by visual virtual light chopper by the above-mentioned embodiment of the application, by right
The regulation of visual virtual light chopper can reach the regulation to true light chopper, so that doctor can be only in control room
Virtual light chopper just can realize the control to coverage field on operation display board, without to being operated on the spot at close-table,
It is convenient to be provided for doctor, it also avoid doctor and excessively touches x-ray.
(2) because the light chopper by virtualization can be visually displayed in face of doctor, doctor is in operational controls with reality
When adjustment light chopper during can in real time observe coverage field change, so as to relatively accurately to region of interest
Positioning is realized in domain, reduces and unnecessary X-ray beam perspective is carried out to patient.
(3) the above-mentioned embodiment of the application is closed virtual light chopper and the end-frame image that is obtained in spot film photograph
Into doctor in this course, be able to can be terminated to irradiation pair using " last frame " image as with reference to area-of-interest is accurately positioned
As the irradiation of (such as, patient) progress x-ray, and Correct exposure is carried out again after coverage field is adjusted, so that in launched field control
Patient is no longer on by " line " state during system, and then avoid patient by unnecessary x-ray radiation.
Physical coordinates system, launched field coordinate system and image are referred in the step S12 of above-mentioned embodiment (first embodiment)
Relation between several coordinate systems such as coordinate system, these coordinate systems can be presented as various concrete forms, such as, will
Physical coordinates system is defined as the intersection point of the extended line using the plane where true light chopper Yu x-ray focus as the coordinate system of origin,
Launched field coordinate system is that the intersection point of plane where x-ray receiver and the extended line of x-ray focus is the coordinate system of origin, described image
The origin of coordinate system is in the plane where the launched field coordinate system.Complicated journey of the different relations when carrying out Coordinate Conversion
Degree there may be difference, still, no matter which kind of concrete form, only carry out coordinate transform process between coordinate system it is different and
, and without prejudice to by a kind of coordinate be tied to another coordinate system between correct conversion (mapping).In actual application, this
Application can be preferred to use the coordinate system system shown in Fig. 3.In the figure, uppermost point is x-ray focus, and X-ray beam is from there
Project, the seat where first plane (observing from top to bottom) in the spot projection to (or the x-ray projected from x-ray focus is mapped to)
Mark system is that the square frame in physical coordinates system, coordinate system represents the coverage field that multiple (being 4 in figure) light choppers are surrounded, the coordinate
The origin of coordinates of system is X-ray beam and the intersection point of plane where light chopper, and the unit of coordinate system can be using milli in the coordinate system
Rice (mm) magnitude.Second plane that x-ray focus projection is arrived is launched field coordinate system, and the plane where launched field coordinate system is usually X
Plane where line receiver, coordinate system unit can also use millimeter (mm) magnitude in launched field coordinate system.3rd coordinate
System is image coordinate system, and the plane where the image coordinate system is flat for identical with the plane where launched field coordinate system in figure 3
Face.There can be certain angle between plane where these coordinate systems, parallel relation can also be shown as (in such as Fig. 3
It is shown), when being presented as certain angle, corresponding transformational relation can be taken to be transformed into the point in a coordinate system another
Among individual coordinate system.It is parallel relation by several plane sets following for the convenience of discussion.On this basis, can have
Body is drawn between physical coordinates system and launched field coordinate system, the coordinate transformation relation between launched field coordinate system and image coordinate system.
It is assumed here that point (x0, y0) is the point that physical coordinates are fastened, point (x0 ', y0 ') is point (x0, y0) in launched field
Subpoint on coordinate system, then the coordinate transformation relation between physical coordinates system and launched field coordinate system be：
Wherein：Scale is conversion coefficient between physical coordinates system and launched field coordinate system, and its value is equal to x-ray focus to penetrating
The distance of the distance (SID as shown in Figure 3) of plane and plane where x-ray focus to physical coordinates system where wild coordinate system
The ratio between (D1 as shown in Figure 3).
Postulated point (x1, y1) is that the subpoint that point (x0 ', y0 ') is fastened in image coordinate, then launched field coordinate system and image are sat
Mark system between coordinate transformation relation be：
Wherein：The pixel coordinate that point (a, b) is fastened for the origin of coordinates of launched field coordinate system in image coordinate, PixelWidth
It is respectively the wide and height of image pixel dimensions with PixelHeight.
On the basis of the coordinate transformation relation being discussed in detail between several coordinate systems, closed with reference to this Coordinate Conversion
System and the shown light choppers set of Fig. 2, which are provided, can annotate a more detailed example (second of technical scheme
Embodiment).Referring to Fig. 4 a, the figure shows the flow of the example, the flow includes：
Step S41：Obtain positional information of the true light chopper in beam-defining clipper in physical coordinates system；
The position coordinates that physical coordinates system according to Fig. 3 can obtain four light choppers is respectively (note：Here it is side
Just illustrate, only by taking the edge coordinate of light chopper as an example, referring to Fig. 4 b)：
The horizontal light chopper in left side is right along abscissa：H_lPos0=-H_lPhyPos；
The horizontal light chopper in right side is left along abscissa：H_rPos0=H_rPhyPos；
Along ordinate under upper vertical light chopper：V_uPos0=V_uPhyPos；
Along ordinate on lower vertical light chopper：V_dPos0=-V_dPhyPos.
Step S42：According to the coordinate transformation relation between physical coordinates system and launched field coordinate system by the position of true light chopper
Confidence breath is transformed into launched field coordinate system；
As it was previously stated, the coordinate transformation relation between physical coordinates system and launched field coordinate system can be presented as following public affairs
Formula：
Positional information of the true light chopper in launched field coordinate system can be obtained according to above-mentioned coordinate transformation relation：
The horizontal light chopper in left side is right along abscissa：H_lPos0 '=Scale × H_lPos0；
The horizontal light chopper in right side is left along abscissa：H_rPos0 '=Scale × H_rPos0；
Along ordinate under upper vertical light chopper：V_uPos0 '=Scale × V_uPos0；
Along ordinate on lower vertical light chopper：V_dPos0 '=Scale × V_dPos0.
Step S43：True light chopper is being penetrated according to the coordinate transformation relation between launched field coordinate system and image coordinate system
Positional information under wild coordinate system, which is transformed into image coordinate system, forms virtual light chopper；
As it was previously stated, the coordinate transformation relation between launched field coordinate system and image coordinate system can be presented as following public affairs
Formula：
Positional information of the true light chopper in image coordinate system can be obtained according to above-mentioned coordinate transformation relation：
The horizontal light chopper in left side is right along abscissa：
H_lPos1=a+Scale × H_lPos0/PixelWidth；
The horizontal light chopper in right side is left along abscissa：
H_rPos1=a+Scale × H_rPos0/PixelWidth；
Along ordinate under upper vertical light chopper：
V_uPos1=b-Scale × V_uPos0/PixelHeight；
Along ordinate on lower vertical light chopper：
V_dPos1=b-Scale × V_dPos0/PixelHeight.
Step S44：Virtual light chopper and the end-frame image that is obtained in spot film photograph are synthesized, by the result after synthesis
Shown in control mode；
Here directly control can be included in image coordinate system, but in actual application, it is contemplated that image is sat
Mark system in view of the situation, can may again set one with finally showing that it is uncoordinated in ratio that the device screen of control be present
Individual control coordinate system.Shown in Figure 3, undermost coordinate system is control coordinate system, in figure 3, where control coordinate system
Plane be finally show virtual light chopper synthesized with end-frame image after composite result display plane, the original of the coordinate system
Point using the upper left corner of virtual light chopper open area as origin, under this situation, it is assumed that point (x2, y2) be control coordinate system in
, then there is following coordinate between image coordinate system and control coordinate system and turn in the corresponding point of point (x1, y1) in image coordinate system
Change and transfer from one department to another：
In formula：Scale ' is display image scaling rate, represents the conversion coefficient of image coordinate system and control coordinate system.In void
The virtual coverage field size for intending light chopper formation is that (unit can be mm to 2A × 2B2) in the case of, due to picture size and
The wide high proportion of the virtual coverage field size of control is identical, therefore, and Scale ' value can be determined in the following manner：
Scale '=A/a, or
Scale '=B/b
Virtual light chopper can be obtained in control according to the transformational relation between above-mentioned image coordinate system and control coordinate system
Positional information in coordinate system：
The horizontal light chopper in left side is right along abscissa：
H_lPos2=Scale ' × (a+Scale × H_lPos0/PixelWidth)；
The horizontal light chopper in right side is left along abscissa：
H_rPos2=Scale ' × (a+Scale × H_rPos0/PixelWidth)；
Along ordinate under upper vertical light chopper：
V_uPos2=Scale ' × (b-Scale × V_uPos0/PixelHeight)；
Along ordinate on lower vertical light chopper：
V_dPos2=Scale ' × (b-Scale × V_dPos0/PixelHeight).
Step S45：The target location that true light chopper is moved is determined according to the operation information to control, true shade line is controlled
Device is moved to target location to realize the launched field control to medical X-ray system.
Being mentioned in the step 13 of above-mentioned embodiment (first embodiment) needs to synthesize image.Synthesis can be adopted
Various ways are taken to realize, the application in order that display content become apparent from, display efficiency it is higher, designed using figure layer thought
Synthesize display process.Referring to Fig. 5, the figure shows graphic layer structure, in the figure including four figure layers, nethermost figure layer (this
In be referred to as " lower figure layer ") be Background From Layer (Background Overlay), for display background color (in this figure be black)；
First figure layer (that figure layer i.e. on " lower figure layer ") is image layer (Image Overlay), for display image, than
Such as, in spot film photograph end-frame image, final exposure image etc.；Second figure layer (i.e. that figure layer above the first figure layer) is
Light chopper figure layer (Shutter Overlay), the positional information for showing light chopper is translucent in the intermediate region of figure layer
Region, to observe the image in figure layer below；Uppermost figure layer (referred to herein as " upper figure layer ") is information figure layer
(Information Overlay), for showing reference line or other temporary informations.In these figure layers, upper and lower figure layer master
To be set for the effect of two figure layers in the middle of strengthening, in some cases, can be without using the two figure layers.Thus, utilize
First figure layer, the second figure layer realize that the building-up process of the end-frame image obtained in virtual light chopper and spot film photograph can be so
's：First the end-frame image obtained in spot film photograph is plotted in the first figure layer, then the first figure layer is copied to second figure layer
On, then virtual light chopper is plotted in second figure layer, finally the second figure layer is plotted in the figure layer of interface.Certainly, if
Need to draw " upper figure layer ", then reason is similar, i.e., copy the second figure layer in " upper figure layer " to, then draw the reference of selection region
Line and some other temporary informations.By using the design philosophy of this figure layer, when some figure layer changes above, only need
The figure layer above that figure layer and its changed is redrawn, so as to improve display efficiency.
Referred in the step 14 of above-mentioned embodiment (first embodiment) and control is operated, actual application
In, the operation of diversified forms can be carried out using a variety of operation instruments.As it is foregoing refer to moved left and right on the touchscreen,
Move up and down or scale and be mobile etc..For the ease of the clearer technical scheme for understanding the application, separately below with using mouse,
Three kinds of instruments of touch-screen and stylus carry out various forms of operations to control and illustrated for example：
One of exemplary approach：Various forms of operations are carried out to control using mouse
Referring to Fig. 6, the figure shows to single light chopper (Fig. 6 a), two adjacent light choppers (Fig. 6 b) and 4 shade lines
The process (Fig. 6 c) that device is operated.The situation operated for single light chopper, as shown in Figure 6 a, need to only move mouse
To virtual light chopper edge (referring to first subgraph), when pointer is changed into(being positioned on vertical light chopper) or
When (being positioned on horizontal light chopper), press left mouse button and drag virtual light chopper (referring to second subgraph), unclamp left button
Afterwards, corresponding actual physics light chopper (i.e. true light chopper) will move to relevant position (referring to the 3rd subgraph).For
The situation that two adjacent light choppers (vertical a light chopper and a horizontal light chopper) are operated simultaneously, such as Fig. 6 b institutes
Show, when mouse is moved to the intersection point at adjacent virtual light chopper edge (referring to first subgraph), pointer can be changed intoOrNow press left mouse button and drag light chopper to specified location (referring to second subgraph), unclamp after left button, corresponding two
Individual actual physics light chopper will move to relevant position (referring to the 3rd subgraph).For (limiting four light choppers simultaneously
Beam device launched field is translated) situation that is operated, as fig. 6 c, when mouse is moved in open area (referring to first son
Figure), pointer can be changed intoNow press left mouse button and drag launched field to specified location (referring to second subgraph), unclamp left
After key, actual physics light chopper will move to relevant position (referring to the 3rd subgraph).
The two of exemplary approach：Various forms of operations are carried out to control using touch-screen
Referring to Fig. 7, the figure shows to single light chopper (Fig. 7 a), two adjacent light choppers (Fig. 7 b) and 4 shade lines
The process (Fig. 7 c) that device is operated.The situation operated for single light chopper, as shown in Figure 7a, only need to touch virtual screening
The edge (referring to first subgraph) of line device, and specified location (referring to second subgraph) is dragged to, corresponding actual physics hide
Line device will move to relevant position (referring to the 3rd subgraph).For to two adjacent light choppers (a vertical light chopper with
One horizontal light chopper) situation that is operated, as shown in Figure 7b, the intersection point at adjacent virtual light chopper edge only need to be touched, and
Specified location (referring to second subgraph) is dragged to, corresponding actual physics light chopper will move to relevant position (referring to
Three subgraphs).For the situation operated to four light choppers (i.e. beam-defining clipper launched field translate) simultaneously, as shown in Figure 7 c,
Open area need to be touched, and drags open area to specified location (referring to second subgraph), actual physics light chopper will be put down
Move on to relevant position (referring to the 3rd subgraph).
The three of exemplary approach：Various forms of operations are carried out using stylus control
Referring to Fig. 8, only new launched field rectangular area need to be taken using touch-control stroke in the coverage field of display control, it is right
The actual physics light chopper answered will move to relevant position.
As it was previously stated, by being operated to the virtual light chopper control on screen, it is possible to achieve to true light chopper position
The adjustment put, so as to be controlled to coverage field.Assuming that carrying out spot film photograph gets last frame (last frame) image and screening
Shown in position display Fig. 9 a of line device, then manipulate, just can obtain according to any one of foregoing three kinds of operational controls mode
New light chopper position as shown in figure 9b and new coverage field size.On this basis, it can again be exposed, be obtained
The image (as is shown in fig. 9 c) finally needed is obtained, then to it meet the processing of various needs, than putting as shown in figure 9d
Big processing.
The above describes the various embodiments of the method for the launched field control of the medical X-ray system of the application in detail, with
This similarly, present invention also provides the embodiment of the launched field control device of medical X-ray system.Referring to Figure 10, this is illustrated
The composition structured flowchart of one embodiment of the launched field control device of the medical X-ray system of the application.The embodiment includes：Letter
Acquiring unit U101, coordinate transformation unit U102, image composing unit U103 and control unit U104 are ceased, wherein：
Information acquisition unit U101, for obtaining position letter of the true light chopper in beam-defining clipper in physical coordinates system
Breath；
Coordinate transformation unit U102, for according between physical coordinates system and launched field coordinate system and launched field coordinate system with figure
As the coordinate transformation relation between coordinate system, the positional information of true light chopper is transformed into image coordinate system and forms virtual hide
Line device, the plane where the launched field coordinate system is with the plane of the object contact of x-ray to be illuminated；
Image composing unit U103, for virtual light chopper and the end-frame image that is obtained in spot film photograph to be synthesized,
Result after synthesis is shown in control mode；
Control unit U104, the target location for determining true light chopper movement according to the operation information to control, control
True light chopper is made to be moved to target location to realize the launched field control to medical X-ray system.
The course of work of said apparatus embodiment is：The true light chopper that information acquisition unit U101 is obtained in beam-defining clipper exists
Positional information in physical coordinates system, then by coordinate transformation unit U102 according between physical coordinates system and launched field coordinate system with
And the coordinate transformation relation between launched field coordinate system and image coordinate system, the positional information of true light chopper is transformed into image and sat
Virtual light chopper, then the last frame figure that will be obtained by image composing unit U103 in virtual light chopper and spot film photograph are formed in mark system
As being synthesized, the result after synthesis is shown in control mode, last control unit U104 is according to the operation information to control
It is determined that the target location of true light chopper movement, controls true light chopper to be moved to target location to realize to medical X-ray system
Launched field control.Present apparatus embodiment can equally obtain with the same or similar technique effect of above method embodiment, to keep away
Exempt to repeat, here no longer superfluous words.
Several coordinate systems such as the physical coordinates system, launched field coordinate system, the image coordinate system that are related in present apparatus embodiment
Feature and coordinate transformation relation each other are identical with preceding method embodiment, and corresponding functional unit can be in these coordinates
Respective function is realized under system.In addition, the internal structure of each functional unit of said apparatus embodiment realizes function with it
Mode is relevant, that is to say, that the different implementations of some functional unit function correspond to its different inside composition structure.Than
Such as, image composing unit U103 can be designed using figure layer thought, then, image composing unit U103 may further include
First, which draws subelement U1031, the second drafting subelement U1032 and the 3rd, draws subelement U1033, wherein：
First draws subelement U1031, for the end-frame image obtained in spot film photograph to be plotted in into the first figure layer；
Second draws subelement U1032, for copying the first figure layer to second figure layer, then virtual light chopper is drawn
Onto second figure layer；
Subelement U1033 is shown, for the second figure layer to be plotted into interface figure layer.
Although it should be noted that be referred to some units of the launched field control device of medical X-ray system in described above,
It is that this division is not enforceable.In fact, according to the embodiment of the present invention, two or more above-described units
Feature and function can embody in one apparatus, can also be embodied in different devices.Also, on the contrary, above
The feature and function of one unit of description can be further divided into being embodied by multiple subelements.The device of the application is real
Apply example to can apply in doctor's digital fluorography camera chain, for example digital X-ray gastrointestinal diagnostic system, x-ray Multifunctional permeable
Depending on camera chain etc..
In addition, although the operation of the inventive method is described with particular order in the accompanying drawings, this do not require that or
Hint must be performed according to the particular order these operation, or the operation having to carry out shown in whole could realize it is desired
As a result.Additionally or alternatively, it is convenient to omit some steps, multiple steps are merged into a step execution, and/or by one
Step is decomposed into execution of multiple steps.
Although describing spirit and principles of the present invention by reference to some embodiments, it should be appreciated that, this
Invention is not limited to disclosed embodiment, and the division to each side does not mean that the feature in these aspects can not yet
Combination is this to divide merely to the convenience of statement to be benefited.It is contemplated that cover appended claims spirit and
In the range of included various modifications and equivalent arrangements.
Claims (8)
1. a kind of launched field control method of medical X-ray system, it is characterised in that methods described includes：
Obtain positional information of the true light chopper in beam-defining clipper in physical coordinates system；
Closed according to the Coordinate Conversion between physical coordinates system and launched field coordinate system and between launched field coordinate system and image coordinate system
System, the positional information of true light chopper is transformed into image coordinate system and forms virtual light chopper, where the launched field coordinate system
Plane be x-ray receiver where plane；The physical coordinates system is with the plane where true light chopper and x-ray focus
The intersection point of extended line is the coordinate system of origin, and the launched field coordinate system is prolonging with the plane where x-ray receiver and x-ray focus
The intersection point of long line is the coordinate system of origin, and the origin of described image coordinate system is in the plane where the launched field coordinate system；
Virtual light chopper and the end-frame image that is obtained in spot film photograph are synthesized, the result after synthesis is shown in control mode
Show；
The target location that true light chopper is moved is determined according to the operation information to control, controls true light chopper to be moved to target
Position is to realize to the control of the launched field of medical X-ray system；
Wherein, the result by after synthesis with control mode show including：
Result after synthesis is transformed into by control coordinate according to the coordinate transformation relation between image coordinate system and control coordinate system
Shown in system in control mode, plane where the control coordinate system is the plane where the screen of display control.
2. according to the method described in claim 1, it is characterised in that the plane where the physical coordinates system is sat with the launched field
Plane where marking system is parallel to each other, and the subpoint of the origin of the physical coordinates system in launched field coordinate system is launched field coordinate system
Origin, plane where the launched field coordinate system is approximately the same plane with the plane where described image coordinate system, then：
Postulated point (x0, y0) is the point that physical coordinates are fastened, and point (x0 ', y0 ') is point (x0, y0) on launched field coordinate system
Subpoint, then the coordinate transformation relation between physical coordinates system and launched field coordinate system be：
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</mfenced>
Wherein：Scale is the conversion coefficient that physical coordinates are tied to launched field coordinate system, and Scale value is equal to x-ray focus and sat to launched field
The ratio of distances constant of the distance of mark system plane and x-ray focus to physical coordinates system plane；
Postulated point (x0 ', y0 ') is a point on launched field coordinate system, and point (x1, y1) is point (x0 ', y0 ') in image coordinate system
On corresponding points, then the coordinate transformation relation between launched field coordinate system and image coordinate system be：
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<mi>y</mi>
<mn>1</mn>
<mo>=</mo>
<mi>b</mi>
<mo>-</mo>
<mi>y</mi>
<msup>
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<mo>,</mo>
</msup>
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<mi>h</mi>
<mi>t</mi>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
Wherein：Point (a, b) fastens corresponding pixel coordinate point for the origin of coordinates of launched field coordinate system in image coordinate,
PixelWidth and PixelHeight is respectively the wide and height of image pixel dimensions.
3. method according to claim 2, it is characterised in that the true light chopper in the beam-defining clipper includes two levels
Light chopper and two vertical light choppers, the open area that the horizontal light chopper is surrounded with vertical light chopper, then：
PixelWidth=xWidth1/2a
PixelHeight=yWidth1/2b
Wherein：XWidth1 is the maximum open width between two horizontal light choppers on launched field coordinate system, and yWidth1 is two
Between individual vertical light chopper on launched field coordinate maximum open width.
4. method according to claim 3, it is characterised in that the operation information to control includes hiding dummy level
The moving left and right of line device, moving up and down and to dummy level light chopper and imaginary vertical light chopper to imaginary vertical light chopper
The open area surrounded zooms in and out movement.
5. the method according to any one of Claims 1-4, it is characterised in that described by virtual light chopper and spot film
The image obtained in photography carries out synthesis and specifically included：
The end-frame image obtained in spot film photograph is plotted in the first figure layer；
First figure layer is copied in the second figure layer, then virtual light chopper is plotted in second figure layer；
Second figure layer is plotted in the figure layer of interface.
6. a kind of launched field control device of medical X-ray system, it is characterised in that described device includes：Information acquisition unit, coordinate
Converting unit, image composing unit and control unit, wherein：
Described information acquiring unit, for obtaining positional information of the true light chopper in physical coordinates system in beam-defining clipper；
The coordinate transformation unit, for according between physical coordinates system and launched field coordinate system and launched field coordinate system and image are sat
Coordinate transformation relation between mark system, the positional information of true light chopper is transformed into image coordinate system and forms virtual shade line
Device, the plane where the launched field coordinate system is the plane where x-ray receiver；The physical coordinates system is with true light chopper
The intersection point of the plane at place and the extended line of x-ray focus is the coordinate system of origin, and the launched field coordinate system is x-ray receiver place
Plane and x-ray focus extended line intersection point be origin coordinate system, the origin of described image coordinate system is located at the launched field
In plane where coordinate system；
Described image synthesis unit, for virtual light chopper and the end-frame image that is obtained in spot film photograph to be synthesized, according to
Result after synthesis is transformed into control coordinate system to control by the coordinate transformation relation between image coordinate system and control coordinate system
Part mode shows that plane where the control coordinate system is the plane where the screen of display control；
Described control unit, the target location for determining true light chopper movement according to the operation information to control, control is true
Real light chopper is moved to target location to realize the launched field control to medical X-ray system.
7. device according to claim 6, it is characterised in that the plane where the physical coordinates system is sat with the launched field
Plane where marking system is parallel to each other, and the subpoint of the origin of the physical coordinates system in launched field coordinate system is launched field coordinate system
Origin, plane where the launched field coordinate system is approximately the same plane with the plane where described image coordinate system, then：Assuming that
Point (x0, y0) is the point that physical coordinates are fastened, and point (x0 ', y0 ') is subpoint of the point (x0, y0) on launched field coordinate system,
Then the coordinate transformation relation between physical coordinates system and launched field coordinate system is：
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Wherein：Scale is the conversion coefficient that physical coordinates are tied to launched field coordinate system, and Scale value is equal to x-ray focus and sat to launched field
The ratio of distances constant of the distance of mark system plane and x-ray focus to physical coordinates system plane；
Postulated point (x0 ', y0 ') is a point on launched field coordinate system, and point (x1, y1) is point (x0 ', y0 ') in image coordinate system
On corresponding points, then the coordinate transformation relation between launched field coordinate system and image coordinate system be：
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</mfenced>
Wherein：Point (a, b) fastens corresponding pixel coordinate point for the origin of coordinates of launched field coordinate system in image coordinate,
PixelWidth and PixelHeight is respectively the wide and height of image pixel dimensions.
8. the device according to any one of claim 6 to 7, it is characterised in that described image synthesis unit includes the
One draws subelement, the second drafting subelement and the 3rd drafting subelement, wherein：
Described first draws subelement, for the end-frame image obtained in spot film photograph to be plotted in into the first figure layer；
Described second draws subelement, for copying the first figure layer to second figure layer, then virtual light chopper is plotted into this
In second figure layer；
The display subelement, for the second figure layer to be plotted into interface figure layer.
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| CN105470081B (en) * | 2015-11-23 | 2017-10-17 | 沈阳东软医疗系统有限公司 | Control method, device and the equipment of beam-defining clipper |
| CN108303047A (en) * | 2018-01-02 | 2018-07-20 | 沈阳东软医疗系统有限公司 | A kind of source image away from detection method and device |
| CN111134708B (en) * | 2020-01-06 | 2023-11-14 | 京东方科技集团股份有限公司 | Beam limiter control device and method and radiation imaging equipment |
| CN111443378A (en) * | 2020-05-08 | 2020-07-24 | 江苏康众数字医疗科技股份有限公司 | Intelligent beam splitter and control method |
| CN115024740B (en) * | 2022-08-11 | 2022-10-25 | 晓智未来(成都)科技有限公司 | Virtual radiation field display method for common X-ray photography |
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| CN100381101C (en) * | 2004-04-06 | 2008-04-16 | 东软飞利浦医疗设备系统有限责任公司 | Method for determining effective section width of CT unit |
| CN100569185C (en) * | 2007-12-26 | 2009-12-16 | 东软飞利浦医疗设备系统有限责任公司 | Synchronously simulating shows the method for X-ray bundle irradiation area image change |
| CN102525491B (en) * | 2010-12-15 | 2015-12-02 | 深圳迈瑞生物医疗电子股份有限公司 | X-ray arm holder for radiographic imaging apparatus and beam-defining clipper light wild control method, device |
| CN102961154B (en) * | 2011-08-31 | 2016-07-06 | Ge医疗系统环球技术有限公司 | Regulate the method for exposure field of x-ray system and device and x-ray system |
| CN104043203B (en) * | 2014-06-12 | 2016-11-09 | 合肥工业大学 | The method setting up irradiation source model based on clinac irradiation beam feature |
| CN105470081B (en) * | 2015-11-23 | 2017-10-17 | 沈阳东软医疗系统有限公司 | Control method, device and the equipment of beam-defining clipper |
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Address after: 110179 No. 177-1 Innovation Road, Hunnan District, Shenyang City, Liaoning Province Patentee after: DongSoft Medical System Co., Ltd. Address before: Hunnan New Century Road 110179 Shenyang city of Liaoning Province, No. 16 Patentee before: Dongruan Medical Systems Co., Ltd., Shenyang |