Multi-layer Faraday cup measurement system and method for carbon ion beam measurement

A technology of Faraday cylinder and measuring system, which is applied in the field of carbon ion therapy system range measurement and radiation therapy, can solve the problems of large number of electronic channels, large size of multi-layer ionization chamber, inconvenient use, etc., and achieves simplification and insulation of the measuring system. The effect of tightness and small space size between layers and metal layers

Pending Publication Date: 2022-06-24
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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Problems solved by technology

However, the multi-layer ionization chamber is large in size, heavy in weight, has a large number of electronic channels, and contains high-voltage modules, so it is still inconvenient to use clinically.

Method used

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  • Multi-layer Faraday cup measurement system and method for carbon ion beam measurement
  • Multi-layer Faraday cup measurement system and method for carbon ion beam measurement
  • Multi-layer Faraday cup measurement system and method for carbon ion beam measurement

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Embodiment 1

[0037] This embodiment discloses a multi-layer Faraday cylinder measurement system for carbon ion beam measurement. In this embodiment, the energy of the carbon ion beam is 80-430 MeV / u. like figure 1 and figure 2 As shown, the measurement system includes: a housing 1, several groups of measurement layers 2, a slot 3 and a multi-channel galvanometer 4; the measurement layer 2 is arranged in the housing 1, which includes a metal layer 21 and an insulating layer 22, and the metal layer 21 is arranged On the insulating layer 22, the measurement plane of the metal layer 21 is perpendicular to the incident direction of the carbon ion beam. Each group of measurement layers 2 is stacked and arranged, and the insulating layer 22 is used to insulate two adjacent metal layers 21 from each other; the slot 3 is arranged on the housing 1 and is connected to the metal layers 21 in each group of measurement layers 2 for The charge signal obtained by the metal layer 21 is transmitted to th...

Embodiment 2

[0045] Based on the same inventive concept, since the measurement range of 80-430 MeV / u cannot be satisfied based on only one energy reducing plate 7, in order to solve this problem, this embodiment provides a multi-layer Faraday cylinder measurement method for carbon ion beam measurement , including: the multi-layer Faraday cylinder measurement system in Embodiment 1;

[0046] S1 determines the thickness of the energy reducing sheet, and sets the corresponding thickness of the energy reducing sheet. The specific steps are:

[0047] S1.1 When the energy of the carbon ion beam is in the range of 80-286.715MeV / u, since the equivalent thickness of 26.368mm corresponds to the range of the carbon ion beam with an energy of 286.715MeV / u, that is to say, the carbon ion beam is not used within this range. The multi-layer Faraday cylinder of the energy reducing film 7 can also cover the carbon ion beam current within the energy range, so the energy reducing film 7 is not used to direct...

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Abstract

The invention belongs to the technical field of accelerators, and relates to a multi-layer Faraday cup measurement system and method for carbon ion beam measurement, and the system comprises a housing, a plurality of groups of measurement layers, a slot, and a multipath galvanometer. The measuring layer is arranged in the shell and comprises a metal layer and an insulating layer, the metal layer is arranged on the insulating layer, and the measuring plane of the metal layer is perpendicular to the incident direction of a carbon ion beam; the slot is arranged on the shell, is connected with the metal layer in each group of measuring layers and is used for transmitting a charge signal obtained by the metal layer to the multi-path galvanometer; and the multipath galvanometer is used for analyzing the charge signal obtained by the metal layer to obtain the peak position of the charge quantity curve, and the peak position is the range of the carbon ion beam. The range of the carbon ion beam with the energy of 80-430 MeV can be rapidly obtained, and meanwhile the high range resolution ratio is achieved.

Description

technical field [0001] The invention relates to a multi-layer Faraday cylinder measurement system and method for carbon ion beam measurement, belonging to the field of radiotherapy, in particular to the field of carbon ion therapy system range measurement. Background technique [0002] In recent years, carbon ion radiotherapy has developed rapidly. How to accurately deliver the radiation dose to the tumor target area is a hot spot in the field of carbon ion radiotherapy. Clinically, the most accurate way of dose verification is to calibrate the dose distribution of the carbon ion beam with a water tank. The range of the carbon ion beam determines the position of the Bragg peak, which is one of the most important parameters of the carbon ion beam. Although the measurements of the tank are very accurate, it takes a long time to install and measure and does not take advantage of saving treatment machine time. [0003] At present, multilayer ionization chambers (also called B...

Claims

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Application Information

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IPC IPC(8): G01T1/29
CPCG01T1/29
Inventor 唐凯赵祖龙丁家坚陈玉聪胡正国毛瑞士徐治国康新才杨永良李娟刘通冯永春
Owner INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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