چاپ صفحه |  صفحه نخست سامانه |  نویسندگان |  اطلاعات تفضیلی |  دانلود مقاله | دانشگاه علوم پزشکی تبریز |
| نویسنده ثبت کننده مقاله | پریناز محنتی |
| مرحله جاری مقاله | تایید نهایی |
| دانشکده/مرکز مربوطه | تیم های تحقیقاتی دانشگاه |
| کد مقاله | 81223 |
| عنوان فارسی مقاله | تفسیر نسبت خروجی درون هوا میدان های گوه خورده در شرایط مختلف اندازه گیری |
| عنوان لاتین مقاله | Interpretation of In-air Output Ratio of Wedged Fields in Different Measurement Conditions |
| نوع ارائه | پوستر |
| عنوان کنگره / همایش | دوازدهمین کنگره فیزیک پزشکی ایرانیان |
| نوع کنگره / همایش | ملی |
| کشور محل برگزاری کنگره/ همایش | Iran (Islamic Republic) |
| شهر محل برگزاری کنگره/ همایش | تهران |
| سال انتشار/ ارائه شمسی | 1397 |
| سال انتشار/ارائه میلادی | 2018 |
| تاریخ شمسی شروع و خاتمه کنگره/همایش | 1397/04/28 الی 1397/04/29 |
| آدرس لینک مقاله/ همایش در شبکه اینترنت | https://ijmp.mums.ac.ir/article_13030.html |
| آدرس علمی (Affiliation) نویسنده متقاضی | گروه فیزیک پزشکی دانشکده پزشکی دانشگاه علوم پزشکی تبریز |
| نویسنده | نفر چندم مقاله |
|---|---|
| فریده بیگلری پناه | اول |
| پریناز محنتی | دوم |
| عنوان | متن |
|---|---|
| خلاصه مقاله | Introduction: The head scatter factor (Sc) is one of the important parameters for monitor unit (MU) calculation. There are multiple factors that impact the Sc values, such as, head structures, back scattering in to dose monitoring chambers, wedges and so on. This study aimed to investigate the variations of SC with different build-up cap materials, wall thickness, Source to Skin Distance (SSDs), ionization chambers and variation of the SC with wedge angles in 6MV photon beam. Materials and Methods: In this study, Copper and Perspex build-up caps were designed and fabricated with two different thicknesses for each build-up cap. Measurements were performed on an Elekta Compact medical linear accelerator (6 MV) using RK with sensitive volume of 0.12 cc and Farmer-type ion chamber with sensitive volume of 0.65 cc. In all measurements, build-up caps and ionization chambers were positioned in a stand vertical to the beam central axis. It is also investigated the effect of different SSDs on SC. Results: The presence of wedge influences the SC values significantly. Variation of SC in open and wedged fields had maximum deviation of 0.9% and 6.8% and minimum of 0.4% and 2.7% for 30° and 60° angles of wedge, respectively. different SSD and type of ion chamber had no significant influence on the SC. In small field sizes, the SC values in copper build-up cap is higher than Perspex and in large field sizes, measured SC in perspex build-up cap is higher than copper. Conclusion: It was found that the presence of internal wedge has significant contribution to head scatter factor and it increases with increasing wedge angle. Therefore, it should be takes into account in manually MU calculations. |
| کلمات کلیدی | Head Scatter Factor Wedge Ionization Chamber Build-up cap |
| نام فایل | تاریخ درج فایل | اندازه فایل | دانلود |
|---|---|---|---|
| Interpretation of In-air Output Ratio of Wedged Fields in Different Measurement Conditions.pdf | 1402/09/01 | 192226 | دانلود |
| Interpretation of In-air Output Ratio of Wedged Fields in Different Measurement Conditions.pdf | 1402/09/04 | 147158 | دانلود |
