en Radiation Biology Radiation Biology گزارش کوتاه Short Report <p dir="ltr" style="text-align: justify;"><strong>Background:</strong> One major challenge in brachytherapy is to verify the accuracy of dose distributions calculated by the treatment planning system. In this project, a new phantom design has been introduced for quality assurance of dose distributions in gynocological (GYN) brachytherapy implants using EBT GafChromic film. <strong>Materials and Methods:</strong> This phantom has been designed and fabricated from 90 slabs of 18&times;16&times;0.2 cm³ Perspex to accommodate a tandem and ovoids assembly, which is normally used for GYN brachytherapy treatment. In addition, this phantom design is allowing the use EBT GafChromic films for dosimetric verification of GYN implants with Cs-137 Selectron LDR system. With this assembly, GafChromic films were exposed using a plan designed to deliver 2.5 Gy dose to point <span dir="rtl">&quot;</span>A<span dir="rtl">&quot;</span> in Manchester system for tandem and ovoids configurations and to deliver 1.5 Gy of dose to 0.5 cm distance from the lateral surface of ovoids for using ovoid-pair. The measured dose distributions with GafChromic films were compared with the TPS isodose lines both numerically and spatially. For a quantitative analysis of the results, the measured doses values at several points of interest were evaluated with the treatment planning data and values obtained following the TG-43 dose calculation formalism.<strong> Results: </strong>The results of these investigations have indicated that the new phantom design enables us to measure differences of greater than &plusmn;6% for LDR brachytherapy GYN treatments. <strong>Conclusion:</strong> The new phantom design could be utilized for the QA procedure of the brachytherapy remote after loading systems to confirm the accuracy of dose distribution in GYN implants.</p> <p></p> <p dir="ltr" style="text-align: justify;"></p> QA brachytherapy phantom, film dose measurements, Selectron LDR system, TG-43 67 71 http://ijrr.com/browse.php?a_code=A-10-1-599&slc_lang=en&sid=1 S. Gholami sgholami@razi.tums.ac.ir 790031947532846008117 790031947532846008117 No Tehran University of Medical Sciences H.R. Mirzaei mirzaei65@yahoo.com 790031947532846008118 790031947532846008118 Yes Shohada e Tajrish Hospital A. Jabbary Arfaee 790031947532846008119 790031947532846008119 No Shohada e Tajrish Hospital R. Jaberi 790031947532846008120 790031947532846008120 No Cancer institute H.A. Nedaie 790031947532846008121 790031947532846008121 No Cancer institute S. Rabi Mahdavi 790031947532846008122 790031947532846008122 No Iran University of Medical Sciences E. Rajab Bolookat 790031947532846008123 790031947532846008123 No Shohada e Tajrish Hospital A.S. Meigooni 790031947532846008124 790031947532846008124 No Comprehensive Cancer Centers of Nevada