CN211584939U - Medical accelerator convenient to dose monitoring - Google Patents
Medical accelerator convenient to dose monitoring Download PDFInfo
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Abstract
The utility model relates to the technical field of medical accelerators, and discloses a medical accelerator convenient for dose monitoring, wherein an accelerating tube, a beam pipeline and a beam needle share a central shaft and are communicated with a straight passage, so that an electron beam is transmitted in the straight passage; the side surface of the beam pipeline is connected with a beam eduction tube, the first electron beam is transmitted in the beam eduction tube, and the periphery of the beam pipeline is provided with a deflection magnetic field generating device which periodically prompts the electron beam to change the transmission direction and output from the beam eduction tube. The utility model discloses a set up beam outlet and magnetic deflection field generating device to "extraction" few partial electron beam carries out the synchronous test and monitors the dose that is used for the electron beam of treatment, does not influence the treatment process, realizes the on-line monitoring dose.
Description
Technical Field
The utility model relates to a medical accelerator technical field, concretely relates to medical accelerator convenient to dose monitoring carries out.
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.
This group has studied a new tumor treatment device and method of use (chinese patent application No. 201810907457.9) in which a trocar is used to pierce into a target tumor volume, then a beam needle enters the trocar, and then an electron accelerator generates high-energy electrons to deliver radiation therapy to the tumor. Since the electron beam spot generated by the electron accelerator is small. The whole course of the electron beam leaving the accelerating tube to reach the tumor is transmitted in a thin tube (the inner diameter is less than 5mm), which is not suitable for the existing dose monitoring method, so that the design and the improvement of the electron accelerator are necessary to facilitate the on-line test of the therapeutic dose of the electron beam in such a small field.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a medical accelerator for small field electron beam, so as to realize on-line monitoring of the dose of the small field electron beam during the treatment process.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a medical accelerator convenient for dose monitoring, which comprises an electron gun control power supply, an electron gun, an accelerating tube, a magnetron, a modulator, a beam pipeline 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, and the front end of the beam pipeline is connected with the beam needle through a corrugated tube; the accelerating tube, the beam pipeline, the corrugated tube and the beam needle share a central shaft, and the four are communicated with a straight-line channel for transmitting electron beams in the straight-line channel; the side surface of the beam pipeline is connected with a beam eduction tube, a first electron beam is transmitted in the beam eduction tube, a deflection magnetic field generating device is arranged on the periphery of the beam pipeline, and the electron beam is periodically prompted to change the transmission direction and is output from the beam eduction tube to form the first electron beam; the electron beam output by the beam needle is a second electron beam.
Preferably, the beam needle and the outlet end of the beam eduction tube are sealed ends.
Preferably, the magnetic field direction of the deflecting magnetic field generating device is perpendicular to the plane formed by the beam current lead-out tube and the beam current pipeline, and when the beam current lead-out tube is located at the right side of the accelerating tube, the magnetic field direction of the deflecting magnetic field is directed from the far end to the near end.
Preferably, the front end of the beam pipeline is provided with a first connecting part, the inlet end of the beam needle is provided with a second connecting part, and the first connecting part and the second connecting part are detachably connected to the corrugated pipe respectively.
The utility model also provides a medical accelerator convenient for dose monitoring, which comprises an electron gun control power supply, an electron gun, an accelerating tube, a magnetron, a modulator, a beam pipeline 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, and the front end of the beam pipeline is connected with the beam needle through a corrugated tube; the accelerating tube, the beam pipeline, the corrugated tube and the beam needle share a central shaft, and the four are communicated with a straight-line channel for transmitting electron beams in the straight-line channel; the side surface of the beam pipeline is connected with a first beam eduction tube and a second beam eduction tube, the first beam eduction tube and the second beam eduction tube are arranged symmetrically to the beam pipeline, a first electron beam is transmitted in the first beam eduction tube, a second electron beam is transmitted in the second beam eduction tube, a deflection magnetic field generating device is arranged on the periphery of the beam pipeline, the electron beam is periodically prompted to change the transmission direction and output from the first beam eduction tube to form the first electron beam, and the electron beam is periodically prompted to change the transmission direction and output from the second beam eduction tube to form the third electron beam; the electron beam output by the beam needle is a second electron beam.
Preferably, the beam needle and the outlet end of the beam eduction tube are sealed ends.
Preferably, the magnetic field direction of the deflecting magnetic field generating device is perpendicular to a plane formed by the first beam extraction pipe and the beam pipeline, when the first electron beam is required to be output from the first beam extraction pipe, the magnetic field direction of the deflecting magnetic field is directed from the far end to the near end, and when the third electron beam is required to be output from the second beam extraction pipe, the magnetic field direction of the deflecting magnetic field is directed from the near end to the far end.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model is provided with a deflecting magnetic field and a beam current leading-out tube, and part of electrons are extracted for realizing the dosage test and monitoring of the electron beam, and the structure is novel;
2. the dose value of the electron beam for treatment is obtained by testing the extracted electrons and processing the electrons by the dose detector, the treatment process is not influenced by the process, the dose can be monitored on line, and the convenience and the accuracy of treatment are improved.
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 block diagram of the basic structure of a medical accelerator that facilitates dose monitoring according to the present application;
FIG. 2 is a schematic diagram of an accelerator tube, a beam needle and a dose detector of a medical accelerator for facilitating dose monitoring according to an embodiment;
FIG. 3 is a schematic diagram illustrating a position of a deflecting magnetic field generating device according to an embodiment;
FIG. 4 is a schematic structural view of a bellows according to an embodiment;
FIG. 5 is a schematic diagram of the placement of dose detectors in determining K-value in one embodiment;
FIG. 6 is a schematic diagram of an accelerator tube, a beam needle and a dose detector in a medical accelerator for facilitating dose monitoring in another embodiment;
FIG. 7 is a schematic diagram of the position of a deflecting magnetic field generating device in another 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 needle, 9-beam eduction tube, 9 a-first beam eduction tube, 9 c-second beam eduction tube, 10-deflecting magnetic field generating device, 11-first electromagnet, 12-second electromagnet, 13-first connecting part, 14-second connecting part, 15-dose detector, 16-dose probe, 17-data processing system, 16 a-first dose probe, 17 a-first data processing system, 16 b-second dose probe, 17 b-second data processing system, 16 c-third dose probe, 17 c-third data processing system, 18-corrugated pipe, 19-elastic channel pipe, 20-flange and 21-bolt.
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 "distal end" refers to the end of the device or apparatus of the present application that is furthest from the reader when the device or apparatus is facing the reader; "proximal" refers to the end of the device or apparatus of the present application that is closest to the reader when the device or apparatus is facing the reader. The term "front end" or "outlet end" refers to the end of the device or apparatus of the present application that is near the tip of the beam or the end from which the beam exits the orifice 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 or the end from which the beam exits the orifice when the device or apparatus is facing the reader.
The utility model provides a medical accelerator convenient for dose monitoring, please refer to fig. 1-3, 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 and a beam needle 8; 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 the beam needle 8; 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, and the front end of the beam pipeline 7 is connected with the beam needle 8 through a corrugated tube 18; the acceleration tube 4, the beam pipeline 7, the corrugated tube 18 and the beam needle 8 share a central axis and are communicated with a straight-line channel, so that electron beams are transmitted in the straight-line channel; the side surface of the beam pipeline 7 is connected with a beam eduction tube 9, a first electron beam is transmitted in the beam eduction tube 9, a deflection magnetic field generating device 10 is arranged on the periphery of the beam pipeline 7, and the electron beam is periodically prompted to change the transmission direction and is output from the beam eduction tube 9 to form the first electron beam; the electron beam output by the beam needle 8 is a second electron beam.
The treatment process of the utility model is as follows: the beam needle 8 is led 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 8, and the electron beams strike the tumor focus part to melt the tumor.
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 8 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 8, 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 8, the periphery of the connection structure of the accelerating tube 4 and the beam current needle 8 is provided with the focusing coil, so that the moving path of the electron beams is effectively guided, and the electron beams are ensured to be focused on the axis of the beam current needle 8.
Because the dosage of electron beam must be monitored in the treatment process, the utility model discloses a beam eduction tube 9 and deflecting magnetic field generating device 10, the few partial electron beam of "extraction" carries out the synchronous test, does not influence the treatment process, can realize the on-line monitoring dosage.
Further, the outlet ends of the beam needle 8 and the beam eduction tube 9 are sealed ends.
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 beam needle 8 and the outlet end of the beam lead-out tube 9 are made of the same material, and the sealed 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.
Further, referring to fig. 3, the magnetic field direction of the deflecting magnetic field generating device 10 is perpendicular to the plane formed by the beam extraction tube 9 and the beam duct 7, and when the beam extraction tube 9 is located at the right of the accelerating tube 4, the magnetic field direction of the deflecting magnetic field is directed from the far end to the near end.
Specifically, the deflecting magnetic field generating device 10 is a pair of electromagnets. The electromagnet has magnetism when being electrified, and the magnetism disappears along with the electrification after the power is off, so that the deflection of the electron beam can be conveniently and rapidly regulated. Preferably, two identical electromagnets are respectively and equidistantly arranged on two sides of the beam needle 8, the first electromagnet 11 is arranged at the far end, and the second electromagnet 12 is arranged at the near end.
By adopting the technical scheme, the transmission direction of the electron beam is changed from being parallel to the central axis of the beam pipeline 7 to being parallel to the central axis of the beam eduction tube 9, so that a first electron beam is formed and used for detecting the dose rate of the electron beam.
Further, the front end of the beam pipeline 7 is provided with a first connecting part 13, the inlet end of the beam needle 8 is provided with a second connecting part 14, and the first connecting part 13 and the second connecting part 14 are detachably connected on the corrugated pipe 18 respectively.
By adopting the technical scheme, the beam pipeline 7 and the beam needle 8 can be disassembled, and because the beam needle 8 is a thin hollow pipe, the outer diameter is generally 1.5-6mm, if the beam needle is damaged due to some reason, the beam needle 8 can be replaced by disassembling.
Further, referring to fig. 4, the bellows 18 includes an elastic passage tube 19, two flanges 20, and at least three sets of bolts 21.
Further, the shape of the elastic passage tube 19 can be adjusted by adjusting the position of the nut in the bolt 21.
In the treatment process, the dosage monitoring method of the utility model comprises the following steps:
s1: the head end of the dosage probe 16 is opposite to the outlet of the beam eduction tube 9 and is positioned on the same central shaft;
s2: the deflecting magnetic field generating device 10 works within the time delta t, so that the transmission direction of the electron beam is changed and the electron beam is output from the beam current extraction pipe 9 to form the first electron beam;
s3: the first electron beam is incident on the first dose probe 16a, and the first dose probe 16a collects a first signal;
s4: after the first dose probe 16a finishes collecting the first signal, the first data processing system 17a processes the first signal to obtain the dose rate H of the first electron beama；
S5: dose H of the first electron beam by the first data processing system 17aaThe data is further processed to obtain the dose H of the second electron beamb。
Wherein the dose rate H of the first electron beam in the step S5aAnd a dose rate H of the second electron beambThere is a linear numerical relationship: hb＝KHa。
FIG. 5 is a schematic diagram of the placement of the dose detector in determining the K value in one embodiment.
K value needs to be determined before treatment, and the K value is determined by the following steps:
p1: the deflecting magnetic field generating device 10 works within the time delta t, so that the transmission direction of the electron beam is changed and the electron beam is output from the beam current extraction pipe 9 to form the first electron beam; the deflecting magnetic field generating device 10 stops working within time n Δ t, and the electron beam is transmitted along the linear channel and output from the beam needle 8 to form the second electron beam, wherein n is a positive integer;
p2: the first electron beam is incident on a first dose probe 16a, and the first dose probe 16a collects a first signal; the second electron beam is emitted to a second dose probe 16b, and the second dose probe 16b collects a second signal;
p3: after the first dose probe 16a finishes collecting the first signal, the first data processing system 17a processes the first signal to obtain the dose rate H1 of the first electron beam1(ii) a After the second dose probe 16b finishes collecting the second signal, the second data processing system 17b processes the second signal to obtain a dose rate H2 of the second electron beam1；
P4: repeating the steps P1-P3 to obtain a series of dose rates H1 (H1) of the first electron beam2,H13,H14,H1i-and the dose rate of said second electron beam H2 (H2)2,H23,H24,H2i，┉)；
P5: dose rate H1 (H1) of the first electron beam1,H12,H13,H14,H1i-and the dose rate of said second electron beam H2 (H2)1,H22,H23,H24,H2i-averaging) to obtain an average dose rate of said first electron beam
And the average dose rate of the second electron beam
A linear numerical relationship is obtained:
the value of K is obtained.
In the pulsed operation mode, the temporal characteristics of the generation of the electron beam have a pulse characteristic, for example, a repetition frequency of 5Hz, 5 current pulses are generated within 1s, a pulse repetition period of 200ms, and a pulse width of 1 to 4 us.
Referring to fig. 2, the dose detector 15 of the present invention includes a dose probe 16 and a data processing system 17, wherein the data processing system 17 processes the signal monitored by the dose probe 16 to obtain the dose of the electron beam; the head end of the dosage probe 16 is opposite to the outlet of the beam outlet pipe 9 and is positioned on the same central axis.
In particular, the dose probe 16 of the dose detector 15 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 outlet of the beam eduction tube 9 and directly obtain the dose of the first electron beam; similarly, the UNIDOS E dosimeter can monitor signals at the outlet of the beam needle 8 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.
When the accelerator performs radiotherapy, ionizing radiation exists, which affects the health of doctors and technicians, in the embodiment, the dose probe 16 and the data processing system 17 perform data transmission in a wireless mode or a wired mode. The doctor or technician can measure and monitor the dosage on line through remote operation.
Specifically, the wireless mode is one of WIFI, cellular network, microwave communication, and bluetooth.
Specifically, the wired mode is one of optical fiber transmission, twisted pair transmission, coaxial cable transmission, and broadband common cable transmission.
The utility model discloses a beam outlet 9 and deflecting magnetic field generating device 10, the few partial electron beam of "extraction" carries out the synchronous test, does not influence the treatment process, can realize the on-line monitoring dosage.
In order to reduce the error of the dose test result, the distance between the first dose probe 16a and the outlet end of the beam outlet pipe 9 and the distance between the second dose probe 16b and the outlet end of the beam needle 8 are equal and are kept constant.
Example 1
Before treatment, the procedure was followed as described above in steps P1-P5, Δ t 1s, and the test data obtained are shown in table 1.
TABLE 1 test results tables for H1 and H2 (units Gy/min)
By processing the test results of H1 and H2, K is determined to be 4.
Example 2
During the treatment, the dose monitoring is performed according to steps S1-S4, Δ t ═ 1S, n ═ 5, and the dose rate H of the first electron beamaThe test value and the dose rate H of the second electron beambThe calculated values are shown in Table 2.
TABLE 2 test results tables for H1 and H2 (units Gy/min)
| Number of tests | HaTest value | HbCalculated value | Number of tests | HaTest value | HbCalculated value |
| 1 | 16.26 | 65.05 | 14 | 16.26 | 65.03 |
| 2 | 16.75 | 66.99 | 15 | 16.47 | 65.89 |
| 3 | 16.56 | 66.22 | 16 | 16.52 | 66.06 |
| 4 | 15.95 | 63.79 | 17 | 16.74 | 66.96 |
| 5 | 16.54 | 66.17 | 18 | 16.30 | 65.18 |
| 6 | 16.77 | 67.07 | 19 | 16.03 | 64.10 |
| 7 | 16.39 | 65.56 | 20 | 16.29 | 65.16 |
| 8 | 16.86 | 67.45 | 21 | 16.55 | 66.19 |
| 9 | 16.65 | 66.58 | 22 | 16.26 | 65.02 |
| 10 | 16.82 | 67.27 | 23 | 16.03 | 64.10 |
| 11 | 16.25 | 64.98 | 24 | 16.27 | 65.08 |
| 12 | 16.13 | 64.52 | 25 | 16.25 | 64.98 |
| 13 | 16.81 | 67.22 |
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.
For the sake of safety, to avoid the dose detector 15 from malfunctioning, in another technical solution, two sets of the dose detector 15 and two sets of the beam extraction tubes 9 are provided, and the dose rates obtained by the two sets of the dose detector 15 are both set, wherein one set of the dose detector 15 is malfunctioning, the other set is capable of continuing to operate, and in addition, the two sets of dose rate data are also capable of being compared to examine the stability of the data.
In another embodiment, referring to fig. 6-7, a medical accelerator for facilitating dose monitoring includes an electron gun control power supply 2, an electron gun 3, an accelerating tube 4, a magnetron 5, a modulator 6, a beam conduit 7, and a beam needle 8; 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 the beam needle 8; 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, and the front end of the beam pipeline 7 is connected with the beam needle 8 through a corrugated tube 18; the acceleration tube 4, the beam pipeline 7, the corrugated tube 18 and the beam needle 8 share a central axis and are communicated with a straight-line channel, so that electron beams are transmitted in the straight-line channel; the side surface of the beam pipeline 7 is connected with a first beam extraction pipe 9a and a second beam extraction pipe 9b, the first beam extraction pipe 9a and the second beam extraction pipe 9b are arranged symmetrically to the beam pipeline 7, a first electron beam is transmitted in the first beam extraction pipe 9a, a third electron beam is transmitted in the second beam extraction pipe 9b, a deflection magnetic field generating device 10 is arranged on the periphery of the beam pipeline 7, the electron beams are periodically prompted to change the transmission direction and are output from the first beam extraction pipe 9a to form the first electron beam, and the electron beams are periodically prompted to change the transmission direction and are output from the second beam extraction pipe 9b to form the third electron beam; the electron beam output by the beam needle 8 is a second electron beam.
Further, the magnetic field direction of the deflecting magnetic field generating device 10 is perpendicular to the plane formed by the first beam outgoing tube 9a and the beam conduit 7, when the first electron beam is required to be output from the first beam outgoing tube 9a, the magnetic field direction of the deflecting magnetic field is directed from the far end to the near end, and when the third electron beam is required to be output from the second beam outgoing tube 9b, the magnetic field direction of the deflecting magnetic field is directed from the near end to the far end.
Specifically, the magnetic field direction of the deflecting magnetic field is changed by changing the current direction of the spiral line.
The utility model discloses a beam outlet 9 and deflecting magnetic field generating device 10, the few partial electron beam of "extraction" carries out the synchronous test, only needs to mark before the treatment, 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 (7)
1. A medical accelerator convenient for dose monitoring is characterized by comprising an electron gun control power supply, an electron gun, an accelerating tube, a magnetron, a modulator, a beam pipeline 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, and the front end of the beam pipeline is connected with the beam needle through a corrugated tube; the accelerating tube, the beam pipeline, the corrugated tube and the beam needle share a central shaft, and the four are communicated with a straight-line channel for transmitting electron beams in the straight-line channel; the side surface of the beam pipeline is connected with a beam eduction tube, a first electron beam is transmitted in the beam eduction tube, a deflection magnetic field generating device is arranged on the periphery of the beam pipeline, and the electron beam is periodically prompted to change the transmission direction and is output from the beam eduction tube to form the first electron beam; the electron beam output by the beam needle is a second electron beam.
2. The medical accelerator for facilitating dose monitoring of claim 1, wherein the beam needle and the exit end of the beam exit tube are sealed ends.
3. The medical accelerator for facilitating dose monitoring according to claim 1, wherein the magnetic field direction of the magnetic deflection field generating device is perpendicular to the plane formed by the beam exit tube and the beam conduit, and the direction of the magnetic deflection field is from the distal end to the proximal end when the beam exit tube is located at the right of the accelerator tube.
4. The medical accelerator convenient for dose monitoring according to claim 1, wherein a first connecting portion is disposed at the front end of the beam conduit, a second connecting portion is disposed at the inlet end of the beam needle, and the first connecting portion and the second connecting portion are detachably connected to the bellows respectively.
5. A medical accelerator convenient for dose monitoring is characterized by comprising an electron gun control power supply, an electron gun, an accelerating tube, a magnetron, a modulator, a beam pipeline 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, and the front end of the beam pipeline is connected with the beam needle through a corrugated tube; the accelerating tube, the beam pipeline, the corrugated tube and the beam needle share a central shaft, and the four are communicated with a straight-line channel for transmitting electron beams in the straight-line channel; the side surface of the beam pipeline is connected with a first beam extraction pipe and a second beam extraction pipe, the first beam extraction pipe and the second beam extraction pipe are arranged symmetrically to the beam pipeline, a first electron beam is transmitted in the first beam extraction pipe, a third electron beam is transmitted in the second beam extraction pipe, a deflection magnetic field generating device is arranged on the periphery of the beam pipeline, the electron beam is periodically prompted to change the transmission direction and output from the first beam extraction pipe to form the first electron beam, and the electron beam is periodically prompted to change the transmission direction and output from the second beam extraction pipe to form the third electron beam; the electron beam output by the beam needle is a second electron beam.
6. The medical accelerator for facilitating dose monitoring of claim 5, wherein the beam needle and the exit end of the beam exit tube are sealed ends.
7. The medical accelerator for facilitating dose monitoring of claim 5, wherein the magnetic field direction of the magnetic deflection field generating device is perpendicular to the plane formed by the first beam exit tube and the beam conduit, and the magnetic field direction of the magnetic deflection field is from the distal end to the proximal end when the first electron beam is required to be output from the first beam exit tube, and the magnetic field direction of the magnetic deflection field is from the proximal end to the distal end when the third electron beam is required to be output from the second beam exit tube.
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| CN201922081568.1U CN211584939U (en) | 2019-11-27 | 2019-11-27 | Medical accelerator convenient to dose monitoring |
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| CN201922081568.1U CN211584939U (en) | 2019-11-27 | 2019-11-27 | Medical accelerator convenient to dose monitoring |
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Effective date of registration: 20231124 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. |