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International Journal of Radiation Research، جلد ۱۳، شماره ۲، صفحات ۱۲۷-۱۳۴
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عنوان انگلیسی Out-of-field photon dosimetry study between 3-D conformal and intensity modulated radiation therapy in the management of prostate cancer
چکیده انگلیسی مقاله Background: The present work aims to study the out-of-field photon calculation accuracy of a commercial treatment planning system (TPS), Oncentra, for three-dimensional conformal radiotherapy (3D-CRT) and intensity modulated radiation therapy (IMRT) treatment techniques from Elekta Synergy medical linear accelerator. Materials and Methods: Accuracy of individual out-of-field dose components was studied by defining a square field of 10 x 10 cm2 in our TPS and it is verified by using ionization chamber and TLDs (Thermoluminescent dosimeter) at 5 cm depth. Using 3D-CRT and IMRT techniques Ca (carcinoma) prostate treatment plans were created using 6 MV photon beam and calculated in Oncentra Masterplan v4.3 planning systems for out-of-field and further compared the same with TLD measurements. Results: Individual components study shows the poor out-of-field calculations in TPS, with respect to that obtained from TLD measurements. Underestimation increases from 10 % to 80 % as a contribution from various components while moving far from field edge. Complex IMRT plans resemble this underestimation of TPS calculations in greater extend. Conclusion: This study quantifies the poor accuracy for out-of-field dose calculations in TPS. No significant difference in 3D-CRT and IMRT plans is found at near field edge. While, as distance from field edge increases, underestimation of TPS in IMRT plan is higher. 10 % – 60 % difference in out-of-field dose was found as distance move from 2 cm to 7.5 cm far from field edge between TPS estimations and the measurements.
کلیدواژه‌های انگلیسی مقاله TPS, TLD, out-of-field dose, 3D-CRT, IMRT
نویسندگان مقاله t siji cyriac | t siji cyriac
department of physics, noorul islam centre for higher education, kumaracoil, thuckalay, kanyakumari district, 629 180, tamilnadu, india


محمد مهدی musthafa | m m musthafa
department of physics, university of calicut, thenhipalam, malappuram, 673 635, kerala, india


r ganapathi رامان | r ganapathi raman
department of physics, noorul islam centre for higher education, kumaracoil, thuckalay, kanyakumari district, 629 180, tamilnadu, india


k بینتی haneefa | k abdul haneefa
infn and department of physics, university of torino, via p. giuria, 10125, torino, italy


saju bhasi | saju bhasi
department of radiation physics, regional cancer center, trivandrum, 695 011 , kerala, india
نشانی اینترنتی http://www.ijrr.com/browse.php?a_code=A-10-1-550&slc_lang=en&sid=en
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کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده Radiation Biology
نوع مقاله منتشر شده تحقیق بدیع
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