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On dosimetric characteristics of detectors for relative dosimetry in small fields: a multicenter experimental studyстатья
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
- Авторы: Casar Božidar, Mendez Ignasi, Gershkevitsh Eduard, Wegener Sonja, Jaffray David, Heaton Robert, Pesznyak Csilla, Stelczer Gabor, Bulski Wojciech, Chełminski Krzysztof, Smirnov Georgiy, Antipina Natalia, Beavis Andrew W., Harding Nicholas, Jurković Slaven, Hwang Min-Sig, Saiful Huq M.
- Журнал: Physics in Medicine and Biology
- Том: 69
- Номер: 3
- Год издания: 2024
- Издательство: IOP Publishing
- Местоположение издательства: [Bristol, UK], England
- Первая страница: 1
- Последняя страница: 14
- Номер статьи: 035009
- DOI: 10.1088/1361-6560/ad154c
- Аннотация: Objective. In this multicentric collaborative study, we aimed to verify whether the selected radiation detectors satisfy the requirements of TRS-483 Code of Practice for relative small field dosimetry in megavoltage photon beams used in radiotherapy, by investigating four dosimetric characteristics. Furthermore, we intended to analyze and complement the recommendations given in TRS-483. Approach. Short-term stability, dose linearity, dose-rate dependence, and leakage were determined for 17 models of detectors considered suitable for small field dosimetry. Altogether, 47 detectors were used in this study across ten institutions. Photon beams with 6 and 10 MV, with and without flattening filters, generated by Elekta Versa HDTM or Varian TrueBeamTM linear accelerators, were used. Main results. The tolerance level of 0.1% for stability was fulfilled by 70% of the data points. For the determination of dose linearity, two methods were considered. Results from the use of a stricter method show that the guideline of 0.1% for dose linearity is not attainable for most of the detectors used in the study. Following the second approach (squared Pearson’s correlation coefficientr 2), it was found that 100% of the data fulfill the criteria r 2> 0.999 (0.1% guideline for tolerance). Less than 50% of all data points satisfied the published tolerance of 0.1% for dose-rate dependence. Almost all data points(98.2%)satisfied the 0.1% criterion for leakage. Significance. For short-term stability (repeatability), it was found that the 0.1% guideline could not be met. Therefore, a less rigorous criterion of 0.25% is proposed. For dose linearity, our recommendation is to adopt a simple and clear methodology and to define an achievable tolerance based on the experimental data. For dose-rate dependence, a realistic criterion of 1% is proposed instead of the present 0.1%. Agreement was found with published guidelines for background signal (leakage).
- Добавил в систему: Антипина Наталья Анатольевна