Carbon ion range/energy measurement method and device

A technology of energy measurement and carbon ions, which is applied in the direction of measuring devices, X-ray energy spectrum distribution measurement, radiation measurement, etc., to achieve the effects of easy and frequent positioning, small volume and mass, and strong stability

Active Publication Date: 2019-08-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

At present, there are range measurement methods including inserting miniature ion chamber method, PET method, distributed prompt gamma method, etc., but due to its intrusion (ion chamber), delay, and uncertainty, it has not yet become an effective range measurement method.

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  • Carbon ion range/energy measurement method and device
  • Carbon ion range/energy measurement method and device

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example

[0031] This example is illustrated with a 3600 MeV carbon ion incident water box.

[0032] (1) Determine the appropriate measurement site according to the incident energy of carbon ions. For example, for carbon ions with an energy of 3600 MeV, it is suitable to select a position with a water equivalent depth of about 15 cm to place the detection equipment. The ion energy and CT image are selected, and generally the position is selected 2 cm before the end of the set range.

[0033] (2) if figure 1 As shown, place the corresponding measuring equipment in a suitable position, and the collimator needs to be close to the surface of the model to improve the detection efficiency.

[0034] (3) The detection system obtains such as diagram 2-1 , Figure 2-2 The prompt gamma energy spectrum shown, where diagram 2-1 Collected when the detection point is set at 16.3 cm, Figure 2-2 It was collected when the detection point was set at 14.8 cm. In both spectra, there is a gamma peak...

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Abstract

The invention, which belongs to the field of radiotherapy and radiation detection, discloses a carbon ion range / energy measurement method and device, thereby realizing real-time, in-vivo and non-invasive carbon ion range / energy measurement. With the disclosed method and device, the range uncertainty in the process of carbon ion radiotherapy can be reduced; and the method and device are mainly applied to application occasions needing acquisition of the range / energy of the carbon ion beam in the object. The method comprises: acquiring a prompt gamma energy spectrum generated in the carbon ion treatment process by a measuring device; quantifying a Doppler offset peak position of the characteristic gamma in the energy spectrum; and carrying out calculation based on a numerical algorithm to obtain carbon ion energy and a range. Besides, the device includes a single-slit collimator, a main detector, an active shielding device, a signal amplifying device, a multi-channel data registration andcollecting module, and a computer processing unit. Compared with the traditional method, the carbon ion range / energy measurement method and device have advantages of a non-invasive mode, real-time measurement and detection array avoidance and has the broad application prospects.

Description

technical field [0001] The invention belongs to the field of radiotherapy and radiation detection, in particular to a method and device for measuring the range / energy of carbon ions. [0002] technical background [0003] Carbon ions deposit most of the energy at the end of the range (the Bragg peak) in the tissue. By adjusting the carbon ion energy to place the Bragg peak at the tumor position, it can protect normal tissues well, and carbon ions have the advantage of high biological effects. Therefore, it has attracted the attention of the radiotherapy community. In the process of carbon ion therapy, factors such as changes in anatomical structure (between fractional treatments), patient setup errors, and CT conversion coefficient errors will cause the carbon ion range to fail to meet expectations accurately, and the Bragg peak dose deposition characteristics determine The dose distribution of carbon ion therapy is extremely sensitive to range uncertainty, that is, a small ...

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Application Information

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IPC IPC(8): G01T1/36A61N5/10
CPCG01T1/362A61N5/1075
Inventor 耿长冉韩阳汤晓斌刘渊豪
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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