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Detection method of relative response relationship of detector matrix for measuring radiation dose spatial distribution

A technology of spatial distribution and radiation dose, applied in radiation measurement, instruments, etc., can solve the problems of uncertainty of response difference, influence of spatial dose distribution measurement results, etc. Effect

Inactive Publication Date: 2017-06-13
NAT INST OF METROLOGY CHINA
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a detection method for the relative response relationship of the detector matrix for radiation dose spatial distribution measurement, which overcomes the uncertainty of the response difference between the detection elements in the existing detector matrix, which leads to the measurement of spatial dose distribution. Defects that affect the outcome

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  • Detection method of relative response relationship of detector matrix for measuring radiation dose spatial distribution
  • Detection method of relative response relationship of detector matrix for measuring radiation dose spatial distribution
  • Detection method of relative response relationship of detector matrix for measuring radiation dose spatial distribution

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Embodiment 1

[0033]Methods The relative response relationship of the MatriXX Evolution detector matrix produced by German IBA company was evaluated in the Co-60 γ-ray radiation field, and the measurement data were re-corrected with the evaluation results. The detector measures point by point. The result is as Figure 4 shown.

[0034] Depend on Figure 4 It can be seen that there is a maximum ± 5% difference between the measurement results without data correction obtained by the evaluation method and the point-by-point measurement results using a separate detector, while the measurement results after the evaluation and correction of the present invention and the point-by-point measurement results using a separate detector The result difference of the point measurement is less than 1%, which proves that the method is reliable and can effectively solve the influence of the response difference between the detection elements in the detector on the measurement result of the spatial dose distr...

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Abstract

The invention relates to a method for detecting the relative response relationship of a detector matrix for radiation dose spatial distribution measurement, comprising the following steps: Step (1) The main axis of the beam passes through the center of the line matrix from the front along the normal line of the center of the line matrix, and this position is used as the initial position , after the beam output conditions are stable, collect a set of measurement data of the radiation field, and record the measurement data of the initial position of each detection element; step (2) move the detector matrix as a whole, so that two adjacent detectors are in the radiation field in turn. Receive the same radiation at the same position, and record the measurement data of each detection element after moving; step (3) After step (1) and step (2), two adjacent For the measurement results of the detection elements, a recursive algorithm is used to calculate the relative response relationship between the detection elements. The method is simple and easy to implement, has no special requirements for the radiation field used in the measurement, has fewer steps in the measurement process, and has reliable evaluation data.

Description

technical field [0001] The invention relates to a detection method for the relative response relationship of a detector matrix used for measuring radiation dose spatial distribution, spatial distribution measurement and dose verification of radiation dose in radiotherapy, and other fields of measuring radiation dose spatial distribution. Background technique [0002] The detector matrix is ​​a device used to measure the spatial distribution of radiation dose. The detection unit of the device is composed of multiple detectors arranged according to certain rules to form a one-dimensional or two-dimensional detector array. At present, there is no effective method to evaluate the relative response relationship of the detectors that make up the detector matrix, so as to solve the influence of the uncertainty of the response difference between the detection units on the measurement results of the spatial dose distribution. Contents of the invention [0003] The technical problem...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T7/00
Inventor 张辉张彦立龚晓明夏渲
Owner NAT INST OF METROLOGY CHINA
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