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| Comparative study on proton and heavy lon accelerator's dose distribution of radiation field measured with EBT3 film and radiation optical dosimetry system |
| YUAN Jilong, CHENG Jinsheng |
| Key Laboratory, Institute for Radiological Protection and Nuclear Safety, Chinese Center for Disease Control and Prevention, Beijing 100088 China |
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Abstract Objective Comparative analysis of the quality control measurements of the offline EBT3 film analysis and the online real-time analysis radiation optical dosimetry system in proton and heavy ion accelerator's radiation field dose distribution.Methods For active spot scan protons and carbon ions, the spread-out Bragg peak (SOBP) is 3 cm, and the range is 7 cm, 16 cm, 29 cm, respectively, radiotherapy planning system plans 100 mm×100 mm radiation fields, Using EBT3 film and radiation optical dosimetry to measure the dose distribution of the radiation field under various conditions, the EBT3 are scanned after 24 hours' irradiation and the optical system's image are acquired by real time shooting. The comparative dosimetry index is the Full width at half maximum (FWHM).Results Through comparative analysis, regardless of physical significance or statistical analysis, both detectors could measure the dose distribution of proton and heavy ion radiation field, and the results have good consistency and accuracy.Conclusion Both detectors meet the measurement requirements for proton and heavy ion radiation field's dosimetry parameters, Radiation optical dosimetry is capable of on-line dose distribution of radiation field measurement in real time, and more suitable for the development of the quality control of radiation therapy.
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Received: 19 March 2018
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