CN211675929U - Small-field medical accelerator capable of monitoring dosage on line - Google Patents
Small-field medical accelerator capable of monitoring dosage on line Download PDFInfo
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- CN211675929U CN211675929U CN201922080579.8U CN201922080579U CN211675929U CN 211675929 U CN211675929 U CN 211675929U CN 201922080579 U CN201922080579 U CN 201922080579U CN 211675929 U CN211675929 U CN 211675929U
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- 238000010894 electron beam technology Methods 0.000 claims abstract description 64
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
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- 229910052719 titanium Inorganic materials 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
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Abstract
The utility model relates to the technical field of medical accelerators, and discloses a small-field medical accelerator capable of monitoring dosage on line, which comprises an accelerating tube, a beam pipeline, a beam scraper, a corrugated tube and a beam needle, wherein the beam pipeline, the beam scraper, the corrugated tube and the beam needle are sequentially detachably connected, and are concentric with one another and communicated with a straight line channel, so that electron beams are transmitted in the straight line channel; the inner aperture of the beam scraper is smaller than that of the beam pipeline. The utility model realizes the separation of the electron beam through the beam scraper, is convenient for the on-line monitoring of the dosage during the treatment and has novel structure; the path of the electron beam is adjusted through the corrugated pipe, so that the deviation and waste of the electron beam are reduced; the dosage monitoring process does not influence the treatment process, and the on-line dosage monitoring can be realized.
Description
Technical Field
The utility model relates to a medical accelerator technical field, concretely relates to ability on-line monitoring dosage's medical accelerator in small open country.
Background
According to the requirements of the national standard GB9706.5-2008, a dose monitoring system must be included in the medical electronic linear accelerator. The dose monitoring system used by the traditional medical accelerator consists of an ionization chamber detector and an auxiliary circuit thereof. The ionization chamber is positioned in the radiation system, is arranged between the homogenizing filter or the scattering foil and the secondary collimator of the photon line, and consists of a plurality of pole pieces, wherein two pairs of pole pieces are used for monitoring the homogenization degree of two mutually vertical directions in the radiation field, one pole piece is used for monitoring the energy change of radiation, and the other two pole pieces are used for detecting the absorption dose of the radiation. The dose monitoring system of the traditional medical accelerator mostly uses a flat ionization chamber, the size of the flat ionization chamber is required to cover the whole treatment radiation field, and the number of the flat ionization chambers is limited. The function of the dose monitoring system is to monitor the X-ray, the dose rate of the electron beam, the integrated dose and the symmetry and flatness of the field.
The utility model discloses a medical accelerator directly utilizes electron beam treatment tumour, and the electron beam leaves the whole transmission in a tubule (the internal diameter is less than 5mm) that accelerating tube reachs the tumour, can not directly pass the ionization chamber, consequently the ionization chamber is not applicable to this kind of equipment, does not have the treatment dosage of the so little wild electron beam of relevant dosage monitoring method on-line test at present both home and abroad yet. Therefore, in order to monitor the dose, it is necessary to find a dose monitoring system suitable for such a medical accelerator or to modify such a medical accelerator to fit existing dose monitoring systems.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a medical accelerator for small field electron beam, which is convenient for on-line monitoring dosage of the medical accelerator during the treatment process.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a small field accelerator capable of monitoring dosage on line, which comprises an electron gun control power supply, an electron gun, an accelerating tube, a magnetron, a modulator, a beam pipeline, a beam scraper, a corrugated tube and a beam needle; the electron gun control power supply is used for controlling the electron gun injection voltage; the electron gun is used for outputting electron beams, and the accelerating tube is used for accelerating the electron beams output by the electron gun and then outputting the electron beams through a beam needle; the modulator is used for controlling the magnetron; the magnetron is connected with the accelerating tube through a waveguide chain; the rear end of the beam pipeline is fixedly connected to the center of the front end of the accelerating tube; the beam flow pipeline, the beam scraper, the corrugated pipe and the beam flow needle are sequentially detachably connected, share a central shaft and are communicated with a straight line channel, so that an electron beam is transmitted in the straight line channel; the inner aperture of the beam scraper is smaller than that of the beam pipeline.
Preferably, the beam scraper is a cylinder with a central hole.
Preferably, the material of the beam scraper is lead.
Preferably, the interior of the cylinder contains an inner circular ring.
Preferably, the material of the inner circular ring is solid water or graphite.
Preferably, the bellows comprises a resilient passage tube, two flanges and at least three sets of bolts.
Preferably, the shape of the elastic passage tube can be adjusted by adjusting the position of a nut in the bolt.
Preferably, the outlet end of the beam current needle is a sealed end.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model realizes the separation of the electron beam through the beam scraper, is convenient for the on-line monitoring of the dosage during the treatment and has novel structure; the path of the electron beam is adjusted through the corrugated pipe, so that the deflection and waste of the electron beam are reduced.
2. The utility model discloses a first electron beam striking beam scraping device produces X ray, carries out the synchronous test to X ray, handles through the dose monitoring system, obtains the dose value of second electron beam, and the treatment process is not influenced in this process, can on-line monitoring dose, improves the convenience and the accuracy of treatment;
3. the utility model discloses can adopt two dose monitoring system, under one of them dose monitoring system breaks down, ensure that dose monitoring system is effective, improve patient's security.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a basic structural block diagram of a medical accelerator according to the present application;
FIG. 2 is a schematic diagram of an embodiment of an accelerator tube, a beam needle and a dose monitoring system of a medical accelerator;
FIG. 3 is a cross-sectional view of a beam scraper in one embodiment;
FIG. 4 is a cross-sectional view of a beam scraper in another embodiment;
FIG. 5 is a schematic structural view of a bellows according to an embodiment;
FIG. 6 is a schematic structural diagram of an accelerating tube, a beam current needle and a dose monitoring system in a medical accelerator according to another embodiment;
FIG. 7 is a schematic diagram of the placement of the dose detection system in determining the value of K in one embodiment;
reference numerals: 1-medical accelerator, 2-electron gun control power supply, 3-electron gun, 4-accelerating tube, 5-magnetron, 6-modulator, 7-beam pipeline, 8-beam scraper, 801-central hole, 9-corrugated tube, 10-beam needle, 11-elastic channel tube, 12-flange, 13-bolt, 14-dose probe, 15-data processing system, 14 a-first dose probe, 15 a-first data processing system, 14 b-second dose probe, 15 b-second data processing system, 14 c-third dose probe, 15 c-third data processing system and 16-dose detector.
Detailed Description
For further understanding of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described, and obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of the present invention based on the embodiments of the present invention.
It should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features. The term "front end" or "exit end" refers to the end of the device or apparatus of the present application that is near the tip of the beam when the device or apparatus is facing the reader; "rear end" or "inlet end" refers to the end of the device or apparatus of the present application that is distal from the tip of the beam when the device or apparatus is facing the reader.
The utility model provides a small field accelerator 1 capable of monitoring dosage on line, please refer to fig. 1-2, which comprises an electron gun control power supply 2, an electron gun 3, an accelerating tube 4, a magnetron 5, a modulator 6, a beam pipeline 7, a beam scraper 8, a corrugated pipe 9 and a beam needle; the electron gun control power supply 2 is used for controlling the injection voltage of the electron gun 3; the electron gun 3 is used for outputting electron beams, and the accelerating tube 4 is used for accelerating the electron beams output by the electron gun 3 and then outputting the electron beams through a beam needle; the modulator 6 is used for controlling the magnetron 5; the magnetron 5 is connected with the accelerating tube 4 through a waveguide chain; the rear end of the beam pipeline 7 is fixedly connected to the center of the front end of the accelerating tube 4; the beam flow pipeline 7, the beam scraper 8, the corrugated pipe 9 and the beam flow needle are sequentially detachably connected, share a central shaft and are communicated with a straight line channel, so that electron beams are transmitted in the straight line channel; the inner aperture of the beam scraper 8 is smaller than that of the beam pipeline 7.
The treatment process of the utility model is as follows: the beam needle 10 is introduced into a tumor focus part in a human body through a trocar (not shown) preset on the human body, the electron gun 3 generates electron beams, the electron beams are accelerated through the accelerating tube 4 and are finally output through the beam needle 10, and the electron beams strike the tumor focus part to ablate tumors.
The treatment process of the utility model can also be as follows: the tumor focus part is exposed through modes such as operation, the beam needle 10 is introduced into the tumor focus part in a human body, the electron gun 3 generates electron beams, the electron beams are accelerated through the accelerating tube 4 and are finally output through the beam needle 10, and the electron beams strike the tumor focus part to melt the tumor.
The waveguide chain of the embodiment is a flexible waveguide, the flexible waveguide has good flexibility, can bear bending, stretching and compression to a certain degree, and ensures the transmission of electron beams under the condition that the accelerating tube 4 and the magnetron 5 are separately arranged.
In order to enable the electron beams to be smoothly transmitted from the beam current needle 10, a focusing coil is arranged on the periphery of the connection structure of the accelerating tube 4 and the beam current needle 10, so that the moving path of the electron beams can be effectively guided, and the electron beams are guaranteed to be gathered on the axis of the beam current needle 10.
Further, referring to fig. 3-4, the beam scraper 8 is a cylinder with a central hole 801.
Further, the material of the beam scraping device 8 is lead.
Further, referring to fig. 4, the cylinder includes an inner ring therein.
Further, the inner ring is made of solid water or graphite.
X-ray generation principle: the bremsstrahlung of electrons bombards metal in vacuum by high-energy electrons, the electrons interact with the coulomb field of atomic nucleus when approaching the atomic nucleus, the moving direction of the electrons is deflected and sharply decelerated, and the energy is converted into a radiation form to generate X rays.
Because the dosage to the electron beam must be monitored at the treatment process, the utility model discloses a partial electron beam striking scrapes a ware 8, produces X ray, carries out the synchronous test to X ray, does not influence the treatment process, can realize the on-line monitoring dosage.
Further, referring to fig. 5, the corrugated tube 9 includes an elastic passage tube 11, two flanges 12 and at least three sets of bolts 13.
Further, the shape of the elastic passage tube 11 can be adjusted by adjusting the position of the nut in the bolt 13. For example, by shortening the distance between the nut and the bolt head in a certain position, a displacement of the resilient passage tube 11 towards this position can be achieved.
Further, the outlet end of the beam current needle 10 is a sealed end.
By adopting the technical scheme, the internal environment of the whole accelerator is kept in a vacuum environment, and the electrons realize vacuum low-loss transmission.
In this embodiment, the sealing end is a nonmagnetic metal sheet, preferably a titanium sheet or a beryllium sheet. The thickness of the sealed end is below 200 μm. Long-term experiments and research summarization show that the sealing end is too thick, electrons cannot pass through the sealing end, when a titanium sheet or a beryllium sheet is used as the sealing material, the passing condition of the electrons is better, the attenuation degree of the electrons is lower, and at the moment, the effective passing rate of the electrons and the sealing of the space in the tube can be ensured.
The utility model adopts a dose detector to test the dose, please refer to fig. 2, the dose detector 16 comprises a dose probe 14 and a data processing system 15, the head end of the first dose probe 14a is opposite to the side surface of the beam scraping device 8 and is positioned on the same central shaft; the first data processing system 15b processes the signals monitored by the first dose probe 14a to derive the dose of the second electron beam.
In particular, the dose detector 16 of the present embodiment comprises a finger ionization chamber, preferably a UNIDOS E dosimeter manufactured by PTW, Germany. The UNIDOS E dosimeter can monitor signals at the beam scraper 8 and directly obtain the dosage of X rays; similarly, the UNIDOS E dosimeter can monitor the signal at the outlet of the beam needle 10 and directly obtain the dose of the second electron beam.
Principle of finger ionization chamber measuring absorbed dose: the ionization charge generated by ionizing radiation is first measured and then calculated and converted into the energy deposited by ionizing radiation, i.e. the absorbed dose, using the average ionization energy of air.
Principle of measuring absorbed dose: when X-ray passes through the ionization chamber, gas molecules in the cavity of the ionization chamber are ionized to generate positive ions and electrons, and weak current signals are generated under the action of an electric field (10)-8A) Its magnitude is proportional to the intensity of the X-rays. The signal is sent to a preamplifier to be processed, so that the intensity of the X-ray, namely the dosage rate can be measured, the work is reliable, and the data detection is accurate.
The utility model discloses a first electron beam striking scrapes a bundle ware 8, produces X ray, carries out the synchronous test to X ray, does not influence the treatment process, can realize the on-line monitoring dosage.
For safety reasons, to avoid the dose detector 16 from malfunctioning, in another embodiment, two sets of dose detectors 16 are provided, and both sets of dose detectors 16 can obtain dose rates, wherein one set of dose detectors 16 is malfunctioning, the other set can continue to operate, and the two sets of dose rate data can be compared to examine the stability of the data.
Referring to fig. 6, the first group of dose detectors 16 includes a first dose probe 14a and a first data processing system 15a, the second group of dose detectors 16 includes a second dose probe 14b and a second data processing system 15b, the first dose probe 14a performs data transmission with the first data processing system 15a, and the second dose probe 14b performs data transmission with the second data processing system 15 b.
The utility model discloses a dose monitoring method, including following step:
s1: the first electron beam strikes the beam scraper 8 to generate X-rays, and a first dose probe collects signals of the X-rays;
s2: after the first dose probe collects the signals, the first data processing system processes the signals to obtain the dose rate H of the X-raysa；
S3: dose H of X-rays by the first data processing systemaThe data is further processed to obtain the dose H of the second electron beam passing through the beam needleb。
Wherein, step S3Dose rate H of the second electron beam in stepbWith the dose rate H of the X-raysaThere is a linear numerical relationship: hb＝KHa。
The dose monitoring method is used for indirectly obtaining the dose of the second electron beam for treatment by monitoring the dose of the first electron beam during the treatment.
FIG. 7 is a schematic diagram of the placement of the dose detection system in determining the value of K in one embodiment.
Wherein the K value is determined by the following steps:
p1: the first electron beam strikes the beam scraper 8 to generate X-rays, and a first dose probe 14a collects signals of the X-rays; a second electron beam passes through the beam needle, and a third dose probe 14c collects signals of the second electron beam;
p2: after the first dose probe 14a finishes collecting the X-ray signal, the first data processing system 15a processes the X-ray signal to obtain a dose rate H1 of the X-ray1(ii) a After the third dose probe 14c finishes collecting the signal of the second electron beam, the third data processing system 15c processes the signal of the second electron beam to obtain the dose rate H2 of the second electron beam1；
P3: repeating the steps P1-P2 to obtain a series of dosage rates H1 (H1) of the X-rays2,H13,H14,H1i-and the dose rate of said second electron beam H2 (H2)2,H23,H24,H2i，┉)；
P4: the dose rate of the X-ray is H1 (H1)1,H12,H13,H14,H1i-and the dose rate of said second electron beam H2 (H2)1,H22,H23,H24,H2i-) averaging to obtain the average dose rate of said X-rays
And the average dose rate of the second electron beam
A linear numerical relationship is obtained:
the value of K is obtained.
The determination of the K-value corresponds to establishing a mathematical relationship between the dose rate of the X-rays and the dose rate of the second electron beam, which needs to be performed before the treatment.
In order to reduce the error of the dose test result, the distance between the first dose probe 14a and the outlet end of the side surface of the beam scraper 8, the distance between the second dose probe 14b and the outlet end of the side surface of the beam scraper 8, and the distance between the third dose probe 14c and the outlet end of the beam needle 10 are equal and are kept constant.
The utility model discloses a first electron beam striking scrapes a bundle ware 8, produces X ray, carries out the synchronous test to X ray, obtains the dose rate of beam needle exit end second electron beam, does not influence the treatment process, can realize the dose of on-line monitoring second electron beam (be used for the treatment).
Example 1
Prior to treatment, the procedure was followed as described above in steps P1-P4, and the test data are shown in Table 1.
TABLE 1 test results Table for H1 and H2 before treatment (units Gy/s)
By processing the test results of H1 and H2, K is 79.426.
Example 2
During the treatment, the dosage is monitored according to the steps S1-S3, and the dosage rate H of the X-rayaThe test value and the dose rate H of the second electron beambThe calculated values are shown in Table 2.
TABLE 2 test results Table for H1 and H2 during treatment (units Gy/s)
In this embodiment, the dose rate of the second electron beam (for treatment) is calculated by monitoring the dose rate of the first electron beam, and the dose rate is monitored without affecting the treatment.
The utility model discloses a first electron beam striking scrapes a ware 8, produces X ray, carries out the synchronous test to X ray, only needs to mark before the treatment, just can test the dose rate of the second electron beam of line needle exit end, the utility model discloses a measuring dose's step is simple and convenient, does not influence the treatment process, realizes the on-line monitoring dosage.
The embodiments shall be considered as exemplary and not restrictive for the person skilled in the art, and any combination of the features of the above-described embodiments may be made, and for the sake of brevity of description, all possible combinations of the features of the above-described embodiments are not described, however, as long as there is no contradiction between these combinations of features, the scope of the present description shall be considered as being described in the present specification, and therefore all variations falling within the meaning and scope of the equivalent elements of the claims shall be intended to be embraced by the present invention.
Claims (8)
1. A small field medical accelerator capable of monitoring dosage on line is characterized by comprising an electron gun control power supply, an electron gun, an accelerating tube, a magnetron, a modulator, a beam pipeline, a beam scraper, a corrugated tube and a beam needle; the electron gun control power supply is used for controlling the electron gun injection voltage; the electron gun is used for outputting electron beams, and the accelerating tube is used for accelerating the electron beams output by the electron gun and then outputting the electron beams through a beam needle; the modulator is used for controlling the magnetron; the magnetron is connected with the accelerating tube through a waveguide chain; the rear end of the beam pipeline is fixedly connected to the center of the front end of the accelerating tube; the beam flow pipeline, the beam scraper, the corrugated pipe and the beam flow needle are sequentially detachably connected, share a central shaft and are communicated with a straight line channel, so that an electron beam is transmitted in the straight line channel; the inner aperture of the beam scraper is smaller than that of the beam pipeline.
2. The accelerator according to claim 1, wherein the beam scraper is a cylinder with a central hole.
3. The accelerator according to claim 2, wherein the beam scraper is made of lead.
4. The accelerator according to claim 2, wherein the cylinder comprises an inner circular ring inside.
5. The accelerator according to claim 4, wherein the inner ring is made of solid water or graphite.
6. The accelerator according to claim 1, wherein the bellows comprises an elastic channel tube, two flanges and at least three sets of bolts.
7. The accelerator according to claim 6, wherein the shape of the elastic channel tube can be adjusted by adjusting the position of the nut in the bolt.
8. The accelerator capable of monitoring dosage online for small biomedical applications according to claim 1, wherein the outlet end of the beam needle is a sealed end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922080579.8U CN211675929U (en) | 2019-11-27 | 2019-11-27 | Small-field medical accelerator capable of monitoring dosage on line |
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| CN201922080579.8U CN211675929U (en) | 2019-11-27 | 2019-11-27 | Small-field medical accelerator capable of monitoring dosage on line |
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| CN211675929U true CN211675929U (en) | 2020-10-16 |
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Effective date of registration: 20231123 Address after: 523000 Building 1, No.1 Xuefu Road, Songshanhu Park, Dongguan City, Guangdong Province Patentee after: Guangdong Qingda Innovation Research Institute Co.,Ltd. Patentee after: SHENZHEN MINGJIE MEDICAL TECHNOLOGY Co.,Ltd. Address before: Building G1, University Innovation City, No.1 Xuefu Road, Songshanhu Park, Dongguan City, Guangdong Province, 523808 Patentee before: TSINGHUA INNOVATION CENTER IN DONGGUAN Patentee before: SHENZHEN MINGJIE MEDICAL TECHNOLOGY Co.,Ltd. |
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