Production and application of integrated dose calibration phantom
10.3969/j.issn.1672-8270.2025.06.032
- VernacularTitle:一体化剂量校准模体的制作与应用
- Author:
Yun LI
1
;
Dahui CAO
;
Yonghua QIAN
Author Information
1. 无锡市新吴区新瑞医院放疗科 无锡 214111
- Publication Type:Journal Article
- Keywords:
Dose calibration;
Integrated solid phantom;
Scale coefficient;
Absolute measurement;
Relative measurement
- From:
China Medical Equipment
2025;22(6):170-174
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To design an integrated dose calibration phantom,so as to optimize the operation process under the premise of ensuring measurement accuracy of conventional dose calibration of accelerator.Methods:According to the size of the ionization chamber,a piece of plexiglass plate with the size of 20cm×20cm×7cm was processed into an integrated solid phantom.According to the recommended measurement method in the No.IAEA277 report of International Atomic Energy Agency(IAEA),the output of selected energy beam of the accelerator was calibrated by using a one-dimensional water tank so that 100MU corresponded to 100cGy at the maximum dose point on the central axis of the beam.And then,the dose calibration of the integrated solid phantom was carried out.The measurement results of the integrated solid phantom and the one-dimensional water at the selected energy beam output were compared to analyze the reliability of the integrated solid phantom calibration.Results:Within the variation range of the accelerator output from 60 to 140 MU,the relative errors measured using the integrated solid phantom and the one-dimensional water phantom for X6 rays were-0.15%,-0.13%,-0.10%,-0.03%,and-0.03%respectively,with the same magnitude and consistent direction.The values of the E12 rays are all 0.09%,-0.03,0.02%,0.03%,and-0.02%,with the same magnitude and consistent direction.Conclusion:The integrated solid phantom can conduct routine dose calibration of accelerators,which is more convenient in operation process.Its repeat precision of positioning is significantly improved.At the same time,it can reduce various errors caused by personnel operation,and provide a more reliable and efficient solution for dose calibration.
