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Detecting method for detector matrix relative response relationship for radiation dosage spatial distribution measuring

A technology of spatial distribution and radiation dose, applied in radiation measurement, instruments, etc., can solve problems such as the influence of spatial dose distribution measurement results, uncertain response differences, etc., and achieve the effect of less steps and reliable evaluation data

Inactive Publication Date: 2015-04-08
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 used in the radiation dose spatial distribution measurement, which overcomes the uncertainty of the response difference between the detection units in the existing detector matrix, which leads to the measurement of the spatial dose distribution. Defects that affect the outcome

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  • Detecting method for detector matrix relative response relationship for radiation dosage spatial distribution measuring
  • Detecting method for detector matrix relative response relationship for radiation dosage spatial distribution measuring
  • Detecting method for detector matrix relative response relationship for radiation dosage spatial distribution measuring

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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 detecting method for a detector matrix relative response relationship for radiation dosage spatial distribution measuring. The detecting method comprises the following steps: a step (1) of penetrating a beam main axis through the center of a linear matrix from the front surface along normal of the center of the linear matrix, setting the position as an initial position, acquiring measured data of a group of radiation fields after a beam emitting condition is stabilized, recording the measured data of the initial position of each detecting element; a step (2) of integrally moving a detector matrix, so that adjacent two branch detectors are used for receiving the same radiation on the same radiation field position in sequence, and recording the measured data of each moved detecting element; a step (3) of respectively obtaining the measured results of adjacent two detecting elements on a position corresponding to each detecting element after the step (1) and the step (2), and calculating the relative response relationship between the detecting elements through a recursive algorithm. The detecting method is simple and easy to perform, free of special requirements on radiation fields for measuring, less in steps of a measuring process, and reliable in 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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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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