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International Journal of Radiation Research، جلد ۱۴، شماره ۱، صفحات ۵۹-۶۵
عنوان فارسی
چکیده فارسی مقاله
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عنوان انگلیسی Evaluation of MRI-based MAGIC polymer gel dosimeter in small photon fields
چکیده انگلیسی مقاله Background: Accurate small radiation field dosimetry is essential in modern radiotherapy techniques such as stereotactic radiosurgery (SRS) and intensity modulated radiotherapy (IMRT). Precise measurement of dosimetric parameters such as beam profile, percentage depth doses and output factor of these beams are complicated due to the electron disequilibrium and the steep dose gradients. In the present work the MAGIC polymer gel was used for dosimetry of small circular photon beams. The results of MAGIC were compared with EBT2 measurements and Monte Carlo (MC) calculations. Materials and Methods: Experimental measurements were made by mentioned dosimeters in four small field sizes 5, 10, 20 and 30 mm. The BEAMnrc code based on EGSnrc was used for simulation to calculate dosimetric parameters at these small fields. The phantoms were irradiated in a 6 MV photon beam Varian 2100C linear accelerator at SSD=100 cm. gel readout performed by 3 Tesla MRI scanner. Results: The results showed that the Percent depth dose (PDD) values measured and calculated by EBT2 film and MC had maximum local differences 4% and 5% with PDD values measured by MAGIC for field size of 5mm respectively. These differences decreased for larger field sizes. The measurements of output factor and penumbra (80%-20%) and (90%-10%) showed good agreement between the measurements and MC calculation. Conclusion: This study showed that the MAGIC polymer gel based on high resolution MRI images is useful detector for small field dosimetry but its agreement with MC is less than agreement of EBT2 film with MC.
کلیدواژه‌های انگلیسی مقاله Small field, Monte Carlo, penumbra, MAGIC polymer gel
نویسندگان مقاله w پروایی | w. parwaie
department of radiology, faculty of para-medicine, hormozgan university of medical sciences, bandar abbas, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی هرمزگان (Hormozgan university of medical sciences)

m یاراحمدی | m. yarahmadi
department of medical physics, faculty of medicine, kurdistan university of medical sciences, sanandaj, iran


حسینعلی ندایی | h a nedaie
department of radiotherapy, cancer institute, tehran university of medical sciences, tehran, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی تهران (Tehran university of medical sciences)

محمدحسین زحمتکش | m h zahmatkesh
shahid beheshti university of medical sciences, tehran, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (Shahid beheshti university of medical sciences)

امیرحسین براتی | a h barati
department of medical physics, faculty of medicine, kurdistan university of medical sciences, sanandaj, iran


m افخمی | m. afkhami
department of radiology, faculty of para-medicine, hormozgan university of medical sciences, bandar abbas, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی هرمزگان (Hormozgan university of medical sciences)

نشانی اینترنتی http://www.ijrr.com/browse.php?a_code=A-10-1-598&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 مرور و بررسی کلی
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