Ali Asghar Mowlavi
Physics Department, School of Sciences, Hakim Sabzevari University, Sabzevar, Iran. ICTP, Associate federation Scheme, Medical Physics Field, Trieste, Italy.
[ 1 ] - Calculation of the X-Ray Spectrum of a Mammography System with Various Voltages and Different Anode-Filter Combinations Using MCNP Code
Introduction One of the best methods in the diagnosis and control of breast cancer is mammography. The importance of mammography is directly related to its value in the detection of breast cancer in the early stages, which leads to a more effective treatment. The purpose of this article was to calculate the X-ray spectrum in a mammography system with Monte Carlo codes, including MCNPX and MCNP5...
[ 2 ] - شبیه‌ساز تومور فعال سازی شده توسط نقره و برآورد بهبود دز در فوتون درمانی
Treatment of radio-sensitized tumor is one of the promising modalities in radiotherapy. Since the different parameters and physical conditions vary in the treatments, the use of simulation models is easier, less costly and faster than practical methods for forecasting the solutions designed to optimize treatment. Therefore in this study, Monte Carlo simulations are applied to investigate the do...
[ 3 ] - بهینه‌سازی مکان چشمه‌های براکی تراپی در دو و سه بعد با کاربست الگوریتم ژنتیک
Optimization in radiotherapy is one of an important and attractive topic in Medical Physics. In this study, we have written a computer code base on genetic algorithm using MATLAB software, to optimize the best places of brachytherapy sources with optimal value of a parameter which is determined by weight. The weight parameter is related to the activity of each seed implant brachytherapy sources...
[ 4 ] - برآورد دوز جذبی مؤثر سالیانه ناشی از گازهای رادون و تورون در مجاور گسل‌های فعال در شمال شرق ایران
زمینه: گسل‌های فعال در واقع به عنوان مهم‌ترین عامل ورود رادون و تورون به سطح زمین می‌باشند. قرار گرفتن مناطق مسکونی بر روی این گسل‌ها یکی از دلایل اصلی افزایش تراکم این دو گاز رادیواکتیو در آنها است. مواد و روش‌ها: با استفاده از دستگاه اندازه‌گیری RTM1688 میزان غلظت رادون و تورون در 200 منزل مسکونی نزدیک به گسل‌های فعال در خراسان شمالی واقع در شمال شرق ایران اندازه‌گیری شد. یافته‌ها: دامنه ا...
[ 5 ] - Impact of range straggling and multiple scattering on proton therapy of brain, using a slab head phantom
Background: The advantages of proton beam in radiation therapy- like small lateral scattering as well as absence of exit dose tail in the organs which are after the tumor- make it capable of delivering more treatment doses to the target and much lesser to the critical tissues near it. Materials and Methods: In this study, the Monte Carlo MCNPX code has been used to simulate a slab head phantom ...
[ 6 ] - The role of natural ventilation on reducing indoor radon concentration
Due to the increasing of closed ventilation systems used in buildings, the risk of indoor radon is increased day by day. In this study, we selected two sample rooms to calculate the radon emission coefficient from different levels, radon concentration measured when the natural ventilation was completely closed and compared with the analytical results. The results clearly show the difference in ...
[ 7 ] - Designing an approprate solenoid and magnetic field for the HZDR laser-driven beamline
Nowadays, due to the high costs and large dimensions of the conventional proton accelerators, other optimal methods for producing the proton beam have been studied. Using of Laser-driven proton accelerators is one of the important and new methods. In laser-driven ion acceleration, a highly ultra-intense laser pulse interacts with solid density targets and will create a plasma media that will ac...
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