CN104795122B - The choosing method of collimater, radiating system and collimators vanes - Google Patents

The choosing method of collimater, radiating system and collimators vanes Download PDF

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Publication number
CN104795122B
CN104795122B CN201410231053.4A CN201410231053A CN104795122B CN 104795122 B CN104795122 B CN 104795122B CN 201410231053 A CN201410231053 A CN 201410231053A CN 104795122 B CN104795122 B CN 104795122B
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curve
penumbra
curvature
radius
blade
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CN104795122A (en
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李贵
刘娟
刘艳芳
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Shanghai United Imaging Healthcare Co Ltd
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Shanghai United Imaging Healthcare Co Ltd
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Priority to CN201710671277.0A priority patent/CN107362463B/en
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
    • A61N5/1042—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy with spatial modulation of the radiation beam within the treatment head
    • A61N5/1045—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy with spatial modulation of the radiation beam within the treatment head using a multi-leaf collimator, e.g. for intensity modulated radiation therapy or IMRT
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computerised tomographs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computerised tomographs
    • A61B6/037—Emission tomography
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
    • A61N2005/1092—Details

Abstract

A kind of choosing method of collimater, radiating system and collimators vanes.The collimater includes more than two blades, and the blade is oppositely arranged in two arrays, and each array includes more than one blade；The blade includes an extended structure body, and it is the first shaped form that the extended structure body, which includes the first end being oppositely arranged along bearing of trend and the second end, the first end end surface shape,.By the way that the end surface shape of collimators vanes first end is arranged into the first shaped form, it can make it that caused penumbra change is more uniform, so that the first shaped form collimater is more beneficial for carrying out radiotherapy.

Description

The choosing method of collimater, radiating system and collimators vanes
Technical field
The present invention relates to technical field of medical equipment, and in particular to a kind of collimater, radiating system and collimators vanes Choosing method.
Background technology
Collimater is the Medical Devices for producing conformal radiation field size, that is, limits treatment radiation exposure caused by radioactive source and exist Scope on patient body-surface, so as to protect the normal organ of patient or tissue not raying.Collimater is led in radiotherapy Had a wide range of applications in domain.
Collimater generally includes multiple blades, and the multiple blade is arranged in two arrays, forms multipair relative leaf Piece.Each blade of a pair of blades can move to the direction of another blade remote or in the pair of blade, two The adjacent blades of array can limit one or more spaces after being positioned to.Blade can stop that the part of radioactive source is penetrated Line, the ray not being blocked are then radiated on the body surface of patient through the space that blade is limited., can be with by the motion of blade Produce satisfactory radiation field size.
Penumbra can not produced in the body surface of patient by the radiation exposure of leaf baffle.Penumbra is bigger, then patient's is normal The radiation that organ or tissue is subject to is also bigger.The change of penumbra is uneven, then is unfavorable for being corrected radiation field size.But The problem of penumbra is larger and the change of penumbra is uneven be present in existing collimater.
The content of the invention
The problem of what the embodiment of the present invention solved is that penumbra caused by existing collimater is larger and penumbra change is uneven.
To solve the above problems, the embodiment of the present invention provides a kind of collimater, the collimater includes more than two leaves Piece, the blade are oppositely arranged in two arrays, and each array includes more than one blade；The blade includes one Extended structure body, the extended structure body include first end and the second end being oppositely arranged along bearing of trend, the first end end Face is shaped as the first shaped form, and first curve is the smooth curve that radius of curvature becomes larger from summit along bearing of trend.
Alternatively, first curve includes：For represent even function curve and it is described be used for represent even function Curve of the curve after translation or rotation transformation.
Alternatively, first curve is two end points that short axle is connected on parabola, hyperbolic cosine curve or ellipse Camber line.
Alternatively, the extended structure body is plane development piece.
Alternatively, each array includes two and with blade.
Alternatively, concaveconvex structure is provided with the extended structure body, the concaveconvex structure of adjacent two blade mutually plugs together.
Alternatively, each array includes a blade.
The embodiment of the present invention also provides a kind of radiating system, including：For producing the radioactive source of ray, and described above Collimater, the first end of the blade of the collimater are the one of the close another array relative with array where the blade End, the blade are later used to limit space being positioned, and ray caused by radioactive source is limited through the blade of collimater Space is irradiated to target area.
The embodiment of the present invention also provides a kind of choosing method of multi-diaphragm collimator blade, and methods described includes：
A. first curvature radius is determined：
In the case of same radioactive source, the blade of the circular arc end face with different curvature radius is obtained in motion when institute Corresponding first penumbra curve, the intersection point of the symmetry axis of the circular arc and the circular arc is origin；
Choose that numerical value in the first penumbra curve is smaller and shallower the first penumbra curve of change, selected first The radius of curvature of penumbra curve is first curvature radius；
B. the first degree of crook is determined：
In the case of same radioactive source, obtain using origin as summit and different the second shaped form end face of degree of crook The blade second penumbra curve corresponding in motion, second curve are that radius of curvature gradually becomes from summit along bearing of trend Big smooth curve, the radius of curvature of the apex are first curvature radius, adjacent two sampled point on second curve The difference of radius of curvature is identical；
Choose that numerical value in the second penumbra curve is smaller and shallower the second penumbra curve of change, selected second The degree of crook of second curve corresponding to penumbra curve is the first degree of crook；
C. the first summit is determined：
In the case of same radioactive source, obtain using the first curvature radius as the radius of curvature of apex and with not With the blade of the 3rd shaped form end face on the summit threeth penumbra curve corresponding in motion, the summit of the 3rd curve is set Be placed in the origin and the reference axis vertical with the symmetry axis of the 3rd curve, the 3rd curve be radius of curvature from The smooth curve that summit becomes larger along bearing of trend, and the degree of crook of the 3rd curve and the first degree of crook phase Together；
Choose that numerical value in the 3rd penumbra curve is smaller and shallower the 3rd penumbra curve of change, the selected the 3rd Summit corresponding to penumbra curve is the first summit；
d：Determine the first curve：
By the first curve that the radius of curvature with first summit and first apex is first curvature radius Blade of the blade of shape end face as the collimater, first curve are that radius of curvature gradually becomes from summit along bearing of trend Big smooth curve, and the degree of crook of first curve is identical with first degree of crook.
Alternatively, first curve, the second curve and the 3rd curve be curve for representing even function or Curve of the curve for being used to represent even function after translation or rotation transformation.
Alternatively, first curve, the second curve and the 3rd curve are parabola, hyperbolic cosine curve or ellipse The camber line of two end points of short axle is connected on circle.
Compared with prior art, the technical scheme of the embodiment of the present invention has advantages below：
By the way that the end surface shape of blade first end is arranged into the first shaped form, the blade can be caused to stop ray When being radiated at the body surface of patient, relative to the blade of existing linear end surface shape, the length of penumbra subtracts caused by irradiation It is small, and add the blade of tangent line shape end surface shape relative to existing circular arc, caused penumbra change is more uniform.Therefore, originally Multi-diaphragm collimator in inventive embodiments is more beneficial for carrying out radiotherapy.
Brief description of the drawings
Fig. 1 is the radiating system structural representation in the embodiment of the present invention；
Fig. 2 is the schematic cross-section of collimators vanes in the embodiment of the present invention；
Fig. 3 is the flow chart of the choosing method of collimators vanes in the embodiment of the present invention；
Fig. 4 is the penumbra curve data figure that the method in Fig. 3 obtains.
Embodiment
In actual applications, during irradiation on the size of caused penumbra and collimators vanes it is close with where the blade The end surface shape of one end of the relative another array of array certain relation be present, will be close with the blade on the blade First end of the one end of the relative another array of the array at place as the blade.
At present, generally the end surface shape of the blade first end is arranged to following two：
The first, referring to the Chinese patent that number of patent application is 201220426615.7, by the first end of the blade End surface shape is arranged to linear end face.Because the curvature of linear end is 0, and connect on blade with the linear end face The curvature at tactile both ends is larger, therefore, with the linear motion of blade, when ray caused by radioactive source is by the straight line of blade When shape end face is irradiated to the both ends with the linear end contact on blade, position of the radiation exposure on the blade The curvature at place can the two contact opening position suddenly change it is larger, cause caused by penumbra change it is uneven, be unfavorable for into Row radiotherapy.Also, the average length of penumbra is also larger caused by the blade with linear end surface shape, so as to cause The normal organ or tissue of patient is by bigger radiation；
Second, referring to the United States Patent (USP) that patent publication No. is 5166531, the end face of the first end of the blade is formed It is arranged to circular arc and adds tangent line shape.Because the curvature of circular arc end is constant, and the curvature of tangent line end from arc contact One end first reduces to one end away from circular arc and increased afterwards, therefore, with the linear motion of blade, when ray caused by radioactive source When being irradiated to tangent line end by circular arc end, caused penumbra first increases, then reduces, and rear to increase again, i.e., circular arc, which adds, cuts The Curvature varying of linear end face is discontinuous, causes caused penumbra change uneven, is unfavorable for being corrected radiation field size.
In view of the above-mentioned problems, the embodiment provides a kind of collimater, the end of the collimators vanes first end Face is shaped as the first shaped form.So, in specific application, the blade of the collimater in the embodiment of the present invention is relative to straight The blade of linear end surface shape, caused penumbra length are smaller and evenly.Also, the collimater in the embodiment of the present invention Blade is more uniform relative to the blade for adding tangent line shape end surface shape with circular arc, the change of caused penumbra.Therefore, this hair Collimater in bright embodiment is more beneficial for carrying out radiotherapy.
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings to the present invention Specific embodiment be described in detail.
As shown in figure 1, the embodiment provides a kind of radiating system.The radiating system includes frame 10.Machine Radioactive source 120 and collimator system 130 are provided with the head 110 of frame 10.Wherein, collimater is arranged on the collimater system Inside system 130.Radioactive source 120 can produce the ray 140 for carrying out radiation treatment to patient.
In specific implementation, patient is placed on examination couch 150.With the movement of examination couch 150, ray 140 is collimated The conformal radiation field size that device is formed, is radiated on target area, is controlled so as to carry out radioactivity to the lesions position of patient's body Treat.
As shown in Fig. 2 in the embodiment of the present invention, the collimater includes more than two blades 20.The blade 20 wraps Include an extended structure body 210.The extended structure body 210 includes the end of first end 220 and second being oppositely arranged along bearing of trend 230.Wherein, the end surface shape of the first end 220 is the first shaped form, and first curve is that radius of curvature is prolonged from summit edge Stretch the smooth curve that direction becomes larger.
The end surface shape of the first end 220 is arranged to the first shaped form, relative to existing by the first end 220 End surface shape be arranged to linear, due to the first shaped form end radius of curvature be more than 0, therefore blade straight line transport It is bent when ray caused by radioactive source is irradiated on blade the both ends with first end in contact from first end end in dynamic The change of rate radius is relatively small so that the change of caused penumbra is also relatively small, i.e. the change of penumbra is more uniform.And And because the radius of curvature of first curve becomes larger from summit along bearing of trend, there is the leaf of the first shaped form end face Piece, relative to the blade with linear end face, can make it that the average length of caused penumbra is smaller in linear motion.
The end surface shape of the first end 220 is arranged to the first shaped form, relative to existing by the first end 220 End surface shape be arranged to circular arc and add tangent line shape, because the radius of curvature of the first shaped form end is consecutive variations, therefore The change of penumbra is more uniform caused by can causing.
In specific implementation, the blade 20 is arranged in two arrays, forms multipair relative blade 20.Each blade 20 first end 220 is positioned close to one end of another array relative with the array where the blade 20.Each pair is relative Blade 20 moves each along the direction vertical (referring to Fig. 1) with the center line 1402.The blade 20 institute after being positioned to The space of restriction can form conformal radiation field size, so that ray 140 is more accurate (referring to Fig. 1) caused by radioactive source Ground is radiated on target area.
In specific implementation, first curve can include being used for the curve for representing even function.Such as first song Line can be the camber line for two end points that short axle is connected on parabola, hyperbolic cosine curve or ellipse.First curve is also Curve of the curve for being used to represent even function after translation or rotation transformation can be included.For example first curve can Be parabola through translation or rotation transformation or curve, curve of the hyperbolic cosine curve after translation or rotation transformation, or The curve after the camber line translation or rotation transformation of two end points of short axle is connected on person's ellipse.
It should be noted that described be used to represent that the curve of even function can be intended to indicate that the curve of an even function, The curve of the linear combination of multiple even functions can also be intended to indicate that.The curve for being used to represent even function is through translating or revolving Change the curve after changing, can be curve of the curve for being used to represent even function after translation or rotation transformation, can also It is that multiple curves for representing even function carry out the curve of linear combination again after translation or rotation transformation respectively.
It should be noted that the end surface shape at second end 230 can have any shape, it is not construed as limiting herein.Such as The end surface shape at second end 230 can be arranged to the end surface shape identical shape with first end 220.
It should be noted that the shape of the extended structure body 210, which is set, to be arbitrary shape, do not limit herein It is fixed.Such as the extended structure body 210 is plane development piece.Wherein described plane development piece can be rectangle.
In specific implementation, in two arrays where the blade, each array can only have a blade respectively, There can be the blade of two and the above respectively., can be in the extension when each array has the blade of two and the above respectively Concaveconvex structure is set on structure 210 so that mutually plugged together with the concaveconvex structure between adjacent two blade of an array, with more preferable Ground meets the requirement for the treatment of.
As shown in figure 3, embodiments of the invention additionally provide a kind of choosing method of collimators vanes, methods described is being incited somebody to action The first end end surface shape of collimators vanes be arranged to first it is curved in the case of, from different summits or radius of curvature In the blade of first shaped form end face, the blade that penumbra length is relatively small and change is relatively uniform is chosen, preferably to meet The requirement for the treatment of.Methods described can include：Step a；Determine first curvature radius；Step b：Determine the first degree of crook；Step Rapid c：Determine the first summit；And step d：Determine the first curve.
In specific implementation, the step a can include step 310 and step 320, wherein：
Step 310：In the case of same radioactive source, obtain the blade with the circular arc end face without radius of curvature and exist The first corresponding penumbra curve during motion, the intersection point of the symmetry axis of the circular arc and the circular arc is origin.
Due to the radius of curvature all same at any point on circular arc, therefore, by the symmetry axis of the circular arc and the circular arc Intersection point be arranged to origin, choose different radius of curvature, you can obtain different circular arcs.With different circular arc end faces Blade can produce penumbra in motion process.Measure penumbra value caused by the diverse location place of the blade, you can obtain more Bar the first penumbra curve.
It should be noted that in conventional two dimension (or three-dimensional) rectangular coordinate system, there are two (or three) mutual respectively Vertical reference axis.The origin is the intersection point of each reference axis, and coordinate is (0,0) (or (0,0,0)), and the origin will Each reference axis is divided into two sections, and the coordinate in origin side is on the occasion of opposite side is then negative value.
Fig. 4 be collimater blade in diverse location corresponding penumbra curve, wherein, abscissa in Fig. 4 represents leaf For piece to the distance of radiation source center line, ordinate represents corresponding penumbra value during blade movement to diverse location.Such as Fig. 4 institutes Show, when radius of curvature is equal to 5.5cm, the first obtained penumbra curve is data wire 1.When radius of curvature is equal to 6cm, obtain The first penumbra curve be data wire 2.When radius of curvature is equal to 6.25cm, the first obtained penumbra curve is data wire 3.
Step 320：The first penumbra curve that numerical value in the first penumbra curve is smaller and change is shallower is chosen, it is selected The radius of curvature of the first penumbra curve taken is first curvature radius.
From being obtained by step 310 in a plurality of first penumbra curve, choose that penumbra numerical value is smaller and change is shallower the One penumbra curve.
As shown in figure 4, in data wire 1, data wire 2 and data wire 3, numerical value is smaller and change is shallower the first half Shadow curve is data wire 2, now at the first penumbra hump corresponding to radius of curvature be 6cm, i.e. first curvature radius For 6cm.
The step b can include step 330 and step 340, wherein：
Step 330：In the case of same radioactive source, obtain using origin as summit and different the second curve of degree of crook The blade of shape end face corresponding second penumbra curve in motion, second curve are radius of curvature from summit along extension side To the smooth curve become larger, the radius of curvature of the apex is first curvature radius, adjacent two on second curve The difference of radius of curvature between sampled point is identical.
In an embodiment of the present invention, the summit is the point that radius of curvature is minimum on curve.When the curve be for When representing the curve of the curve or the curve for being used to represent even function of even function after translation or rotation transformation, the top Point is the point intersected on second curve with the symmetry axis of second curve.Between the selection of the radius of curvature of the apex Every being not construed as limiting, those skilled in the art can be chosen as needed.
The degree of crook is different, i.e., the situation of change of the radius of curvature of every curve is different.Second curve is entered Row equal interval sampling, when the difference of the radius of curvature of adjacent two sampled point is identical, using origin as summit, and cause the summit The radius of curvature at place is first curvature radius, sets the second curve with differently curved degree.Measurement has the second shaped form The blade of end face caused penumbra value in motion, penumbra value of the blade in diverse location is attached, obtained To corresponding second penumbra curve.
Step 340：The second penumbra curve that numerical value in the second penumbra curve is smaller and change is shallower is chosen, it is selected The degree of crook of second curve corresponding to the second penumbra curve taken is the first degree of crook.
Selection penumbra numerical value is smaller in a plurality of second penumbra curve obtained from step 330 and changes shallower second Penumbra curve.Using the degree of crook of the second curve corresponding to the second selected penumbra curve as the first degree of crook.
Step c can include step 350 and step 360, wherein：
Step 350：In the case of same radioactive source, the radius of curvature using the first curvature radius as apex is obtained And the 3rd penumbra curve that the blade of the 3rd shaped form end face with different summits is corresponding in motion, the 3rd curve Summit be arranged in the origin and the reference axis vertical with the symmetry axis of the 3rd curve, the 3rd curve for song The rate smooth curve that partly summit becomes larger along bearing of trend without leave, and the degree of crook of the 3rd curve and described first curved Qu Chengdu is identical.
By step 330, selection penumbra numerical value is smaller from the second penumbra curve by being obtained in step 320 and changes The second shallower penumbra curve, described the is set with the degree of crook of the second curve corresponding to the second acquired penumbra curve Three curves.Also, the radius of curvature at using the first curvature radius as the 3rd hump, chooses different summits Position, you can obtain a plurality of 3rd curve that degree of crook is identical but vertex position is different.
In specific implementation, by the summit of the 3rd curve be arranged at the origin and with pair of the 3rd curve Claim in the vertical reference axis of axle, will the 3rd curve summit abscissa or ordinate be arranged to 0.If cross the origin And the reference axis vertical with the symmetry axis of the 3rd curve is X-axis, then the ordinate on the summit of the 3rd curve is 0.If It is Y-axis to cross the origin and the reference axis vertical with the symmetry axis of the 3rd curve, then the horizontal stroke on the summit of the 3rd curve Coordinate is 0.
It is now excessively described so that excessively described origin and the reference axis vertical with the symmetry axis of the 3rd curve are Y-axis as an example The origin and reference axis parallel with the symmetry axis of the 3rd curve is X-axis, according to obtained first curvature radius and selected The vertex position taken can determine that the 3rd curve.Blade of the measurement with the 3rd shaped form end face caused penumbra in motion Value, penumbra value of the blade in diverse location is attached, and obtains corresponding second penumbra curve.
As shown in figure 4, first curvature radius is 6cm, the abscissa on summit is 0, corresponding when ordinate is 0.10cm Second penumbra curve is data wire 4.First curvature radius is 6cm, and the abscissa on summit is 0, and when ordinate is 0.07cm, institute is right The the second penumbra curve answered is data wire 5.
Step 360：The 3rd penumbra curve that numerical value in the 3rd penumbra curve is smaller and change is shallower is chosen, it is selected Summit corresponding to the 3rd penumbra curve taken is the first summit.
As shown in figure 4, in data wire 4 and data wire 5, numerical value is smaller and the shallower 3rd penumbra curve of change is data wire 5.Using the summit corresponding to data wire 5 as the first summit, i.e., the abscissa on the first summit is 0, ordinate 0.07cm.
First curvature radius is determined by step a, the first degree of crook is determined by step b and determined by step c Behind first summit, step d is performed to determine the first curve, wherein step d includes：
Step 370：It is described first bent by the radius of curvature with the first curvature radius and first apex Blade of the blade of first shaped form end face of rate radius as the collimater, first curve are radius of curvature from summit The smooth curve become larger along bearing of trend, and the degree of crook of first curve is identical with first degree of crook.
According to the first curvature radius determined in step 320, the first degree of crook determined in step 340 and step The first summit determined in 360, you can one first curve is determined, using identified first curve shape as collimators vanes The end surface shape of one end, it can make it that caused penumbra is smaller and change is more uniform.
In specific implementation, first curve, the second curve and the 3rd curve can be used to represent even letter with all Several curve, curve of the curve that all can also be used to represent even function after translation or rotation transformation, can also be portion It is divided into the curve for representing even function, another part is for representing song of the curve of even function after translation or rotation transformation Line, it is not construed as limiting herein.
Wherein, the curve for being used to represent even function can be to be connected on parabola, hyperbolic cosine curve or ellipse The camber line of two end points of short axle.Such as first curve, the second curve and the 3rd curve can with all parabola, The camber line of two end points of short axle is connected on hyperbolic cosine curve or ellipse.
In specific implementation, medical accelerator can be selected as radioactive source.Wherein obtain the first penumbra curve and obtain The second penumbra curve when used radioactive source can be with identical, can also be different, by those skilled in the art's sets itself, herein not It is restricted.
Using the choosing method of the collimators vanes provided in the embodiment of the present invention, can select can produce it is smaller and The blade of first curve shape of the more uniform penumbra of change, and then cause caused penumbra close to constant, therefore more have Beneficial to progress radiotherapy.
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art, this is not being departed from In the spirit and scope of invention, it can make various changes or modifications, therefore protection scope of the present invention should be with claim institute The scope of restriction is defined.

Claims (3)

  1. A kind of 1. choosing method of collimators vanes, it is characterised in that including：
    A. first curvature radius is determined：
    In the case of same radioactive source, the blade for obtaining the circular arc end face with different curvature radius is corresponding in motion The first penumbra curve, the intersection point of the symmetry axis of the circular arc and the circular arc is origin；
    Choose numerical value in the first penumbra curve it is smaller and change the first shallower penumbra curve, the first selected penumbra The radius of curvature of curve is first curvature radius；
    B. the first degree of crook is determined：
    In the case of same radioactive source, the blade using origin as summit and different the second shaped form end face of degree of crook is obtained The second corresponding penumbra curve in motion, second curve are what radius of curvature became larger from summit along bearing of trend Smooth curve, the radius of curvature of the apex are first curvature radius, the curvature of adjacent two sampled point on second curve The difference of radius is identical；
    Choose numerical value in the second penumbra curve it is smaller and change the second shallower penumbra curve, the second selected penumbra The degree of crook of second curve corresponding to curve is the first degree of crook；
    C. the first summit is determined：
    In the case of same radioactive source, obtain using the first curvature radius as the radius of curvature of apex and there is different top The blade of 3rd shaped form end face of the point threeth penumbra curve corresponding in motion,
    The summit of 3rd curve was arranged in the origin and the reference axis vertical with the symmetry axis of the 3rd curve, The smooth curve that 3rd curve becomes larger for radius of curvature from summit along bearing of trend, and the bending of the 3rd curve Degree is identical with first degree of crook；
    Choose numerical value in the 3rd penumbra curve it is smaller and change the 3rd shallower penumbra curve, the 3rd selected penumbra Summit corresponding to curve is the first summit；
    d：Determine the first curve：
    By the first shaped form end that the radius of curvature with first summit and first apex is first curvature radius Blade of the blade in face as the collimater, first curve are what radius of curvature became larger from summit along bearing of trend Smooth curve, and the degree of crook of first curve is identical with first degree of crook.
  2. 2. the choosing method of collimators vanes as claimed in claim 1, it is characterised in that first curve, the second curve And the 3rd curve be curve for representing even function or the curve for being used to represent even function through translating or rotating Curve after conversion.
  3. 3. the choosing method of collimators vanes as claimed in claim 2, it is characterised in that first curve, the second curve And the 3rd curve be on parabola, hyperbolic cosine curve or ellipse connect short axle two end points camber line.
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CN201710671277.0A CN107362463B (en) 2014-05-28 2014-05-28 Collimator, radiation system and selection method of collimator blades

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