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Method for accelerating electron beam in multistep way and multistep linear accelerator

A linear accelerator and electron beam technology, applied in the direction of linear accelerators, electrical components, accelerators, etc., can solve problems such as inability to cause photonuclear reactions, quantitative analysis of positron emission nuclei, and difficulties in studying biological positions and relative biological doses

Inactive Publication Date: 2012-05-23
BEIJING TOP GRADE HEALTHCARE MEDICAL EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, at present, the nominal acceleration potential of most linear accelerators used in radiotherapy in various medical institutions at home and abroad does not exceed 18MV (megavolts), and the maximum energy of the bremsstrahlung photons emitted by them does not exceed 15MeV, which are all lower than this threshold, so they cannot photonuclear reaction
Even though the nominal accelerating potential of a few high-energy accelerators reaches above 18MV, since the energy of the bremsstrahlung photons emitted by them is mostly lower than the photonuclear reaction threshold, only a very small part of the photons can cause photonuclear reactions. of 15 O, 11 C, 13 Quantitative analysis of positron-emitting nuclei such as N and study of biological location and relative biological dose is difficult, so it is not practical to perform this study on these conventional linacs

Method used

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  • Method for accelerating electron beam in multistep way and multistep linear accelerator
  • Method for accelerating electron beam in multistep way and multistep linear accelerator
  • Method for accelerating electron beam in multistep way and multistep linear accelerator

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Embodiment 1

[0079] Embodiment 1: 6-step acceleration treatment. At this time, the acceleration energy of the linear accelerator is 4 MeV, and the trajectory of the electron beam is an elliptical orbit or a circular orbit. The working process is as follows:

[0080] Step 1. The electron beam generated by the electron gun is deflected by the second injection magnet and enters the linac. The acceleration energy of the linac is 4MeV, and the first step acceleration is carried out, and the energy of the electron beam reaches 4MeV.

[0081] Step 2. The 5MeV electron beam after the first step acceleration first passes through the first quadrupole focusing magnet, the second quadrupole focusing magnet, the first translation magnet, the second translation magnet, and the first axis correction magnet, and then passes through the first The deflection magnet is deflected by about 180 degrees, and then it is corrected and controlled by the first axis correction magnet, the first translation magnet, an...

Embodiment 2

[0084] Embodiment 2, the acceleration energy of the linear accelerator is 5 MeV, and 9 steps of acceleration treatment are performed. The working process is as follows:

[0085] Step 1. The electron beam generated by the electron gun is deflected by the second injection magnet and enters the linear accelerator. The acceleration energy of the linear accelerator is 5 MeV, and the first step acceleration is performed, and the energy of the electron beam reaches 5 MeV.

[0086] Step 2. The 5MeV electron beam after the first step acceleration first passes through the first quadrupole focusing magnet, the second quadrupole focusing magnet, the first translation magnet, the second translation magnet, and the first axis correction magnet, and then passes through the first The deflection magnet is deflected by about 180 degrees, and then corrected and controlled by the first axis correction magnet, the first translation magnet and the second translation magnet, and then accurately ente...

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Abstract

The invention provides a method for accelerating an electron beam in a multistep way and a multistep linear accelerator and belongs to the field of medical science. The method comprises the following steps of: feeding the electron beam into the linear accelerator so as to perform first step accelerating treatment, performing deflection treatment on the electron beam being subjected to the first step accelerating treatment by a first deflection magnet, and performing second step accelerating treatment on the electron beam being subjected to the deflection treatment; performing the deflection treatment on the electron beam being subjected to the second step accelerating treatment by a second deflection magnet, feeding the electron beam being subjected to the deflection treatment into the first deflection magnet so as to perform the deflection treatment, and performing third step accelerating treatment on the electron beam being subjected to the deflection treatment; and repeatedly performing, and extracting the electron beam when the energy of the electron beam being subjected to repeated multistep accelerating treatment reaches an energy threshold. The electron beam meeting various requirements of clinical research can be obtained. The method can be widely applied to the fields, such as radiotherapeutics, nuclear medicine, physics research, and the like.

Description

technical field [0001] The invention belongs to the field of electron beam acceleration processing, and in particular relates to a step-type electron beam acceleration method and a step-type linear accelerator that can be used for tumor radiotherapy and nuclear medicine radiopharmaceutical research and development. Background technique [0002] At present, tumor radiotherapy technology has entered the era of precision, that is, precise irradiation position and precise dose administration. If on this basis, the biological location and biological dose of irradiation can be verified and studied from a biological point of view, that is, from the perspective of biological target volume (biological target volume, BTV) and molecular biology conformal intensity-modulated radiotherapy (biological IMRT, BIMRT) research on tumor radiotherapy will surely bring tumor radiotherapy technology to a new level. When using a heavy ion beam (such as 12 C), when the proton beam and high-energy...

Claims

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Application Information

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IPC IPC(8): H05H9/00
Inventor 张圈世孙启银
Owner BEIJING TOP GRADE HEALTHCARE MEDICAL EQUIP CO LTD