CN104605872A - Radiation field control method and device for medical X-ray system - Google Patents
Radiation field control method and device for medical X-ray system Download PDFInfo
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- CN104605872A CN104605872A CN201410851522.2A CN201410851522A CN104605872A CN 104605872 A CN104605872 A CN 104605872A CN 201410851522 A CN201410851522 A CN 201410851522A CN 104605872 A CN104605872 A CN 104605872A
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Abstract
The invention provides a radiation field control method and device for a medical X-ray system. The method comprises the steps that information of a position, in a physics coordinate system, of a real ray shading device in a beam limiting device is obtained; according to the coordinate conversion relation between the physics coordinate system and a radiation field coordinate system and the coordinate conversion relation between the radiation field coordinate system and an image coordinate system, the information of the position of the real ray shading device is converted into the image coordinate system to form a virtual ray shading device, and the plane where the radiation field coordinate system is located is the plane where an X-ray receiver is located; the virtual ray shading device and an end-frame image obtained from spot film photography are combined, and a combined result is displayed in a control mode; according to operation information of a control, the target position of the real ray shading device is determined, and the real ray shading device is controlled to move to the target position to achieve radiation field control over the medical X-ray system. According to the implementation mode, an interest area can be located accurately.
Description
Technical field
Embodiments of the present invention relate to medical X-ray technical field, particularly relate to a kind of launched field control method and device thereof of medical X-ray system.
Background technology
X-ray (or claiming " x-ray ") is utilized to carry out inspection, the treatment medically extensive use of disease.But it is generally acknowledged, the excessive x-ray that accepts may bring infringement to human body, therefore, carry out in the process of coherence check, treatment in use medical X-ray system, the irradiation of x-ray bundle to patient or associated medical person should be reduced as far as possible.For this reason, medical X-ray system (such as, medical digital X-ray examination camera chain) be called that " launched field " of the device of beam-defining clipper (Collimator) to x-ray bundle controls usually through use one, thus only irradiate the interested region (ROI of doctor, Region OfInterest), avoid patient unnecessary by line.Beam-defining clipper device generally includes multiple light chopper, controls to be regulated by the size of the window formed this multiple light chopper just to realize to " launched field ".
In the prior art, a kind of method that adjustment beam-defining clipper (light chopper) controls " launched field " is that doctor regulates in conjunction with the situation of " launched field display lamp " on beam-defining clipper at close-table place (x-ray system place).But, because x-ray system is positioned at radiation chamber, adopt and necessarily require doctor to enter radiation chamber in this way to carry out close-table operation, and then get back to workbench, utilize x-ray system to carry out diagnosis and treatment to doctor on the one hand to make troubles, doctor may be made to touch x-ray bundle on the other hand, cause unnecessary harm.For overcoming these defects, occur that again a kind of doctor adjusts the way of beam-defining clipper at a distance in control room, doctor need not be operated by close-table.But this distant control beam-defining clipper, usually can not observe the launched field situation of change that beam-defining clipper regulates front and back well, cause the location of region-of-interest inaccurate, cause the possibility of again carrying out x-ray bundle perspective.
In addition, in existing X-ray examination, need to carry out " spot film photograph ", and the usual way of " spot film photograph " is doctor first selects the area-of-interest needing exposure photography, then under maintenance X-ray examination unwrapping wire state, adjustment beam-defining clipper, to observe the location status of light chopper and ROI, finally just carries out exposure image collection.In adjustment beam-defining clipper process, this way makes patient be in by " line " state always, causes patient to receive unnecessary radiation.Meanwhile, which also reduces the service life of work efficiency and equipment.
Summary of the invention
In order to solve the problem, the application's embodiment provides a kind of launched field control method and device thereof of medical X-ray system, to improve the positional accuracy to region-of-interest, reduces the probability of unnecessary x-ray bundle perspective.
The launched field control method of the medical X-ray system that the application's embodiment provides comprises:
Obtain the positional information of true light chopper in physical coordinates system in beam-defining clipper;
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, be transformed in image coordinate system by the positional information of true light chopper and form virtual light chopper, the plane at described launched field coordinate system place is the plane at x-ray receptor place;
The end-frame image obtained in virtual light chopper and spot film photograph is synthesized, the result after synthesis is shown in control mode;
According to the target location operation information of control being determined to true light chopper movement, control true light chopper and move to target location to realize controlling the launched field of medical X-ray system.
Preferably, the coordinate system that described physical coordinates is is initial point with the intersection point of the extended line of the plane at true light chopper place and x-ray focus, described launched field coordinate is the intersection point of the plane at x-ray receptor place and the extended line of x-ray focus is the coordinate system of initial point, and the initial point of described image coordinate system is positioned in the plane at described launched field coordinate system place.
Preferably, the plane at described physical coordinates system place and the plane at described launched field coordinate system place are parallel to each other, the subpoint of initial point in launched field coordinate system of described physical coordinates system is the initial point of launched field coordinate system, the plane at described launched field coordinate system place and the plane at described image coordinate system place are same plane, then:
The point that postulated point (x0, y0) is fastened for physical coordinates, point (x0 ', y0 ') is point (x0, y0) subpoint in launched field coordinate system, then the coordinate transformation relation between physical coordinates system and launched field coordinate system is:
Wherein: Scale is the conversion coefficient that physical coordinates is tied to launched field coordinate system, the value of Scale equals x-ray focus to the distance of launched field coordinate plane and x-ray focus to the ratio of distances constant of physical coordinates system plane;
Postulated point (x0 ', y0 ') is the point of in launched field coordinate system, point (x1, y1) be the corresponding point that point (x0 ', y0 ') is fastened in image coordinate, then the coordinate transformation relation between launched field coordinate system and image coordinate system is:
Wherein: the zero that point (a, b) is launched field coordinate system fastens corresponding pixel coordinate point in image coordinate, and PixelWidth and PixelHeight is respectively the wide and high of image pixel dimensions.
Preferably, the true light chopper in described beam-defining clipper comprises two horizontal light chopper light choppers vertical with two, the open area that described horizontal light chopper surrounds with vertical light chopper, then:
PixelWidth＝xWidth1/2a
PixelHeight＝yWidth1/2b
Wherein: xWidth1 is the maximum open width between two horizontal light choppers in launched field coordinate system, yWidth1 be between two vertical light choppers on launched field coordinate maximum open width.
Preferably, the described operation information to control comprises the moving left and right of dummy level light chopper, moving up and down and carrying out convergent-divergent to the open area that dummy level light chopper and imaginary vertical light chopper surround and move imaginary vertical light chopper.
Preferably, described the image obtained in virtual light chopper and spot film photograph is carried out synthesizing specifically comprising:
The end-frame image obtained in spot film photograph is plotted in the first layer;
First layer is copied in the second layer, more virtual light chopper is plotted in this second layer;
Second layer is plotted in the layer of interface.
Preferably, described result after synthesis display in control mode comprises:
Shown in control mode in control coordinate system by results conversion after synthesizing according to the coordinate transformation relation between image coordinate system and control coordinate system, described control coordinate system place plane is the plane at control place.
The application embodiment further provides a kind of launched field control device of medical X-ray system.This device comprises: information acquisition unit, coordinate transformation unit, image composing unit and control unit, wherein:
Described information acquisition unit, for obtaining the positional information of true light chopper in physical coordinates system in beam-defining clipper;
Described coordinate transformation unit, for 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, be transformed in image coordinate system by the positional information of true light chopper and form virtual light chopper, the plane at described launched field coordinate system place is the plane at x-ray receptor place;
Described image composing unit, for being synthesized by the end-frame image obtained in virtual light chopper and spot film photograph, shows the result after synthesis in control mode;
Described control unit, for according to the target location operation information of control being determined to true light chopper movement, controls true light chopper and moves to target location to realize controlling the launched field of medical X-ray system.
Preferably, the coordinate system that described physical coordinates is is initial point with the intersection point of the extended line of the plane at true light chopper place and x-ray focus, described launched field coordinate is the intersection point of the plane at x-ray receptor place and the extended line of x-ray focus is the coordinate system of initial point, and the initial point of described image coordinate system is positioned in the plane at described launched field coordinate system place.
Preferably, the plane at described physical coordinates system place and the plane at described launched field coordinate system place are parallel to each other, the subpoint of initial point in launched field coordinate system of described physical coordinates system is the initial point of launched field coordinate system, the plane at described launched field coordinate system place and the plane at described image coordinate system place are same plane, then: the point that postulated point (x0, y0) is fastened for physical coordinates, point (x0 ', y0 ') is point (x0, y0) subpoint in launched field coordinate system, then the coordinate transformation relation between physical coordinates system and launched field coordinate system is:
Wherein: Scale is the conversion coefficient that physical coordinates is tied to launched field coordinate system, the value of Scale equals x-ray focus to the distance of launched field coordinate plane and x-ray focus to the ratio of distances constant of physical coordinates system plane;
Postulated point (x0 ', y0 ') is the point of in launched field coordinate system, point (x1, y1) be the corresponding point that point (x0 ', y0 ') is fastened in image coordinate, then the coordinate transformation relation between launched field coordinate system and image coordinate system is:
Wherein: the zero that point (a, b) is launched field coordinate system fastens corresponding pixel coordinate point in image coordinate, and PixelWidth and PixelHeight is respectively the wide and high of image pixel dimensions.
Preferably, described image composing unit comprises the first drafting subelement, second and draws subelement and the 3rd drafting subelement, wherein:
Described first draws subelement, for the end-frame image obtained in spot film photograph is plotted in the first layer;
Described second draws subelement, for copying the first layer to second layer, then is plotted to by virtual light chopper in this second layer;
Described display subelement, for being plotted to interface layer by the second layer.
The application's embodiment first obtains the positional information of true light chopper, the coordinate transformation relation between various coordinate system is utilized to be transformed into by this positional information in image coordinate system to form virtual light chopper, the end-frame image obtained in virtual light chopper and spot film photograph is synthesized virtual image, then show in control mode, and then by realizing the adjustment to true light chopper to the operation of control, reach the control to coverage field.Compared with prior art, the application's embodiment is by being converted to visual virtual light chopper by true light chopper, and by reaching the adjustment to true light chopper to the adjustment of visual virtual light chopper, the control that this mode can make doctor only can realize true light chopper in control room, and clearly can observe control procedure, thus coverage field can be controlled exactly, and then the accurate location to region-of-interest, reduce unnecessary x-ray bundle perspective.In addition, the application's embodiment can not need patient is in by " line " state always in control launched field process, thus avoids patient and suffer unnecessary x-ray radiation.
Accompanying drawing explanation
By reference to accompanying drawing reading detailed description hereafter, above-mentioned and other objects of exemplary embodiment of the invention, feature and advantage will become easy to understand.In the accompanying drawings, show some embodiments of the present invention by way of example, and not by way of limitation, wherein:
Fig. 1 is an embodiment flow chart of the launched field control method of medical X-ray system;
Fig. 2 is the light chopper schematic diagram arranged in a kind of beam-defining clipper;
Fig. 3 is the schematic diagram of relation between several coordinate systems of relating to of the application;
Fig. 4 a is another embodiment flow chart of the launched field control method of medical X-ray system;
Fig. 4 b is the positional information schematic diagram of the light chopper that Fig. 4 a illustrated embodiment relates to;
Fig. 5 is control graphic layer structure schematic diagram;
Fig. 6 a ~ 6c is the schematic diagram using mouse to operate control;
Fig. 7 a ~ 7c is the schematic diagram using touch screen to operate control;
Fig. 8 is the schematic diagram using pointer to operate control;
Fig. 9 a ~ 9d is the schematic diagram before and after light chopper adjustment;
Figure 10 is the structured flowchart of an embodiment of the launched field control device of medical X-ray system.
Detailed description of the invention
Below with reference to some illustrative embodiments, principle of the present invention and spirit are described.Should be appreciated that providing these embodiments is only used to enable those skilled in the art understand better and then realize the present invention, and not limit the scope of the invention by any way.On the contrary, provide these embodiments to be to make the disclosure more thorough and complete, and the scope of the present disclosure intactly can be conveyed to those skilled in the art.
See Fig. 1, the figure shows the flow chart of the launched field control method embodiment (the first embodiment) of a kind of medical X-ray system of the application, the flow process of this embodiment comprises:
Step S11: obtain the positional information of true light chopper in physical coordinates system in beam-defining clipper;
As previously mentioned, light chopper is the adjusting part that beam-defining clipper realizes controlling launched field, and under normal circumstances, light chopper can show as template elongate in shape, by this template elongate in shape being carried out moving the scope changing launched field.See Fig. 2, the figure shows the light chopper facilities in a kind of limiter of speed, four light choppers shown in this figure, comprise two vertical light chopper I (laying respectively at the upper side and lower side) and two horizontal light chopper II (laying respectively at left side and right side), the inside edge of these four light choppers (namely the right of the lower edge of light chopper, upside, the upper edge of downside light chopper and left side light chopper is along the left margin of, right side light chopper) surrounds an open area, and the size controlling this open area can realize the control to coverage field.In so a kind of light chopper set-up mode, can with the central point of above-mentioned open area for zero, the plane at light chopper place is coordinate plane, builds a physical coordinates system, and namely each light chopper coordinate position is in the coordinate system the positional information of light chopper.
Here also need some is described: one is the quantity about light chopper.Signal shown in Fig. 2 there is shown four light choppers, so can obtain the positional information of these four light choppers in physical coordinates system respectively, then these information are utilized to carry out subsequent treatment, but, this does not also mean that and must arrange four light choppers in this application and the positional information that simultaneously must obtain four light choppers, in fact, in order to reach the object controlled field size, at least one light chopper can be set, and realized by the position changing at least one light chopper, under this situation, the application only can use a light chopper and obtain the positional information of this light chopper in physical coordinates system.Same reason, the physical location obtaining the light chopper of two or other quantity all can realize the goal of the invention of the application.Two about light chopper " true and false ".Light chopper is limited with " truly " in above-mentioned steps, this linguistic conversion mainly for the ease of distinguishing mutually and do with follow-up " virtual " light chopper, typically, " true light chopper " refers to the light chopper existed in real world (or being called physical world), " virtual light chopper " refers to the light chopper of the Image Creation presented in digitized information equipment (such as, computer).Three is about physical coordinates system.In the application's embodiment, arrange " physical coordinates system " is the positional information being convenient to determine true light chopper, as long as in fact there is the existence of coordinate system, just the position of light chopper can be weighed to quantification, that is, the application puts with which physical coordinates system itself is initial point, which direction is X-axis, Y-axis does not need to do special restriction.Certainly, in the above-mentioned open area surrounded by four light choppers mentioned, with the central point of open area be zero, with the plane at light chopper place for coordinate plane is a kind of suitable selection, this setting means to physical coordinates system and follow-up other coordinate systems that will mention suitably are arranged in pairs or groups, then can play the effect of simplified operation.
Step S12: 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, be transformed in image coordinate system by the positional information of true light chopper and form virtual light chopper, the plane at described launched field coordinate system place is the plane at x-ray receptor place;
Step S13: synthesized by the end-frame image obtained in virtual light chopper and spot film photograph, shows the result after synthesis in control mode;
Step S14: according to the target location operation information of control being determined to true light chopper movement, controls true light chopper and moves to target location to realize controlling the launched field of medical X-ray system;
After showing virtual light chopper in control mode, doctor can be with reference to carrying out various operation to control on a display panel with end-frame image, such as, virtual light chopper in control is carried out left and right or moved up and down, or when surrounding open area by multiple light chopper, the overall convergent-divergent carrying out coverage field moves.The position of virtual light chopper movement can be determined according to these operation informations, and then can determine that true light chopper needs the target location moved to, then the true light chopper of device drives controlling to be correlated with moves to target location, thus final just achieving controls the launched field of medical X-ray system.After adjusting suitable coverage field, can expose in coverage field, to collect the image of needs.
First obtain the positional information of true light chopper in the above-described embodiment, the coordinate transformation relation between various coordinate system is utilized to be transformed into by this positional information in image coordinate system to form virtual light chopper, show in control mode after the end-frame image obtained in virtual light chopper and spot film photograph is synthesized, and then by realizing the adjustment to light chopper to the operation of control, reach the control to launched field.Compared with prior art, the application's embodiment at least can obtain following technique effect:
(1) by the above-mentioned embodiment of the application, true light chopper is converted to visual virtual light chopper, by can reach the adjustment to true light chopper to the adjustment of visual virtual light chopper, thus make doctor can control that only virtual light chopper just can realize coverage field on control room operation display panel, and without the need to operating on the spot to close-table place, for doctor provides conveniently, it also avoid doctor and too much touch x-ray.
(2) owing to can be presented in face of doctor intuitively through virtualized light chopper, doctor can observe the change of coverage field in real time in operational controls is with the process adjusting light chopper in real time, thus more adequately can realize location to region-of-interest, reduce and unnecessary x-ray bundle perspective is carried out to patient.
(3) end-frame image obtained in virtual light chopper and spot film photograph synthesizes by the above-mentioned embodiment of the application, doctor can with " last frame " image for reference accurately locates area-of-interest, in this course, can stop to irradiation object (such as, patient) carry out the irradiation of x-ray, and after adjusting coverage field, carry out Correct exposure again, thus in launched field control procedure, make patient no longer be in by " line " state, and then avoid patient and suffer unnecessary x-ray radiation.
Physical coordinates system is mentioned in the step S12 of above-mentioned embodiment (the first embodiment), several coordinate systems such as launched field coordinate system and image coordinate system, relation between these coordinate systems can be presented as various concrete form, such as, the coordinate system that physical coordinates system to be defined as with the intersection point of the extended line of the plane at true light chopper place and x-ray focus be initial point, launched field coordinate is the intersection point of the plane at x-ray receptor place and the extended line of x-ray focus is the coordinate system of initial point, the initial point of described image coordinate system is positioned in the plane at described launched field coordinate system place.The complexity that different passes ties up to when carrying out Coordinate Conversion may there are differences, but, no matter which kind of concrete form is only that the coordinate transform process that carries out between coordinate system is different, does not hinder and is tied to correct conversion (mapping) between another coordinate system by a kind of coordinate.In actual application, the application preferably can adopt the coordinate system system shown in Fig. 3.In the figure, uppermost point is x-ray focus, x-ray bundle penetrates from here, be physical coordinates system at this spot projection to the coordinate at first plane (the from top to bottom observe) place of (or being mapped to from the x-ray of x-ray focus injection), square frame in coordinate system represents the coverage field that multiple (in figure being 4) light chopper surrounds, the zero of this coordinate system is the intersection point of x-ray bundle and light chopper place plane, and the unit of coordinate system can adopt millimeter (mm) magnitude in the coordinate system.X-ray focus projection to second plane be launched field coordinate system, the plane at launched field coordinate system place is generally the plane at x-ray receptor place, and in launched field coordinate system, coordinate system unit also can adopt millimeter (mm) magnitude.3rd coordinate system is image coordinate system, and the plane at this image coordinate system place is identical plane with the plane at launched field coordinate system place in figure 3.Certain angle can be had between the plane at these coordinate system places, also parallel relation (as shown in Figure 3) can be shown as, when being presented as certain angle, corresponding transformational relation can be taked to be transformed among another coordinate system by the point in a coordinate system.Several plane sets is parallel relation by the convenience below in order to discuss.On this basis, the coordinate transformation relation between physical coordinates system and launched field coordinate system, between launched field coordinate system and image coordinate system can specifically be drawn.
Here a point fastening for physical coordinates of postulated point (x0, y0), point (x0 ', y0 ') is point (x0, y0) subpoint in launched field coordinate system, then the coordinate transformation relation between physical coordinates system and launched field coordinate system is:
Wherein: Scale is the conversion coefficient between physical coordinates system and launched field coordinate system, its value equals x-ray focus to distance (SID as shown in Figure 3) and the x-ray focus of launched field coordinate system place plane to the ratio of the distance (D1 as shown in Figure 3) of physical coordinates system place plane.
The subpoint that postulated point (x1, y1) is fastened in image coordinate for point (x0 ', y0 '), then the coordinate transformation relation between launched field coordinate system and image coordinate system is:
Wherein: the pixel coordinate that the zero that point (a, b) is launched field coordinate system is fastened in image coordinate, PixelWidth and PixelHeight is respectively the wide and high of image pixel dimensions.
On the basis discussing the coordinate transformation relation between several coordinate system in detail, provide can annotate technical scheme one example (the second embodiment) specifically below in conjunction with the light chopper arranged shown in this coordinate transformation relation and Fig. 2.See Fig. 4 a, the figure shows the flow process of this example, this flow process comprises:
Step S41: obtain the positional information of true light chopper in physical coordinates system in beam-defining clipper;
The position coordinates that physical coordinates system according to Fig. 3 can obtain four light choppers is respectively (note: here for convenience of description, only for the edge coordinate of light chopper, see 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 vertical coordinate under upper vertical light chopper: V_uPos0=V_uPhyPos;
Along vertical coordinate on lower vertical light chopper: V_dPos0=– V_dPhyPos.
Step S42: the positional information of true light chopper is transformed in launched field coordinate system according to the coordinate transformation relation between physical coordinates system and launched field coordinate system;
As previously mentioned, the coordinate transformation relation between physical coordinates system and launched field coordinate system can be presented as following formula:
The positional information of 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 vertical coordinate under upper vertical light chopper: V_uPos0 '=Scale × V_uPos0;
Along vertical coordinate on lower vertical light chopper: V_dPos0 '=Scale × V_dPos0.
Step S43: according to the coordinate transformation relation between launched field coordinate system and image coordinate system the positional information of true light chopper under launched field coordinate system be transformed in image coordinate system and form virtual light chopper;
As previously mentioned, the coordinate transformation relation between launched field coordinate system and image coordinate system can be presented as following formula:
The positional information of 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 vertical coordinate under upper vertical light chopper:
V_uPos1＝b–Scale×V_uPos0/PixelHeight；
Along vertical coordinate on lower vertical light chopper:
V_dPos1＝b–Scale×V_dPos0/PixelHeight。
Step S44: synthesized by the end-frame image obtained in virtual light chopper and spot film photograph, shows the result after synthesis in control mode;
Here directly control can be presented in image coordinate system, but in actual application, to consider that image coordinate system may exist with the device screen finally showing control in ratio inharmonious, in view of the situation, a control coordinate system can be set again.Shown in Figure 3, undermost coordinate is control coordinate system, in figure 3, the plane at control coordinate system place be the virtual light chopper of final display and end-frame image synthesize after the display plane of synthesis result, the initial point of this coordinate system with the upper left corner of virtual light chopper open area for initial point, under this situation, postulated point (x2, y2) in control coordinate system with the point (x1 in image coordinate system,, then there is following Coordinate Conversion between image coordinate system and control coordinate system and transfer from one department to another in y1) corresponding point:
In formula: Scale ' is display image zooming rate, represents the conversion coefficient of image coordinate system and control coordinate system.The virtual coverage field formed at virtual light chopper is of a size of 2A × 2B, and (unit can be mm
2) when, because the wide high proportion of picture size and control virtual coverage field size is identical, therefore, the value of Scale ' can be determined in the following manner:
Scale '=A/a, or
Scale’＝B/b
The positional information of virtual light chopper in control coordinate system can be obtained according to the transformational relation between above-mentioned image coordinate system and control 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 vertical coordinate under upper vertical light chopper:
V_uPos2＝Scale’×(b–Scale×V_uPos0/PixelHeight)；
Along vertical coordinate on lower vertical light chopper:
V_dPos2＝Scale’×(b–Scale×V_dPos0/PixelHeight)。
Step S45: according to the target location operation information of control being determined to true light chopper movement, controls true light chopper and moves to target location to realize controlling the launched field of medical X-ray system.
Mention in the step 13 of above-mentioned embodiment (the first embodiment) and need to synthesize image.Synthesis can be taked various ways to realize, and displaying contents is more clear, display efficiency is higher in order to make for the application, adopts layer thought to carry out design and synthesis procedure for displaying.See Fig. 5, the figure shows graphic layer structure, comprise four layer in the figure, nethermost layer (referred to herein as " lower layer ") is Background From Layer (Background Overlay), for display background color (being black in this figure); First layer (that layer namely on " lower layer ") is image layer (Image Overlay), for showing image, such as, and the end-frame image in spot film photograph, final exposure image etc.; Second layer (that layer namely above the first layer) is light chopper layer (Shutter Overlay), for showing the positional information of light chopper, be translucent area at the zone line of layer, to observe the image below it in layer; Uppermost layer (referred to herein as " upper layer ") is information layer (Information Overlay), for showing reference line or other temporary informations.In these layer, upper and lower layer is mainly the effect of two layer in the middle of reinforcement and sets, and in some cases, can not use this two layer.Thus, utilize the first layer, building-up process that the second layer realizes the end-frame image obtained in virtual light chopper and spot film photograph can be such: first the end-frame image obtained in spot film photograph is plotted in the first layer, then the first layer is copied in the second layer, again virtual light chopper is plotted in this second layer, finally the second layer is plotted in the layer of interface.Certainly, if need to draw " upper layer ", then reason is similar, copies in " upper layer ", then draw reference line and some other temporary informations of selected zone by the second layer.By using the design philosophy of this layer, when certain layer changing above, only needing to redraw that layer of changing and the layer above it, thus improve display efficiency.
Mention in the step 14 of above-mentioned embodiment (the first embodiment) and control is operated, in actual application, multiple operation tool can be adopted to carry out the operation of various ways.Carrying out on the touchscreen of mentioning as aforementioned moves left and right, move up and down or convergent-divergent moves.For the ease of the clearer technical scheme understanding the application, be described to use mouse, touch screen and pointer three kinds of instruments to carry out the various forms of example that is operating as to control respectively below:
One of exemplary approach: use mouse to carry out various forms of operation to control
See Fig. 6, the figure shows to single light chopper (Fig. 6 a), the process (Fig. 6 c) that operates of two adjacent light choppers (Fig. 6 b) and 4 light choppers.Single light chopper is carried out to the situation operated, as shown in Figure 6 a, only mouse need be moved to virtual light chopper edge (see first subgraph), when pointer becomes
(being positioned on vertical light chopper) or
time (being positioned on horizontal light chopper), press left mouse button and drag virtual light chopper (see second subgraph), after unclamping left button, corresponding actual physics light chopper (i.e. true light chopper) just can move to relevant position (see the 3rd subgraph).For simultaneously to the situation that two adjacent light choppers (a vertical light chopper and a horizontal light chopper) operate, as shown in Figure 6 b, when mouse moves to the intersection point at adjacent virtual light chopper edge (see first subgraph), pointer can become
or
now press left mouse button and drag light chopper to assigned address (see second subgraph), after unclamping left button, two corresponding actual physics light choppers just can move to relevant position (see the 3rd subgraph).For simultaneously to the situation that four light choppers (i.e. the translation of beam-defining clipper launched field) operate, as fig. 6 c, when mouse moves in open area (see first subgraph), pointer can become
now press left mouse button and drag launched field to assigned address (see second subgraph), after unclamping left button, actual physics light chopper just can move to relevant position (see the 3rd subgraph).
Exemplary approach two: use touch screen to carry out various forms of operation to control
See Fig. 7, the figure shows to single light chopper (Fig. 7 a), the process (Fig. 7 c) that operates of two adjacent light choppers (Fig. 7 b) and 4 light choppers.Single light chopper is carried out to the situation operated, as shown in Figure 7a, only need touch the edge (see first subgraph) of virtual light chopper, and dragging to assigned address (see second subgraph), corresponding actual physics light chopper just can move to relevant position (see the 3rd subgraph).For the situation operated two adjacent light choppers (a vertical light chopper and a horizontal light chopper), as shown in Figure 7b, only need touch the intersection point at adjacent virtual light chopper edge, and dragging to assigned address (see second subgraph), corresponding actual physics light chopper just can move to relevant position (see the 3rd subgraph).For simultaneously to the situation that four light choppers (i.e. the translation of beam-defining clipper launched field) operate, as shown in Figure 7 c, only open area need be touched, and dragging open area to assigned address (see second subgraph), actual physics light chopper just can move to relevant position (see the 3rd subgraph).
Exemplary approach three: use pointer control to carry out various forms of operation
See Fig. 8, only need, in the coverage field of display control, utilize touch-control stroke to get new launched field rectangular area, corresponding actual physics light chopper just can move to relevant position.
As previously mentioned, by operating the virtual light chopper control on screen, the adjustment to true light chopper position can be realized, thus coverage field is controlled.Suppose that carrying out spot film photograph gets shown in position display Fig. 9 a of last frame (last frame) image and light chopper, then manipulate according to any one mode in aforementioned three kinds of operational controls, just can obtain new light chopper position as shown in figure 9b and new coverage field size.On this basis, again can expose, obtain the final image (as is shown in fig. 9 c) needed, then it is met to the process of various needs, than processing and amplifying as shown in figure 9d.
The various embodiments of the method that the launched field that foregoing describes the medical X-ray system of the application in detail controls, similarly, present invention also provides the embodiment of the launched field control device of medical X-ray system.See Figure 10, the figure shows the composition structured flowchart of an embodiment of the launched field control device of the medical X-ray system of the application.This embodiment comprises: information acquisition unit U101, coordinate transformation unit U102, image composing unit U103 and control unit U104, wherein:
Information acquisition unit U101, for obtaining the positional information of true light chopper in physical coordinates system in beam-defining clipper;
Coordinate transformation unit U102, for 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, be transformed in image coordinate system by the positional information of true light chopper and form virtual light chopper, the plane at described launched field coordinate system place is with the plane of the object contact of x-ray to be illuminated;
Image composing unit U103, for being synthesized by the end-frame image obtained in virtual light chopper and spot film photograph, shows the result after synthesis in control mode;
Control unit U104, for according to the target location operation information of control being determined to true light chopper movement, controls true light chopper and moves to target location to realize controlling the launched field of medical X-ray system.
The work process of said apparatus embodiment is: information acquisition unit U101 obtains the positional information of true light chopper in physical coordinates system in beam-defining clipper, then by coordinate transformation unit U102 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 in image coordinate system and forms virtual light chopper, by image composing unit U103, the end-frame image obtained in virtual light chopper and spot film photograph is synthesized again, result after synthesis is shown in control mode, last control unit U104 is according to the target location operation information of control being determined to true light chopper movement, control true light chopper and move to target location to realize controlling the launched field of medical X-ray system.This device embodiment can obtain technique effect same or similar with said method embodiment equally, for avoiding repetition, and no longer superfluous words here.
The feature of several coordinate systems such as the physical coordinates system related in this device embodiment, launched field coordinate system, image coordinate system and coordinate transformation relation each other identical with preceding method embodiment, corresponding functional unit can realize respective function under these coordinate systems.In addition, the internal structure of each functional unit of said apparatus embodiment is relevant with the mode of its practical function, and that is, the different implementations of certain functional unit function correspond to its different inside composition structure.Such as, image composing unit U103 can adopt layer thought to design, and so, image composing unit U103 may further include the first drafting subelement U1031, second and draws subelement U1032 and the 3rd drafting subelement U1033, wherein:
First draws subelement U1031, for the end-frame image obtained in spot film photograph is plotted in the first layer;
Second draws subelement U1032, for copying the first layer to second layer, then is plotted to by virtual light chopper in this second layer;
Display subelement U1033, for being plotted to interface layer by the second layer.
Although it should be noted that the some unit being referred to the launched field control device of medical X-ray system in describing above, this division is not enforceable.In fact, according to the embodiment of the present invention, the Characteristic and function of two or more unit above-described can be specialized in one apparatus, also can specialize in different devices.Further, on the contrary, an above-described unit Characteristic and function can Further Division for be specialized by multiple subelement.The device embodiment of the application can be applied in doctor's digital fluorography camera chain, such as digital X-ray gastrointestinal diagnostic system, the multi-functional perspective camera chain of x-ray etc.
In addition, although describe the operation of the inventive method in the accompanying drawings with particular order, this is not that requirement or hint must perform these operations according to this particular order, or must perform the result that all shown operation could realize expectation.Additionally or alternatively, some step can be omitted, multiple step be merged into a step and perform, and/or a step is decomposed into multiple step and perform.
Although describe spirit of the present invention and principle with reference to some detailed description of the invention, but should be appreciated that, the present invention is not limited to disclosed detailed description of the invention, can not combine to be benefited to the feature that the division of each side does not mean that in these aspects yet, this division is only the convenience in order to state.The present invention is intended to contain the interior included various amendment of spirit and scope and the equivalent arrangements of claims.
Claims (11)
1. a launched field control method for medical X-ray system, is characterized in that, described method comprises:
Obtain the positional information of true light chopper in physical coordinates system in beam-defining clipper;
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, be transformed in image coordinate system by the positional information of true light chopper and form virtual light chopper, the plane at described launched field coordinate system place is the plane at x-ray receptor place;
The end-frame image obtained in virtual light chopper and spot film photograph is synthesized, the result after synthesis is shown in control mode;
According to the target location operation information of control being determined to true light chopper movement, control true light chopper and move to target location to realize controlling the launched field of medical X-ray system.
2. method according to claim 1, it is characterized in that, the coordinate system that described physical coordinates is is initial point with the intersection point of the extended line of the plane at true light chopper place and x-ray focus, the coordinate system that described launched field coordinate is is initial point with the intersection point of the extended line of the plane at x-ray receptor place and x-ray focus, the initial point of described image coordinate system is positioned in the plane at described launched field coordinate system place.
3. method according to claim 2, it is characterized in that, the plane at described physical coordinates system place and the plane at described launched field coordinate system place are parallel to each other, the subpoint of initial point in launched field coordinate system of described physical coordinates system is the initial point of launched field coordinate system, the plane at described launched field coordinate system place and the plane at described image coordinate system place are same plane, then:
The point that postulated point (x0, y0) is fastened for physical coordinates, point (x0 ', y0 ') is point (x0, y0) subpoint in launched field coordinate system, then the coordinate transformation relation between physical coordinates system and launched field coordinate system is:
Wherein: Scale is the conversion coefficient that physical coordinates is tied to launched field coordinate system, the value of Scale equals x-ray focus to the distance of launched field coordinate plane and x-ray focus to the ratio of distances constant of physical coordinates system plane;
Postulated point (x0 ', y0 ') is the point of in launched field coordinate system, point (x1, y1) be the corresponding point that point (x0 ', y0 ') is fastened in image coordinate, then the coordinate transformation relation between launched field coordinate system and image coordinate system is:
Wherein: the zero that point (a, b) is launched field coordinate system fastens corresponding pixel coordinate point in image coordinate, and PixelWidth and PixelHeight is respectively the wide and high of image pixel dimensions.
4. method according to claim 3, is characterized in that, the true light chopper in described beam-defining clipper comprises two horizontal light chopper light choppers vertical with two, the open area that described horizontal light chopper surrounds with vertical light chopper, then:
PixelWidth＝xWidth1/2a
PixelHeight＝yWidth1/2b
Wherein: xWidth1 is the maximum open width between two horizontal light choppers in launched field coordinate system, yWidth1 be between two vertical light choppers on launched field coordinate maximum open width.
5. method according to claim 4, it is characterized in that, the described operation information to control comprises the moving left and right of dummy level light chopper, moving up and down and carrying out convergent-divergent to the open area that dummy level light chopper and imaginary vertical light chopper surround and move imaginary vertical light chopper.
6. according to the method in claim 1 to 5 described in any one, it is characterized in that, described the image obtained in virtual light chopper and spot film photograph carried out synthesizing specifically comprising:
The end-frame image obtained in spot film photograph is plotted in the first layer;
First layer is copied in the second layer, more virtual light chopper is plotted in this second layer;
Second layer is plotted in the layer of interface.
7. method according to claim 6, is characterized in that, described result after synthesis display in control mode comprises:
Shown in control mode in control coordinate system by results conversion after synthesizing according to the coordinate transformation relation between image coordinate system and control coordinate system, described control coordinate system place plane is the plane at the screen place of display control.
8. a launched field control device for medical X-ray system, is characterized in that, described device comprises: information acquisition unit, coordinate transformation unit, image composing unit and control unit, wherein:
Described information acquisition unit, for obtaining the positional information of true light chopper in physical coordinates system in beam-defining clipper;
Described coordinate transformation unit, for 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, be transformed in image coordinate system by the positional information of true light chopper and form virtual light chopper, the plane at described launched field coordinate system place is the plane at x-ray receptor place;
Described image composing unit, for being synthesized by the end-frame image obtained in virtual light chopper and spot film photograph, shows the result after synthesis in control mode;
Described control unit, for according to the target location operation information of control being determined to true light chopper movement, controls true light chopper and moves to target location to realize controlling the launched field of medical X-ray system.
9. device according to claim 8, it is characterized in that, the coordinate system that described physical coordinates is is initial point with the intersection point of the extended line of the plane at true light chopper place and x-ray focus, described launched field coordinate is the intersection point of the plane at x-ray receptor place and the extended line of x-ray focus is the coordinate system of initial point, and the initial point of described image coordinate system is positioned in the plane at described launched field coordinate system place.
10. device according to claim 9, it is characterized in that, the plane at described physical coordinates system place and the plane at described launched field coordinate system place are parallel to each other, the subpoint of initial point in launched field coordinate system of described physical coordinates system is the initial point of launched field coordinate system, the plane at described launched field coordinate system place and the plane at described image coordinate system place are same plane, then: postulated point (x0, y0) be a point that physical coordinates is fastened, point (x0 ', y0 ') be point (x0, y0) subpoint in launched field coordinate system, coordinate transformation relation then between physical coordinates system and launched field coordinate system is:
Wherein: Scale is the conversion coefficient that physical coordinates is tied to launched field coordinate system, the value of Scale equals x-ray focus to the distance of launched field coordinate plane and x-ray focus to the ratio of distances constant of physical coordinates system plane;
Postulated point (x0 ', y0 ') is the point of in launched field coordinate system, point (x1, y1) be the corresponding point that point (x0 ', y0 ') is fastened in image coordinate, then the coordinate transformation relation between launched field coordinate system and image coordinate system is:
Wherein: the zero that point (a, b) is launched field coordinate system fastens corresponding pixel coordinate point in image coordinate, and PixelWidth and PixelHeight is respectively the wide and high of image pixel dimensions.
Device in 11. according to Claim 8 to 10 described in any one, is characterized in that, described image composing unit comprises the first drafting subelement, second and draws subelement and the 3rd drafting subelement, wherein:
Described first draws subelement, for the end-frame image obtained in spot film photograph is plotted in the first layer;
Described second draws subelement, for copying the first layer to second layer, then is plotted to by virtual light chopper in this second layer;
Described display subelement, for being plotted to interface layer by the second layer.
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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 |