CN205286379U - A rotatable scattering grid that is used for X ray image to shoot equipment - Google Patents
A rotatable scattering grid that is used for X ray image to shoot equipment Download PDFInfo
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- CN205286379U CN205286379U CN201520696546.5U CN201520696546U CN205286379U CN 205286379 U CN205286379 U CN 205286379U CN 201520696546 U CN201520696546 U CN 201520696546U CN 205286379 U CN205286379 U CN 205286379U
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Abstract
The utility model relates to a scattering grid of equipment is shot to the X ray image, be used for arranging before X ray radiation detector in the X -radiation direction, wherein, the scattering grid has the circular base face of radius for r=Rmax, the scattering grid founds the center rotation for centering on the scattering grid, and the scattering grid is including a plurality of radiation passageways that pass through X -radiations in the base face, wherein, the radiation passageway forms through a plurality of grid splicing that center on it completely, wherein, grid splicing is extended along the spiral curve in the base face respectively. The utility model discloses still relate to equipment is shot to the X ray image.
Description
Technical field
This utility model relates to a kind of rotatable scatter-grid with circular basal plane and multiple radiation channel, and includes the radioscopic image capture apparatus of corresponding scatter-grid.
Background technology
Known radioscopic image capture apparatus is typically structured with: the X-radiation of radial symmetric is from point-like x-ray source, usually X-ray tube outgoing. This X-radiation penetrates inspection object, such as patient, and is detected by picture receiver or the x-ray radiation detector of spatial discrimination. In checking object or patient, produce scattering by the relevant and incoherent reciprocal action of incident X-radiation with material. This scattering is detected by detector equally, but is not loaded with image information, thus forms interference signal in produced radioscopic image shoots. Compared to primary X-ray radiation, the scattering formed in checking object sends along all direction in spaces. In x-ray imaging, scattering is formed, so using scatter grid because being little to stop. This scatter grid make use of the random directional spreding of scattering. Scatter grid is arranged between inspection object and detector. It is generally made up of fine blade or contact pin (Steg), this blade or contact pin by absorbing the material of X-radiation particularly well, such as lead is made. Blade is arranged essentially parallel to X-radiation direction and arranges and have specific length in the direction, thus the major part of primary X-ray radiation can pass through grid, because it does not hit blade wall, on the contrary, scattering major part is hit blade wall and absorbed there.
In order to realize stable structure, blade wall typically has the thickness of 80 ��m to 100 ��m. For the pixel size in angiography being such as 150 ��m to 200 ��m, it is therefore clear that the structure of scatter grid can by radioscopic image capture apparatus imaging in radioscopic image shoots. In other words, when grid is too big, it is possible to identify it in radioscopic image shoots periodically. This effect is unfavorable for image impression and picture quality that observer is formed very much.
Avoid a probability of imaging grid in radioscopic image shoots to be in that, scatter grid is moved relative to x-ray radiation detector during image acquisition. This method is such as described in open source literature DE102005052992A1. There, scatter grid experience linear movement, specifically, moving back and forth of the straight line relative to detector implemented by grid. What wiping in the space based on the image information of grid or smear caused is, it is impossible to differentiate each blade of grid in radioscopic image shooting again.But, just work with the hi-vision speed of such as 15 to 30 frames per second in interventional therapy. Correspondingly, the linear movement of grid also must carry out with significantly high speed. Machinery and executor are such as proposed high request by this in the acceleration occurred, because grid must be guided by noiseless and friction. Additionally, the linear movement of grid must be synchronize with X-ray pulse, this also requires that high exploitation expense.
Utility model content
Based on this, task of the present utility model is to provide the scatter-grid of a kind of improvement, which overcomes described shortcoming. This task is solved by scatter-grid and radioscopic image capture apparatus according to this utility model.
This utility model on the one hand based on the rotary motion that the linear movement of scatter-grid shown in being used for suppressing shooting at radioscopic image is changed into scatter-grid, and be simultaneously based on coupling grid contact pin, for the most suitable grille-like of rotary motion of scatter-grid or configuration. By these measures, it is possible to effectively suppress scattering and can realize simply and stoping in radioscopic image shoots scatter-grid imaging in motion reliably at scatter-grid in x-ray imaging.
Correspondingly, this utility model relate to a kind of for radioscopic image capture apparatus, for the scatter-grid before being upwardly arranged at x-ray radiation detector in X-radiation side, wherein, it is r=R that scatter-grid has radiusmaxCircular basal plane, scatter-grid is configured to can around the central rotation of scatter-grid, and scatter-grid includes the radiation channel of multiple transmission X-ray radiation in basal plane, wherein, radiation channel is to be formed by multiple grid contact pin entirely around it, wherein, grid contact pin extends along helical curve respectively in basal plane.
Circular with it according to scatter-grid of the present utility model and thus rotational symmetric basic configuration and be particularly well applicable for rotary motion, because it allows substantially uniform distribution of weight, the rotation axis of scatter-grid also corresponds to its principal axis of inertia line. Correspondingly, scatter-grid is configured to can around its central rotation, and rotation axis and principal axis of inertia line extend through this center. Rotation is particularly well suited for as motion mode, because scatter-grid only also stands acceleration when starting with inertia motion, this can carry out before imaging and afterwards. Rotation is that sound is less less to be carried out with vibration, and can also mechanically realize simply. One minute realizes the speed of 300 to 1500 turns. The side that the driving that this is required advantageously acts on scatter grid acts on its circumference in other words, in order to do not damage x-ray imaging. Drive and such as can be undertaken by electromagnetic field or mechanically undertaken by certain class V band.
Typically, the grid structure of scatter grid is to be formed by parallel and/or extension and alternate constant squarely grid blade, or is configured to honeycomb. Radiation channel then corresponds respectively to the passage of linear, the rectangle between blade, square or honeycomb. Inventor is it is now realized that when abandoning these usual grid structures, it is possible to improve scatter suppression with the scatter-grid rotated. Correspondingly, grid contact pin extends in basal plane according to this utility model on spiral path. Spiral is understood as each following plane curve under meaning of the present utility model, this curve around a point, i.e. focus extend and from it increasingly away from.
Achieve the scatter suppression of improvement according to scatter-grid of the present utility model, this has been significantly expanded picture quality and the ratio of the dosage used. According to an aspect of the present utility model, the limit of the helical curve that the grid contact pin of scatter-grid extends thereon is positioned at the center of its circular basal plane. This simplify the rotational symmetric configuration of scatter-grid, and describe as discussed and also help grid contact pin being uniformly distributed in the basal plane of scatter-grid like that.
According to another aspect of the present utility model, helical curve dextrorotation and left-handed extend. In other words, scatter-grid includes the grid contact pin performing bending clockwise from the center of scatter-grid, and performs the grid contact pin of bending counterclockwise from the center of scatter-grid. Then, the grid contact pin on right hand curve and the grid contact pin on left-hand curve are intersected. Radiation channel is formed accordingly by two adjacent grid contact pin on right hand curve and two adjacent grid contact pin on left-hand curve, and the bending of grid contact pin can have trapezoidal shape with ignoring. The intersection point of grid contact pin significantly improves the stability of scatter-grid, and it is configured to self-supporting according to this aspect.
According to another aspect of the present utility model, helical curve is configured to helix plane, logarithmic. This aspect is based on such consideration, i.e. in the rotary motion of scatter-grid, the grid contact pin that visible and local motion direction tangentially extends in radioscopic image shoots. It is desirable that the grid contact pin only radially extended. Because the structure of self-supporting thus cannot be built, so inventor have selected best trading off between stability and imaging characteristic, i.e. make grid contact pin extend along logarithmic helix. Logarithmic helix can with polar coordinate equation
Describing, wherein, k=constant is as the pitch of helix, and �� is as helical angle, wherein tan (��)=k. The characteristic that logarithmic helix has is, is intersected with helix with identical angle by every of focus straight line. Especially, when the pitch of helix is 1, grid contact pin is always located in the angle of 45 �� relative to radius. In the configuration of an alternative, it is possible to mating the pitch of logarithmic helix and be especially chosen to more than 1, this achieves grid contact pin and strengthens (Aufsteilung) relative to the steepness of its radius. Thus, grid contact pin is closer to radially moving towards. The radial direction trend of grid contact pin full out disappears and thus invisible in rotary motion. Additionally, the radial direction trend of grid contact pin improves the stability of scatter-grid, steeper grid contact pin can absorb revolving force better.
According to another aspect of the present utility model, scatter-grid the center around basal plane, radius be r=RminCircle in there is opening, this opening does not have grid contact pin. In other words, grid contact pin only extends at this open outside. This aspect is based on following consideration, i.e. other at the center of rotation of rotary motion or near, the absolute velocity of scatter-grid is only small. The obvious movement velocity below the image rate of x-ray imaging equipment of grid contact pin will cause not rectifiable image artifacts. Inventor it is now appreciated that, it is possible to get rid of this artifact by not designing grid contact pin in other words in center of rotation designed openings. If the radius R of this openingminIt is little compared to the radius of scatter-grid, for instance in the scope of 10% to 15%, then there will be and can correct the raising of scattering in this range.Additionally, radius RminDepend on the pitch of helix or the angle of attack (Anstellwinkel) of grid contact pin. Grid contact pin is arranged more steeply, opening in the middle of then is more little, because needing more grid contact pin when relatively high attack angle for enough area coverings, it surrounds near center of rotation, thus improve the repetitive rate of grid contact pin when rotary speed is constant.
According to another aspect of the present utility model, grid contact pin has constant area covering in basal plane. Thus, grid bar the size of the radiation channel formed remains fixed value in centre. In the large area being that of avoiding in basal plane to have relatively low or higher grid density. Which ensure that, the scatter suppression of scatter-grid and imaging characteristic are in basal plane and are likely to be uniform around the open outside at center. Constant area covering can be realized by the different measure being described below.
According to another aspect of the present utility model, the number such as Under The Grille contact pin increases along with radius r, these grid contact pin and intersecting around the circle that the center M of basal plane, radius are r in basal plane, wherein Rmin< r��Rmax. This aspect is compensated by following true, i.e. especially at logarithmic helix, but also in the grid contact pin on other is spiral-shaped, the interval between adjacent grid contact pin increases continuously along with radius r. Grid contact pin in the perimeter causing scatter-grid is thinned out by this. Inventor it is now appreciated that, it is possible to resisting this rarefaction, and thus can realize the area covering of substantial constant, method is, from center, from radius RminRising, the outer shroud week towards scatter-grid adds more grid contact pin along with the radius r increased. These are added or the grid contact pin that supplemented extends also along spiral tracks, and the limit of this track is similarly positioned in the center of scatter-grid. Especially, these interpolations or supplementary grid contact pin are to extend on the helical curve identical with the grid contact pin started in small radii r situation.
According on the other hand, at radius r > RminThe starting point of the grid contact pin started in situation is random distribution in its angle position relative to each other. In other words, from little radius r to big radius, first the angle interval of grid contact pin is determined at random. This causes better being uniformly distributed of grid contact pin equally.
According to an alternative aspects, at radius r > RminThe starting point of the grid contact pin started in situation is spaced with the angle �� of 222.5 ��. This angle �� is gold angle. This angle obtains by dividing full-shape according to golden section. It was recognized by the inventor that by repeatedly rotating with this gold angle, then always form new angle position, thus, as, in each surd situation, never produced overlapping completely at this. In other words, thus all grid bars extend along helical curve, but respectively along coordinate alone. Thus, grid contact pin being uniformly distributed in basal plane is further improved.
In order to further close to grid contact pin being uniformly distributed in basal plane, another aspect of the present utility model is provided with such scatter-grid, when this scatter-grid, at radius r > RminIn situation start, on the helical curve of dextrorotation extend grid contact pin starting point between angle interval and on left-handed helical curve extend grid contact pin starting point between angle interval different.In a preferred configuration, the angle interval to each other of all grid contact pin on the helical curve of dextrorotation is all 222.5 ��, and the angle interval of all grid contact pin on left-handed helical curve is all 156.816 ��. This second mentioned angle also stops the overlap of grid contact pin effectively.
Having pitch different from each other according to another aspect of the present utility model, dextrorotation and left-handed helical curve, this contributes to grid contact pin being uniformly distributed in basal plane.
According to another aspect of the present utility model, at radius r > RminThe radius of the starting point of the grid contact pin started in situation is respectively different. In other words, being provided with according to this aspect, each grid contact pin is at radius r=R different, aloneindUpper beginning. This similarly helps to grid contact pin and is better uniformly distributed. This, different radius RindCan random distribution or be spaced fixing. In the modification of an alternative, multiple radiuses can correspond respectively to multiple, i.e. at least two starting point of grid contact pin. Even if in this case, radius can also random distribution or incrementally select. The combination of two modification is equally possible.
According to another aspect of the present utility model, it is also possible to by making from radius r > RminThe starting point of the grid contact pin started lays respectively at the stability significantly improving scatter-grid in a grid contact pin. Thus produce the intersection point added and the stability improving grid contact pin.
Scatter-grid according to another aspect of the present utility model particularly effectively works, because grid contact pin is made up of one of following material: lead, tungsten, molybdenum and tantalum. Tantalum has the absorption characteristic of the best at this, but is the most expensive in material. Preferably tungsten is used for grid contact pin.
According to another aspect of the present utility model, the radiation channel of scatter-grid is air or paper wad fills. Both ensure that, X-radiation unobstructed can be propagated in one of radiation channel, because both materials or hardly with X-radiation do not interact.
According to another aspect of the present utility model, when scatter-grid is before X-radiation side is upwardly arranged at x-ray radiation detector, the basal plane of scatter-grid is substantially perpendicular to X-radiation direction. The rotation of scatter-grid carries out equally in this plane. This upright position relates to the central ray of x-ray radiation source. Typically, the X-ray tube sending taper or fan-like pattern X ray is herein related to. Then ensure that, the major part of primary X-ray radiation can pass through scattering wave filter, and the major part of scattering is scattered grid and absorbs.
According to another aspect of the present utility model, when scatter-grid is before X-radiation side is upwardly arranged at x-ray radiation detector, grid contact pin is arranged essentially parallel to X-radiation direction and aligns. Thus also ensure that the major part of primary X-ray radiation can pass through scattering wave filter, and the major part of scattering is scattered grid and absorbs.
This utility model further relates to a kind of radioscopic image capture apparatus, and it includes x-ray radiation detector and according to scatter-grid of the present utility model.
According to another aspect of the present utility model, radioscopic image capture apparatus is with the form of C-arm X-ray equipment, and wherein, x-ray radiation detector is configured to planar type detector. In other words, x-ray radiation detector is flat detector, as especially in C-arm X-ray equipment and for insertion type imaging time.
According to last aspect of the present utility model, the basal plane of x-ray radiation detector and scatter-grid etc. is big. Scatter-grid has circular basic shape, and x-ray radiation detector is generally of square basic configuration. This aspect represents between scatter-grid area covering and the absolute dimension of scatter-grid to x-ray radiation detector best as far as possible compromise. Thus can material saving and utilize detector area as optimally as possible.
Accompanying drawing explanation
It is described in detail by the embodiment shown in accompanying drawing below and sets forth this utility model. Wherein:
Fig. 1 illustrates according to an embodiment of the present utility model, C-arm apparatus-form radioscopic image capture apparatus,
Fig. 2 illustrates according to another embodiment, distribution that grid contact pin is on the scatter-grid basal plane with circular basic shape,
Fig. 3 illustrates according to another embodiment, distribution that grid contact pin is on the scatter-grid basal plane with circular basic shape,
Fig. 4 illustrate according to another embodiment, grid contact pin on the basal plane of scatter-grid according to the distribution of gold angle, and
Fig. 5 illustrates according to another embodiment, scatter-grid and x-ray radiation detector schematic overlapping.
Detailed description of the invention
Fig. 1 diagrammatically illustrates the X-radiation equipment of C-arm system form, and it includes at least one C-arm rotatably disposed on support C arm 4 in other words. This C-arm has the high-voltage generator for producing X ray voltage. In C-arm, one end is mounted with x-ray radiation source 6, such as x-ray radiator or X-ray tube. The other end is mounted with x-ray radiation detector 5 thereon, from the X-radiation direction of x-ray radiation source 6s, is arranging circle, rotatable scatter-grid 9 before this x-ray radiation detector 5. Scatter-grid 9 is fixing with x-ray radiation detector 5 to be connected, or a formed unit, thus the motion of x-ray radiation detector 5 is also implemented by scatter-grid 9. Scatter-grid is arranged on before x-ray radiation detector 5 with the interval of 10mm. This interval ensure that the basal plane of scatter-grid 9 can rotate freely before x-ray radiation detector 5, and minimized by the X-radiation revealed lateral between x-ray radiation detector 5 and scatter-grid 9 simultaneously. The basal plane of scatter-grid 9 is arranged with being parallel to the detector face of x-ray radiation detector 5. Electromotor or the driving of scatter-grid 9 are not shown specifically in FIG, but it is arranged in scatter-grid side. Driving can electromagnetically or mechanically carry out. At this, the driving of rotation can consider the distortion caused due to gravity of C-arm automatically. The support keeping C-arm can be fastened on the floor of inspection chamber, on ceiling or on side wall. C-arm 4 can also control to guide in other words by robot 8. X-ray radiation detector 5 is substantially configured to right angle in this embodiment. Certainly, it is also contemplated that other shape, especially square in scope of the present utility model. But for all shapes of x-ray radiation detector 5, the area ratio of scatter-grid 9 and x-ray radiation detector 5 is all 1, in order to realize optimal compromise possible between the utilization and the absolute area of scatter-grid 9 of detector area. This schematically shows in Figure 5. Scatter-grid 9 has circular basal plane, and x-ray radiation detector 5 has square detector face. The basal planes of detector face and scatter-grid etc. are big. If the diameter of scatter-grid 9 15 is equal to the diagonal 16 of x-ray radiation detector 5, although then whole detector face is scattered grid 9 and covers and can use for imaging, but this diameter is longer by 41% than the side 17 of detector face, this will imply that the materials demand significantly improved for scatter-grid 9.If the diameter 15 of scatter-grid 9 is isometric with the side 17 of x-ray radiation detector 5 on the contrary, although then the materials demand of scatter-grid 9 is less, but about 1/4th of detector face are not scattered grid 9 and cover and be thus lost for imaging. If the areas of scatter-grid 9 and x-ray radiation detector 5 etc. are big, although then lacking the covering undertaken by scatter-grid 9, but in the rational situation of the material outlay of scatter-grid 9, only lost the detector face (thick shadow region) of about 9%, the diameter 15 of this scatter-grid than the side 17 of x-ray radiation detector 5 grow up about 12% and its in little scope, only protrude from detector face (thin shadow region). X-ray radiation detector 5 is flat detector, semiconductor detector especially flat, that be preferably made up of unsetting silicon (aSi). They are nowadays on a large scale suitable in many fields of X-ray technology, for instance in radiograph or in insertion type angiography and cardiology. The light path of x-ray radiation source 6 exists patient table 3 for holding patient 7 to be checked. Being also associated with picture system 2 on radioscopic image capture apparatus, it receives and processes the picture signal of x-ray radiation detector 5. Then picture signal after process can show on the display device 1 be connected to picture system 2. X-ray radiation source 6 sends the beam of the radiation from x-ray radiation source 6, and it penetrates patient 7. Beam has taper at this, and in other words, X ray launches along with increasing with radiation distance. The basal plane of scatter-grid 9 and the detector face of x-ray radiation detector 5 are located normal in the plane of central ray of this beam. The bodily tissue of X-radiation and patient 7 interacts. Thus, X-radiation is attenuated on the one hand and forms scattering on the other hand at this, and it leaves the health of patient 7 along any aspect. Primary radiation after decay and the scattered portion launched towards x-ray radiation detector 5 direction hit scatter-grid 9, and it absorbs scattering to a great extent and allows the major part of primary radiation to pass through. Next the X-radiation that unscattered grid 9 absorbs hits x-ray radiation detector 5. X-ray radiation source 6 and the unit that is made up of scatter-grid 7 and x-ray radiation detector 5 when image taking respectively around the patient 7 on patient table 3 to be checked, be arranged in rotation etc. in the minds of body region run, for making x-ray radiation source 6 and the described unit on the not homonymy of body region always opposed. Radioscopic image capture apparatus can be constructed as setting up three-dimensional data group. Radioscopic image capture apparatus especially can work by cardiac phase when being used in angiography with triggering, and has the cardiac phase for measuring patient for this purpose and for controlling the EKG unit of image taking according to measured cardiac phase. Additionally, radioscopic image capture apparatus can have contrast agent gives unit, patient 7 use is matched with the contrast agent of this imaging, especially Iodine contrast medium also according to measured cardiac phase by it.
With reference now to Fig. 2 to 5, scatter-grid 9 is described in detail.
Fig. 2 illustrates the first embodiment of scatter-grid 9, and it has the grid contact pin 10 first distribution in its basal plane. This diagram is not drawn to, and is only used for illustrating elaboration. The grid contact pin 10 being shown in which extends on logarithmic helical orbit, and wherein the limit of this helical orbit is always located in the center M of scatter-grid 9.Logarithmic helix all have in this embodiment identical, be the pitch of 1. In other words, pitch angle alpha in this case ��=45 ��. Hole 11 shape, mean radius be RminOpening around the center M of scatter-grid 9, this hole is absent from grid contact pin 10, or only exists the starting point connected of grid contact pin 10 for stability reasons. RminIn grid contact pin 10 only have when scatter-grid 9 rotates only small, by the speed of the image rate significantly lower than radioscopic image capture apparatus. Thus will result in not rectifiable image artifacts. In order to avoid this, this hole must have certain size, the pitch of the helix that its angle of attack depending on grid contact pin 10 or grid contact pin 10 extend thereon, and be accompanied by this, at radius r=RminThe number of situation Under The Grille 10. The pitch of helix is more big, then in order to realize desired area covering and at radius r=RminThe number of situation Under The Grille contact pin is also more big, and RminMore little, vice versa. Currently, when helical angle is ��=45 ��, hole 11 has the size for 10mm. Imaging artefacts recoverable in this formation. Correctable equally by corresponding software engineering measure, due to the signal intensity of raising that substantially can unhinderedly be formed by the scattering in hole 11 or brightness of image in this region of radioscopic image shooting. This is but tolerable.
The interval of logarithmic helix increases radially outward. But, RminOutside grid contact pin 10 has the area covering of approximately constant, is such as the area covering of 10% at this. This point can realize being because at radius r > RminMore grid contact pin 10 is added on helical orbit by when continuously. The number of grid contact pin increases continuously until maximum radius Rmax. With reference to Fig. 4 grid contact pin 10 increasing with radius r detailed below. Grid contact pin 10 extends in this embodiment in dextrorotation and left-handed helical orbit. Thus obtain multiple intersection point 12. It is capable of constructing for the self-supporting of scatter-grid 9. Additionally, the intersection point 13 of other stabilisation is thus produced so that at radius r > RminWhen the starting point of grid contact pin 10 added be positioned in grid contact pin existing, other. The radiation channel 14 having transmission X-ray to radiate respectively between grid contact pin 10 that is adjacent or that intersect. Its average-size is about 1mm to 2mm in this embodiment.
The diameter of scatter-grid is between 200mm and 300mm, it is preferred to 250mm. Grid contact pin 10 has thickness or the wall thickness of 100 ��m and the height of about 20mm.
The self-supporting according to this embodiment based on scatter-grid 9 constructs, it is possible to such as manufacture by lf technique. In lf technique, by pulverous pending material, such as it is laid on substrate with thin layer for tungsten or lead at this. By fully remelted partly by laser emission for dusty material and form fixing material layer after solidification. It follows that sunk with the numerical value of thickness by substrate, and again lay powder. This cycle repeats always, until by remelted for all layers. The typical layer thicknesses of all material is 15 ��m to 150 ��m. Data for guided laser bundle such as produce by software from the three-dimensional CAD body model of scatter-grid 9. Model partition is monolayer by the first calculation procedure. In the second calculation procedure, produce, for each layer, the track (vector) that laser beam is advanced.In order to avoid material oxidation forms pollutant, this technique carries out in the protective gas atmosphere have argon or nitrogen.
Before the use, it is possible to the additionally scatter-grid 9 made by post processing, in order to such as unnecessary material powder is removed, with rejection image artifact. What be adapted as post-processing approach is such as that the mineral in granular form medium with such as corundum, glass, silicon or plastics is to carry out high-pressure injection. Equally possible carry out high pressure cleaning with air or water.
Fig. 3 illustrates another embodiment of scatter-grid 9, and it has the grid contact pin 10 distribution different from shown in Fig. 2 in basal plane. Currently, grid contact pin extends on the logarithmic of pitch angle alpha=70 ��, dextrorotation and left-handed helical orbit. It means that grid contact pin 10 has the substantially steeper angle of attack, and thus have better access to radially trend. In order to realize desired, in this case 15% area covering, in this embodiment from radius RminStart just there has been significantly more grid contact pin 10. Hole 11 around the center M of scatter-grid can may be significantly smaller when not strengthening artifact, this reduces the share of the scattering of transmission. Generally, the average area that may be significantly smaller of scatter channel 14 is obtained according to this embodiment.
Fig. 4 illustrate according to another embodiment of the present utility model, grid contact pin 10 on the basal plane of scatter-grid 9 according to the distribution of gold angle. Grid contact pin 10 here also extends on logarithmic helix. Grid contact pin 10 increases along with radius r and increases. From clockwise direction, the angle interval of ��=222.5 �� that starting point is respectively provided with and gold angle is corresponding of grid contact pin 10 to be added accordingly. In other words, fill from the starting point of grid contact pin 10 radius 18s, hole between existing grid contact pin 10 time, determine radius 19 along clockwise direction, it takes ��=222.5 ��, angle interval in the clockwise direction. On these radiuses 19, the starting point of that there is other, to be added grid contact pin 10.
From radius 19s, repeat described method, and correspondingly on radius 20 etc., add ensuing grid contact pin 10, until meeting desired area covering. Substitute and can also carry out in the counterclockwise direction clockwise. Left-handed and dextrorotation grid contact pin can be added along clockwise direction or counterclockwise. As an alternative, add left-handed grid contact pin 10 along clockwise direction and add the grid contact pin 10 of dextrorotation in the counterclockwise direction, otherwise or.
Claims (20)
1. the scatter-grid (9) for radioscopic image capture apparatus, for before X-radiation side is upwardly arranged at x-ray radiation detector (5), wherein, it is r=R that described scatter-grid has radiusmaxCircular basal plane, described scatter-grid is configured to and can rotate around the center (M) of scatter-grid, and described scatter-grid includes the radiation channel (14) of multiple transmission X-ray radiation in basal plane, wherein, described radiation channel is to be formed by multiple grid contact pin (10) entirely around it, and described grid contact pin extends along helical curve respectively in basal plane.
2. scatter-grid according to claim 1, it is characterised in that the limit of helical curve is positioned at the center of circular basal plane.
3. scatter-grid according to claim 1, it is characterised in that helical curve dextrorotation and left-handed extend.
4. scatter-grid according to claim 1, it is characterised in that helical curve is the helix of plane, logarithmic.
5. scatter-grid according to claim 1, it is characterised in that it is r=R that this scatter-grid has radius around the center of basal planemin, the circular open (11) not having grid contact pin.
6. scatter-grid according to claim 5, it is characterised in that grid contact pin has constant area covering in basal plane.
7. scatter-grid according to claim 6, it is characterised in that with the center around basal plane in basal plane, radius be that the number of the grid contact pin that the circle of r intersects increases along with radius r, wherein Rmin<r��Rmax��
8. scatter-grid according to claim 7, it is characterised in that be r > R at radiusminWhen the starting point of grid contact pin that starts be randomly located relative to one another in its Angle Position.
9. scatter-grid according to claim 7, it is characterised in that be r > R at radiusminWhen the starting point of grid contact pin that starts be spaced with angle ��=222.5 ��.
10. scatter-grid according to claim 7, it is characterised in that be r > R at radiusminWhen start, on the helical curve of dextrorotation extend grid contact pin starting point with on left-handed helical curve extend grid contact pin starting point each other at different angles interval arrangement.
11. scatter-grid according to claim 3, it is characterised in that dextrorotation and left-handed helical curve have pitch identical or different from each other.
12. the scatter-grid according to any one of claim 7 to 11, it is characterised in that be r > R at radiusminWhen the radius of starting point of grid contact pin that starts respectively different.
13. the scatter-grid according to any one of claim 7 to 11, it is characterised in that be r > R at radiusminWhen the starting point of grid contact pin that starts be each positioned in a grid contact pin.
14. the scatter-grid according to any one of claim 7 to 11, it is characterised in that grid contact pin is formed by the one in following material: lead, tungsten, molybdenum and tantalum.
15. the scatter-grid according to any one of claim 7 to 11, it is characterised in that radiation channel is air or paper wad fills.
16. the scatter-grid according to any one of claim 7 to 11, it is characterised in that when scatter-grid is before X-radiation side is upwardly arranged at x-ray radiation detector, the basal plane of scatter-grid is substantially perpendicular to X-radiation direction.
17. the scatter-grid according to any one of claim 7 to 11, it is characterised in that when scatter-grid is before X-radiation side is upwardly arranged at x-ray radiation detector, grid contact pin constructs with being arranged essentially parallel to X-radiation direction.
18. a radioscopic image capture apparatus, including x-ray radiation detector (5) and the scatter-grid (9) according to any one of claim 1 to 17.
19. radioscopic image capture apparatus according to claim 18, it is characterised in that described radioscopic image capture apparatus is with the form of C-arm X-ray equipment.
20. the radioscopic image capture apparatus according to claim 18 or 19, it is characterised in that the basal plane of x-ray radiation detector and the basal plane of scatter-grid etc. are big.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520696546.5U CN205286379U (en) | 2015-08-05 | 2015-08-05 | A rotatable scattering grid that is used for X ray image to shoot equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520696546.5U CN205286379U (en) | 2015-08-05 | 2015-08-05 | A rotatable scattering grid that is used for X ray image to shoot equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107509296A (en) * | 2016-06-14 | 2017-12-22 | 西门子医疗有限公司 | For movably suspending device, the arrangement with x-ray grid and the method for operating x-ray grid of x-ray grid |
| EP3574834A1 (en) | 2018-05-30 | 2019-12-04 | Siemens Healthcare GmbH | Anti-scatter grid for a medical x-ray device |
| CN110960239A (en) * | 2018-09-28 | 2020-04-07 | 西门子医疗有限公司 | Anti-scatter-grid for medical X-ray imaging apparatus |
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2015
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107509296A (en) * | 2016-06-14 | 2017-12-22 | 西门子医疗有限公司 | For movably suspending device, the arrangement with x-ray grid and the method for operating x-ray grid of x-ray grid |
| US10541062B2 (en) | 2016-06-14 | 2020-01-21 | Siemens Healthcare Gmbh | Apparatus for movably suspending an x-ray grid, arrangement with an x-ray grid and method for operating an x-ray grid |
| EP3574834A1 (en) | 2018-05-30 | 2019-12-04 | Siemens Healthcare GmbH | Anti-scatter grid for a medical x-ray device |
| CN110960239A (en) * | 2018-09-28 | 2020-04-07 | 西门子医疗有限公司 | Anti-scatter-grid for medical X-ray imaging apparatus |
| CN110960239B (en) * | 2018-09-28 | 2024-03-29 | 西门子医疗有限公司 | Anti-scatter grid for medical X-ray imaging device |
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