CN1310029A - Shape-adaptive X-ray strengthening method and collimator - Google Patents
Shape-adaptive X-ray strengthening method and collimator Download PDFInfo
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- CN1310029A CN1310029A CN 01105522 CN01105522A CN1310029A CN 1310029 A CN1310029 A CN 1310029A CN 01105522 CN01105522 CN 01105522 CN 01105522 A CN01105522 A CN 01105522A CN 1310029 A CN1310029 A CN 1310029A
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Abstract
The shape-adaptive X-ray strength regulator for medical radiotherapy includes electron beam emitter, X-ray generating tungsten target and collimation mechanism, and features that the tungsten target consists of tungsten target elements arranged in certain rule and the X-ray strength is shape-adaptive regulated by means of the control of the electron beam strength and the scanning trace and the collimation with the collimation mechanism. The present invention also discloses one kind of the collimation mechanism as the implementation.
Description
The present invention relates to a kind of realize method and the collimator apparatus thereof conformal intensity modulated,, the invention still further relates to the collimation mechanism that is used to realize this method in particular for the conformal intensity modulated method of medical radiation treatment X line to the X line.
Radiotherapy is one of main means of oncotherapy at present, has application fields, conformal modulating radiotherapy is the most practical method of science in the radiotherapy now, and want conformal modulating radiotherapy the best way is electron scanning, but the most sophisticated at present electromagnetic deflection scanning technique is difficult in this application, although at first the high energy electron line has certain penetration power to tissue, be mapped to human body deep tissue effect and bad but directly wear, secondly electronics line through its form of a stroke or a combination of strokes wire harness after the propagation of a segment distance throw on the launched field face will be edge dosage low in the middle of dosage high be the hot spot that Gaussian curve distributes, the dosage inequality that has caused the launched field face, obscure boundary, therefore be not suitable for conformal therapy, preferably carry out radiotherapy with the X line, but because the X line is made up of uncharged particle, be difficult to it be carried out deflection control with the electromagnetic deflection mode, the mode on the leafy smooth hurdle of now general employing realizes the conformal therapy to the X line, but still there is more problem in leafy smooth hurdle mode: at first, tens of to leads propelling and pull out and controlled by motor, therefore changing to the speed of another shape from a kind of shape can be very not fast; Secondly all figures can not be pieced together in leafy smooth hurdle, five-pointed star for example, unless at twice or more times finish; The 3rd, it can make intensity modulated therapy, but carries out cumbersome; The 4th, because multi-diaphragm collimator is made up of thin tungsten rod (5 millimeters or thinner), cause card article easily in motor process; The 5th, the given launched field edge of this Duola's chip collimator is step-like, with the true form of tumor be proximate meeting; In addition, it wears that to penetrate penumbra also bigger.
The objective of the invention is for overcome prior art not enough provide a kind of simple in structure, scanning speed fast, can carry out the method for X line conformal modulating radiotherapy and realize the collimation mechanism of this method the tumor of Any shape.
For achieving the above object, the present invention proposes following method: be used to produce the tungsten target of X line by many first tungsten target arrays of arranging by rule of forming of little tungsten target, electron beam is to the little tungsten target bombardment generation X of unit line, the X line that produces after collimator apparatus retaining removes scattered portion, on shadow surface, form and the regular small-sized photograph open country of the corresponding shape of little tungsten target identical permutation, when electron beam scans bombardment according to certain rules to little tungsten target unit, can produce the X line that scans by corresponding rule, by electron beam scanning rule and intensity are controlled, can carry out conformal intensity modulated control to the X line.
After adopting above-mentioned method, the intensity by control beam bombardment little tungsten target unit or the time of staying in little tungsten target unit, the exposure rate of may command X line; Can fit shape control and the medium and small tungsten target of little tungsten target element array unit bombarded selectively or do not bombard, can reach thus the X line is carried out conformal intensity modulated purpose.
In order to realize said method, the invention also discloses a kind of collimation mechanism: collimation mechanism is made up of the collimator that is provided with according to certain rules the collimation through hole of arranging and is fixed on the little tungsten target unit on the through hole, and collimation mechanism can be made up of the collimator that the collimator of above-mentioned band tungsten target unit and multilamellar only are provided with the secondary collimation through hole that identical rule with above-mentioned collimator is listed as.
In order to improve the collimation effect, the making of simplified control system and collimation mechanism, accurate mechanism preferably is provided with relatively-movable main collimator and time collimator, being respectively equipped with the quantity of arranging by matrix on main collimator and time collimator equates, the through hole of position correspondence, the through hole axial direction parallels with directions of rays, through hole cross section on the inferior collimator is less than the cross section of the through hole on the main collimator, main collimator and time collimator are made main collimator through hole porch for transmission material not and are fixed with identical with inlet area little tungsten target unit, and main collimator places between radioactive source and the inferior collimator.
Owing to adopted above-mentioned method and collimation mechanism, electron beam at first bombards and produces the X line being arranged on little tungsten target unit on the main collimator, the intensity of this X line is directly proportional with beam energy, and through on shadow surface, irradiating corresponding X line small-sized photograph open country behind the collimating device collimation; When electron beam scans little tungsten target unit, on shadow surface, can obtain corresponding X line sweep track, therefore according to the profile of tumor by control to electromagnetic deflection voltage, the track while scan and the intensity of control electron beam, and then the track while scan and the intensity that reach control X line satisfy conformal intensity modulated purpose.
The present invention is further elaborated below in conjunction with accompanying drawing, and provide the embodiment of collimation mechanism.
Fig. 1 is a collimation mechanism example structure sketch map of the present invention;
Fig. 2 is that the position between main collimator and the inferior collimator through hole concerns sketch map;
Fig. 3 is the wild face sketch map of (0,1) for coordinate;
Fig. 3-1-Fig. 3-16 is main collimator and the sketch map of time collimator translation in the projection of roentgen radiation x face;
Fig. 4 is collimation mechanism control system theory diagram.
In the present embodiment, it is 12CM that main collimator 1 adopts thickness, the length of side is that the foursquare stereotype of 45CM is made, on stereotype by the matrix square through hole 3 that to be evenly distributed with 400 cross sections be 10mm * 10mm, the distance at center is 20mm between the Kong Yukong, be fixed with little tungsten target unit 5 at its arrival end, area is identical with inlet, inferior collimator 2 is by one and main collimator 1 equal area, thickness is that the stereotype of 8CM is made, above equally by the matrix distribution square through hole 4 that 400 cross sections are arranged is 5mm * 5mm, position relation between through hole 3 and the through hole 4 as shown in Figure 2, when the electron beam of launching from linear accelerator scans the little tungsten target unit 5 on the main collimator 1, will produce the X line in the little tungsten target unit 5 and appear the X line little Fang Ye identical with the square hole area from through hole 3 belows (is 10mm * 10mm), via through holes 4 further collimates on the little Fang Ye arrival of these X lines time collimator 2, what appear from through hole 4 belows will be the little open country of X line of 5mm * 5mm, become 400 so little open countries when arriving the irradiation field face, in order further to illustrate the work process of collimator, we position the square hole on the collimator with rectangular coordinate system earlier, then the square hole coordinate on four angles is respectively (10,10), (9,10), (9,-9), (10,-9) referring to Fig. 2, below we are that the wild face of (0,1) point and periphery institute thereof return regionally to come the scanning work process of this collimator is elaborated with Fig. 3 for example with coordinate.
Fig. 3 partly scans branch to be finished for 16 times, is represented by Fig. 3-1-Fig. 3-16 respectively.In order to describe the work process of collimator, we specially extract a fritter in the coordinate (0,1) in the primary and secondary collimator and the zone of returning with Fig. 3 and represent.Fig. 3 has 16 component Fig. 3-1-Fig. 3-16, these 16 components are divided into I-IV district again, the I district represents that the square hole of main collimator is in home position (upper left corner of region), the II district represent main collimator on the basis in I district to right translation 10mm, the III district be meant main collimator on the basis in II district towards the opposite direction translation of Y-axis arrow (i.e. reach) 10mm.In like manner the IV district then is the 10mm that moves to left on the basis in III district.In fact through just having filled out only according to the emitted X-line Fang Ye of the small square hole of main collimator after such four steps in I-IV district, as if do not need to add time collimator according to having expired whole concentricity wild face.But collimation is problematic like this, the hole pitch-row of at first main collimator is from having only 10mm, therefore the X-ray in a certain square hole just might pass plumbous wall and penetrates and cause to wear greatly and penetrate penumbra from contiguous hole, second by 1 square centimeter little wild as the ultimate unit that constitutes wild face seemed bigger.
The adding of inferior collimator solves these problems effectively, inferior collimator is that unit carries out the right side, preceding, left, back four direction translation with 5mm, the electron beam of an accelerator of the every translation of inferior collimator just scans one time by the hole 400 square holes of main collimator, after the four-wheel, the primary and secondary collimator is together to right translation 10mm (shown in the II district), inferior collimator repeats the translation of the right side, preceding, left, back four direction again, certainly the width of translation is 5mm, and every translation once electron beam is also by hole scanning one time.Be not difficult to draw to make the X-line fill up whole launched field face master collimator to carry out the right side, preceding, left, after four translations (translation is of a size of 10mm), inferior collimator is wanted translation 16 times, electron beam also will be done 16 times scanning.
Generally speaking the concentricity wild face of 40cm * 40cm is made up of the little Fang Ye of 6400 5mm * 5mm (wild unit), and how much or have or not all and realized by the scanning electron line X-line dosage of each wild unit.When accelerator has obtained just can determine whether a certain wild unit will provide electron beam and what provide behind the shape of tumor and the strength information.
As shown in Figure 4, the control system of collimation mechanism is by computer PC dosage control mechanism 6, accelerating tube 2, scanning voltage generation circuit 7, drive circuit 8 and motor A1 are moved in the position, A2, B1 and B2 constitute, computer PC is obtaining tumor information, analyze the back as calculated and launch the beam bombardment tungsten target 5 of respective strengths by customization dosage controlling organization 1 and accelerating tube 2 on the one hand, on the other hand by gated sweep voltage generating circuit 7 control sweep trace of electron beam, and by control position walking circuit 8 control step motors, the X that motor A1 and A2 control main collimator respectively to Y to displacement, motor B1 and B2 control respectively time collimator X to Y to displacement.
Claims (9)
1, a kind ofly realize the method conformal intensity modulated to the X line, comprise the electron beam emission source, be used to produce the tungsten target and the collimation mechanism of X line, it is characterized in that: the tungsten target array that tungsten target is made up of many little tungsten target units (5) of arranging by rule, electron beam produces the X line to little tungsten target unit (5) bombardment, the X line that produces after collimator apparatus retaining removes scattered portion, on shadow surface, form and arrange the regular small-sized photograph open country of corresponding shape with little tungsten target unit (5), when electron beam scans bombardment according to certain rules to little tungsten target unit (5), can produce the X line that scans by corresponding rule, the exposure rate of may command X line; Can fit shape control and the medium and small tungsten target of little tungsten target element array unit bombarded selectively or do not bombard, can reach thus the X line is carried out conformal intensity modulated purpose.
2, the realization according to claim 1 method conformal intensity modulated to the X line is characterized in that: the array that described little tungsten target unit (5) forms is fixedly installed on can be done on the mobile collimator of two dimension.
3, a kind of collimation mechanism of the method that is used to realize that the described X line of claim 1 is conformal intensity modulated is characterized in that: described collimation mechanism is made up of the collimator and the control system that are provided with the collimation through hole of arranging according to certain rules and are fixed on the little tungsten target unit (5) on the through hole.
4, collimation mechanism according to claim 3, it is characterized in that: described collimation mechanism is provided with relatively-movable main collimator (1) and time collimator (2), being respectively equipped with the quantity of arranging by matrix on main collimator (1) and time collimator (2) equates, the collimation through hole (3 of position correspondence, 4), through hole (3,4) axial direction parallels with directions of rays, through hole (4) cross section on the inferior collimator (2) is less than the cross section of the through hole (3) on the main collimator (1), main collimator (1) and time collimator (2) are made for transmission material not, be fixed with the little tungsten target unit (5) identical with inlet area in through hole (3) porch, main collimator (1) places between radioactive source and time collimator (2).
5, collimation mechanism according to claim 4 is characterized in that: the cross section of through hole (3) and through hole (4) is square, and pitch-row equals 2 times of length of sides.
6, according to claim 4 or 5 described collimation mechanism, it is characterized in that: the sectional area of through hole (3) is 4 times of sectional area of through hole (4).
7, according to claim 4 or 5 described collimation mechanism, it is characterized in that: the cross section of through hole (3) is 10mm * 10mm, and the sectional area of through hole (4) is 5mm * 5mm.
8, collimator according to claim 6 is characterized in that: the sectional area of through hole (3) is 10mm * 10mm, and the sectional area of through hole (4) is 5mm * 5mm.
9, collimator control system according to claim 3, it is characterized in that described collimator control system moves drive circuit (8) and motor (A1, A2, B1, B2) by computer (PC), dosage control mechanism (6), scanning voltage generation circuit (7), position, displacement drive circuit (8) output control step motor (A1, A2, B1, B2), motor (A1, A2) control respectively main collimator (1) X to Y to the position, motor (B1, B2) control respectively time collimator (2) X to Y to the position.Computer (PC) output is controlled dosage controlling organization (6), scanning voltage generation circuit (7), position respectively and is moved drive circuit (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011055227A CN1315548C (en) | 2001-02-28 | 2001-02-28 | Shape-adaptive X-ray strengthening method and collimator |
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| CNB011055227A CN1315548C (en) | 2001-02-28 | 2001-02-28 | Shape-adaptive X-ray strengthening method and collimator |
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| CN1310029A true CN1310029A (en) | 2001-08-29 |
| CN1315548C CN1315548C (en) | 2007-05-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008043196A1 (en) * | 2006-09-22 | 2008-04-17 | Qiaosheng Wang | An intensity modulated grating system of compensating disintegration type honeycomb array and using method thereof |
| CN103520843A (en) * | 2013-09-10 | 2014-01-22 | 沈阳东软医疗系统有限公司 | Segment processing method and device for reverse intensity-modulated radiation therapy |
| CN107456663A (en) * | 2017-07-19 | 2017-12-12 | 西安大医数码技术有限公司 | A kind of focus method of X ray, device and radiotherapy apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5663999A (en) * | 1996-06-28 | 1997-09-02 | Systems Medical Systems, Inc. | Optimization of an intensity modulated field |
| US6134294A (en) * | 1998-02-13 | 2000-10-17 | University Of Utah Research Foundation | Device and method for precision macular X-irradiation |
| JP2000271237A (en) * | 1999-03-24 | 2000-10-03 | Mitsubishi Electric Corp | Radiation irradiator |
| JP4374089B2 (en) * | 1999-04-23 | 2009-12-02 | 株式会社日立メディコ | X-ray CT system |
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2001
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008043196A1 (en) * | 2006-09-22 | 2008-04-17 | Qiaosheng Wang | An intensity modulated grating system of compensating disintegration type honeycomb array and using method thereof |
| CN103520843A (en) * | 2013-09-10 | 2014-01-22 | 沈阳东软医疗系统有限公司 | Segment processing method and device for reverse intensity-modulated radiation therapy |
| CN103520843B (en) * | 2013-09-10 | 2016-03-30 | 沈阳东软医疗系统有限公司 | A kind of Ziye processing method of reverse intensity modulated radiation therapy and device |
| CN107456663A (en) * | 2017-07-19 | 2017-12-12 | 西安大医数码技术有限公司 | A kind of focus method of X ray, device and radiotherapy apparatus |
| WO2019015412A1 (en) * | 2017-07-19 | 2019-01-24 | 西安大医数码科技有限公司 | X-ray focusing method and apparatus, and a radiotherapy device |
| US11324969B2 (en) | 2017-07-19 | 2022-05-10 | Our United Corporation | Method and device for focusing X-ray and radiotherapy apparatus |
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