Dosimetry protocol for the forthcoming clinical trials in synchrotron stereotactic radiation therapy (SSRT)

التفاصيل البيبلوغرافية
العنوان: Dosimetry protocol for the forthcoming clinical trials in synchrotron stereotactic radiation therapy (SSRT)
المؤلفون: I. Martínez-Rovira, Jean-François Adam, François Estève, P. Berkvens, Hélène Elleaume, Yolanda Prezado, M. Vautrin, Alberto Bravin
المصدر: Medical Physics. 38:1709-1717
بيانات النشر: Wiley, 2011.
سنة النشر: 2011
مصطلحات موضوعية: Physics, business.industry, medicine.medical_treatment, Synchrotron radiation, General Medicine, Stereotactic radiation therapy, Imaging phantom, Synchrotron, 030218 nuclear medicine & medical imaging, law.invention, 03 medical and health sciences, 0302 clinical medicine, Beamline, law, 030220 oncology & carcinogenesis, Ionization chamber, medicine, Calibration, Dosimetry, Nuclear medicine, business
الوصف: Purpose: An adequate dosimetry protocol for synchrotron radiation and the specific features of the ID17 Biomedical Beamline at the European Synchrotron Radiation Facility are essential for the preparation of the forthcoming clinical trials in the synchrotron stereotactic radiation therapy (SSRT). The main aim of this work is the definition of a suitable protocol based on standards of dose absorbed to water. It must allow measuring the absolute dose with an uncertainty within the recommended limits for patient treatment of 2%-5%. Methods: Absolute dosimetry is performed with a thimble ionization chamber (PTW semiflex 31002) whose center is positioned at 2 g cm{sup -2} equivalent depth in water. Since the available synchrotron beam at the ESRF Biomedical Beamline has a maximum height of 3 mm, a scanning method was employed to mimic a uniform exposition of the ionization chamber. The scanning method has been shown to be equivalent to a broad beam irradiation. Different correction factors have been assessed by using Monte Carlo simulations. Results: The absolute dose absorbed to water at 80 keV was measured in reference conditions with a 2% global uncertainty, within the recommended limits. The dose rate was determined to be in the range between 14 and 18more » Gy/min, that is to say, a factor two to three times higher than the 6 Gy/min achievable in RapidArc or VMAT machines. The dose absorbed to water was also measured in a RW3 solid water phantom. This phantom is suitable for quality assurance purposes since less than 2% average difference with respect to the water phantom measurements was found. In addition, output factors were assessed for different field sizes. Conclusions: A dosimetry protocol adequate for the specific features of the SSRT technique has been developed. This protocol allows measuring the absolute dose absorbed to water with an accuracy of 2%. It is therefore satisfactory for patient treatment.« less
تدمد: 0094-2405
DOI: 10.1118/1.3556561
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::8bc29cc161f38d82bac46cb619b029ed
https://doi.org/10.1118/1.3556561
Rights: CLOSED
رقم الانضمام: edsair.doi...........8bc29cc161f38d82bac46cb619b029ed
قاعدة البيانات: OpenAIRE
الوصف
تدمد:00942405
DOI:10.1118/1.3556561