CN103105620B - A kind of photon energy deposition acquisition methods based on the limited form of a stroke or a combination of strokes beam energy deposition core of three-dimensional hybrid - Google Patents
A kind of photon energy deposition acquisition methods based on the limited form of a stroke or a combination of strokes beam energy deposition core of three-dimensional hybrid Download PDFInfo
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Abstract
A kind of photon energy deposition acquisition methods based on the limited form of a stroke or a combination of strokes beam energy deposition core of three-dimensional hybrid, deposit on the basis of acquisition methods in traditional photon energy, formed according to radioactive source and penetrate wild particular case, to penetrate open country, to be divided into some length identical, the unit open country that width is different, call the limited form of a stroke or a combination of strokes beam energy deposition core data of various sizes unit open country, carry out photon energy deposition to obtain, avoid the systematic error that traditional acquisition methods divides the unified square shaped cells open country of size and brings, evaded traditional acquisition methods to be that the precision that guarantee is enough reduces the extra calculating that the wild size of square shaped cells produces consuming time simultaneously.
Description
Technical field
The present invention relates to a kind of photon energy deposition acquisition methods based on the limited form of a stroke or a combination of strokes beam energy deposition core of three-dimensional hybrid, it relates to the field such as nuclear physics, Application of Nuclear Technology.
Background technology
The measurement of quantity of radiant energy deposition is widely used in the fields such as environment protection, radiation chemical engineering, food-processing, Nuclear Technology and Applications, aerospace. Wherein, the speed of energy deposition acquisition methods and precision are the key issues during quantity of radiant energy deposition obtains.
Energy deposition acquisition methods is generally divided into analytic method and Monte Carlo method. Analytic method has fast and in the higher advantage of homogeneous area precision, but there is relatively big error at Nonuniform Domain Simulation of Reservoir; Monte Carlo method all can keep degree of precision in all regions, but due to comparatively consuming time, limits its application.
Form of a stroke or a combination of strokes bundle (FSPB) the energy deposition core that Monte Carlo simulation obtains, it is possible to the secondary charged particle that the interaction that sign beam is divided between the form of a stroke or a combination of strokes bundle of a certain finite size and medium produces, the energy deposition caused in media as well. FSPB model can be used as independent parsing Monte Carlo energy deposition acquisition methods and uses.
Traditional FSPB is when calculating the energy deposition by truly penetrating open country, it may also be useful to by the square division Ziye of same size, divides Ziye like this and can bring systematic error, on determining that precision shines into impact.
Summary of the invention
It is an object of the invention to: overcome traditional F SPB model when calculating radioactive source Irregular field and irradiate, calculate the deficiency in precision, a kind of photon energy deposition acquisition methods based on the limited form of a stroke or a combination of strokes beam energy deposition core of three-dimensional hybrid is provided, better precision can be obtained.
The technical scheme of the present invention is as follows: a kind of photon energy deposition acquisition methods based on the limited form of a stroke or a combination of strokes beam energy deposition core of three-dimensional hybrid, it is characterised in that comprise the following steps:
(1) obtain calculating parameter, comprise following content:
A. the accelerator annex electric multiblade optical grating obtained is measured, in width information and the leakage rate of plane such as the center of grade;
B. utilizing the spectral information of the radioactive source that inverting obtains, coordinate the sub-routine DOSXYZnrc covering card program EGSnrc, the electric multiblade optical grating of acquisition deposits core �� at the three-dimensional form of a stroke or a combination of strokes beam energy that the width of plane such as center of waiting is corresponding;
C. measure the positional information of the radioactive source obtained and penetrate wild information;
D. delineate to emerging ray through accelerator annex electric multiblade optical grating by user, in the shape that plane such as the center of grade is formed;
E. scanning computed tomography, according to CT value, conversion obtains computation model grid unit electron density information;
(2) the photon energy deposition acquisition methods based on the limited form of a stroke or a combination of strokes beam energy deposition core of three-dimensional hybrid is utilized to calculate, the shape formed in plane such as the center of grade according to radioactive source and electric multiblade optical grating are in the width information of plane such as the center of grade, use some length identical, the different form of a stroke or a combination of strokes bundle correlation open country of width divides, then the limited form of a stroke or a combination of strokes beam energy deposition core data of various sizes unit open country are called, carry out photon energy deposition to obtain, avoid the systematic error that traditional acquisition methods divides the unified square shaped cells open country of size and brings, evaded traditional acquisition methods to be that the precision that guarantee is enough reduces the extra calculating that the wild size of square shaped cells produces consuming time simultaneously,
Calculation formula is as follows:
D (r)=��s�� (s) �� (r, s) CF (r) (1)
Wherein �� is projectile flux, obtain by a, c, d of step 1, according to measuring the positional information of radioactive source obtained and penetrate wild information and measure the accelerator annex electric multiblade optical grating that the obtains width information in plane such as the center of grade, correlation open country carries out unit open country and divides, according to delineating the shape formed in plane such as the center of grade to emerging ray through accelerator annex electric multiblade optical grating by user, the projectile flux of each unit open country is given assignment, the part flux that electric multiblade optical grating does not block is 1, and the part flux blocked is grating leakage rate;
�� is precalculated limited pencil beam kernel, obtain by the b of step 1, namely utilize spectral information and the Meng Ka program of inverting, according to the width of electric multiblade optical grating in plane such as the center of grade, simulation in advance obtains the limited form of a stroke or a combination of strokes beam energy deposition core data under this form of a stroke or a combination of strokes bundle size, for subsequent calculations;
CF is inhomogeneity of structure and human body curved surface modifying factor, obtains by the e of step 1, adopts classical Batho modification method and effective Source skin distance method to obtain CF;
Last calculation result is exactly the energy deposition of calculation level.
The spectral information of photon radioactive source adopted in the present invention, by the power spectrum inversion method that developed (Li Gui, Zheng Huaqing, blue ocean, Meng Yao, Song Gang, Wu Yican. based on many algorithms radioactive source inversion method, the patent No.: ZL200910116116.0) obtain.
A core information of photon radioactive source, by the energy deposition kernel method preparation method that developed (Meng Yao, Li Gui, Zheng Huaqing, blue ocean, Song Gang, Wu Yican. the acquisition methods of a kind of energy deposition core, publication number: CN101477202) obtain.
The present invention's advantage compared with prior art is: the present invention can avoid the systematic error that traditional acquisition methods divides the unified square shaped cells open country of size and bring, and evaded traditional acquisition methods to be that the precision that guarantee is enough reduces the extra calculating that the wild size of square shaped cells produces consuming time simultaneously.
Accompanying drawing explanation
Fig. 1 is that the open country of penetrating in the present invention divides schematic diagram;
Fig. 2 is the inventive method flowchart;
Fig. 3 is calculated examples figure of the present invention.
Embodiment
The present invention is implemented as follows:
1. obtain calculating parameter
A) the accelerator annex electric multiblade optical grating obtained is measured, in the width information of plane such as the center of grade;
B) utilizing the spectral information of the radioactive source that inverting obtains, coordinate the sub-routine DOSXYZnrc of Monte-Carlo code EGSnrc, the electric multiblade optical grating of acquisition deposits core �� at the three-dimensional form of a stroke or a combination of strokes beam energy that the width of plane such as center of waiting is corresponding;
C) measure the positional information of the radioactive source obtained and penetrate wild information;
D) delineate to emerging ray through accelerator annex electric multiblade optical grating by user, in the shape that plane such as the center of grade is formed;
E) scanning computed tomography, according to CT value, conversion obtains computation model grid unit electron density information;
As shown in Figure 1, truly penetrating open country according to what accelerator annex was formed, and electric multiblade optical grating is in the width information waiting centerplane, and penetrating open country, to be divided into some length identical, and the different rectangle of width combines, and each rectangle is a form of a stroke or a combination of strokes bundle.
2. obtain accurate photon radioactive source power spectrum, concrete measuring method see developed power spectrum inversion method (Li Gui, Zheng Huaqing, blue ocean, Meng Yao, Song Gang, Wu Yican. based on many algorithms radioactive source inversion method, the patent No.: ZL200910116116.0).
3. obtain energy deposition according to the inversion method in step 2 and obtain the photons spectrum needed, obtain each different form of a stroke or a combination of strokes bundle (effect bundle) to saltation point (x2,y2,z2) energy deposition contribution (as shown in Figure 2), specifically see the energy deposition core developed acquisition methods (Meng Yao, Li Gui, Zheng Huaqing, blue ocean, Song Gang, Wu Yican. the acquisition methods of a kind of energy deposition core. publication number: CN101477202).
As shown in Figure 2, form of a stroke or a combination of strokes bundle and die body surface intersection point (point of application) R can be obtained according to the parameter of form of a stroke or a combination of strokes bundle1(x1,y1,z1) coordinate, it is possible to the condition provided by user obtain act on bundle differential fluence.
Aforesaid operations has obtained the differential fluence information of incident effect bundle, below operates the information by obtaining a core:
According to point of application R1(x1,y1,z1) coordinate and saltation point R2(x2,y2,z2) coordinate, the physical length L of point-to-point transmission can be obtained. Radioactive source initial point is R0(x0,y0,z0), r01And r02Represent R respectively0To R1Distance geometry R0To R2Distance, and primary ray track direction and r01Angle and R1' (R1At R2The subpoint of place X/Y plane) and included angle between R2 line direction and x-axis:
Then saltation point can be obtained at the distance h along primary ray track side upward to point of application and in x and the y value being perpendicular in primary ray track plane by triangle relation:
H=L*cos �� (7)
X=L*sin �� * cos �� (8)
Y=L*sin �� * sin �� (9)
Material information between relative position according to Strahlungseintritt and point of application and 2 calculates inhomogeneity of structure and human body curved surface modifying factor CF (r)
Above-mentioned data are brought into the energy deposition that can calculate current point in formula (1).
4. deposit the Output rusults of the photon energy deposition acquisition methods of core based on the limited form of a stroke or a combination of strokes beam energy of three-dimensional hybrid, comprise following content:
Total space energy deposition distributed intelligence.
5. calculated examples, comprises following content:
Needing to calculate nominal energy is the photon of 6MV, by effect bundle (being perpendicular to die body surface) to energy deposition contribution (as shown in Figure 3) of saltation point (0,20,20):
Geological information (direction be perpendicular to die body surface, by point (0,0 ,-100)) according to effect bundle can obtain the coordinate (0,0,0) of point of application R1, and then tries to achieve radioactive source R0(0,0 ,-100) to the distance r at R1 place01=100cm, obtains R1 place relative differential fluence according to the relative differential fluence of (0,0,0).
Aforesaid operations has obtained differential than the information releasing total energy, below operates the information by obtaining a core:
Coordinate (0 according to point of application R1,0,0) with the coordinate (-20 of saltation point R2,0,20), physical length L=the 28.2cm of point-to-point transmission can be obtained, ��=45 �� and ��=0 ��: substitution formula (7), (8), (9) obtain h=20cm, x=20cm, y=0cm, then by h, x, y and relative differential fluence substitute into formula (1) can obtain this form of a stroke or a combination of strokes bundle to the energy deposition of calculation level, the energy deposition of calculation level is added up by all form of a stroke or a combination of strokes bundles, just obtains this beam to the energy deposition of calculation level.
Note: in this process, the form of a stroke or a combination of strokes bundle of different size is corresponding to different core values.
As shown in Figure 3, ray form of a stroke or a combination of strokes bundle is from radioactive source R0Send, through point of application R1Enter die body and to saltation point R2Sedimentary energy, S0Plane is through point of application R1And with the plane of form of a stroke or a combination of strokes Shu Chuizhi, S1Plane is through saltation point R2And with the plane of form of a stroke or a combination of strokes Shu Chuizhi; Saltation point R2Can be obtained by Fig. 2 with the three-dimensional position relation of form of a stroke or a combination of strokes bundle, its on Z axle on characterize by h with the relation of form of a stroke or a combination of strokes bundle, X, Y-axis are characterized by x, y with the relation of form of a stroke or a combination of strokes bundle.
Calculation formula is as follows:
D (r)=��s�� (s) �� (r, s) CF (r) (1)
Wherein �� is projectile flux, obtain by a, c, d of step 1, according to measuring the positional information of radioactive source obtained and penetrate wild information and measure the accelerator annex electric multiblade optical grating that the obtains width information in plane such as the center of grade, correlation open country carries out unit open country and divides, according to delineating the shape formed in plane such as the center of grade to emerging ray through accelerator annex electric multiblade optical grating by user, the projectile flux of each unit open country is given assignment, the part flux that electric multiblade optical grating does not block is 1, and the part flux blocked is grating leakage rate;
�� is precalculated limited pencil beam kernel, obtain by the b of step 1, namely utilize spectral information and the Meng Ka program of inverting, according to the width of electric multiblade optical grating in plane such as the center of grade, simulation in advance obtains the limited form of a stroke or a combination of strokes beam energy deposition core data under this form of a stroke or a combination of strokes bundle size, for subsequent calculations;
CF is inhomogeneity of structure and human body curved surface modifying factor, obtains by the e of step 1, and the present invention adopts classical Batho modification method and effective Source skin distance method to obtain CF;
Last calculation result is exactly the energy deposition of calculation level.
The content not being described in detail in specification sheets of the present invention belongs to the known prior art of professional and technical personnel in the field.
The above is only the preferred embodiment of the present invention; it is noted that for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. the photon energy deposition acquisition methods based on the limited form of a stroke or a combination of strokes beam energy deposition core of three-dimensional hybrid, it is characterised in that comprise the following steps:
(1) obtain calculating parameter, comprise following content:
A. the accelerator annex electric multiblade optical grating obtained is measured, in width information and the leakage rate of plane such as the center of grade;
B. utilizing the spectral information of the radioactive source that inverting obtains, coordinate the sub-routine DOSXYZnrc covering card program EGSnrc, the electric multiblade optical grating of acquisition deposits core �� at the three-dimensional form of a stroke or a combination of strokes beam energy that the width of plane such as center of waiting is corresponding;
C. measure the positional information of the radioactive source obtained and penetrate wild information;
D. delineate to emerging ray through accelerator annex electric multiblade optical grating by user, in the shape that plane such as the center of grade is formed;
E. scanning computed tomography, according to CT value, conversion obtains computation model grid unit electron density information;
(2) the photon energy deposition acquisition methods based on the limited form of a stroke or a combination of strokes beam energy deposition core of three-dimensional hybrid is utilized to calculate, the shape formed in plane such as the center of grade according to radioactive source and electric multiblade optical grating are in the width information of plane such as the center of grade, use some length identical, the different form of a stroke or a combination of strokes bundle correlation open country of width divides, then the limited form of a stroke or a combination of strokes beam energy deposition core data of various sizes unit open country are called, carry out photon energy deposition to obtain, avoid the systematic error that traditional acquisition methods divides the unified square shaped cells open country of size and brings, evaded traditional acquisition methods to be that the precision that guarantee is enough reduces the extra calculating that the wild size of square shaped cells produces consuming time simultaneously,
Calculation formula is as follows:
D (r)=��s��(s)��(r,s)��CF(r)(1)
Wherein �� is projectile flux, obtain by a, c, d of step 1, according to measuring the positional information of radioactive source obtained and penetrate wild information and measure the accelerator annex electric multiblade optical grating that the obtains width information in plane such as the center of grade, correlation open country carries out unit open country and divides, according to delineating the shape formed in plane such as the center of grade to emerging ray through accelerator annex electric multiblade optical grating by user, the projectile flux of each unit open country is given assignment, the part flux that electric multiblade optical grating does not block is 1, and the part flux blocked is grating leakage rate;
�� is precalculated three-dimensional form of a stroke or a combination of strokes beam energy deposition core, obtain by the b of step 1, namely the spectral information of inverting is utilized, and coordinate the use covering card program, according to the width of electric multiblade optical grating in plane such as the center of grade, simulation in advance obtains the three-dimensional form of a stroke or a combination of strokes beam energy deposition core data under this form of a stroke or a combination of strokes bundle size, for subsequent calculations;
CF is inhomogeneity of structure and human body curved surface modifying factor, and the computation model grid obtained by the e of step 1 unit electron density information, as input parameter, adopts classical Batho modification method and effective Source skin distance method to obtain CF;
Last calculation result is exactly the energy deposition D of calculation level;
Call method in described step (2) is: ray form of a stroke or a combination of strokes bundle is from radioactive source R0Send, through point of application R1Enter die body and to saltation point R2Sedimentary energy, S0Plane is through point of application R1And with the plane of form of a stroke or a combination of strokes Shu Chuizhi, S1Plane is through saltation point R2And with the plane of form of a stroke or a combination of strokes Shu Chuizhi; Saltation point R2Characterize by h with form of a stroke or a combination of strokes bundle relation with form of a stroke or a combination of strokes bundle on Z axle, X, Y-axis are characterized by x, y with the relation of form of a stroke or a combination of strokes bundle.
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| CN104407374B (en) * | 2014-12-10 | 2017-12-22 | 上海联影医疗科技有限公司 | The determination method and device of dosage distribution |
| CN106772546B (en) * | 2016-12-29 | 2018-03-06 | 中科超精（安徽）科技有限公司 | One kind is considered by medium to heteropical charged particle equivalent depth acquisition methods |
| CN107261342A (en) * | 2017-07-12 | 2017-10-20 | 合肥中科离子医学技术装备有限公司 | Proton CT collimator systems |
| CN110652661B (en) * | 2019-09-30 | 2021-03-26 | 中北大学 | Convolution superposition dosage calculation system |
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