Mohamad Reza Bayatiani
Department of Medical Physics & Khansari Hospital, Arak University of Medical Sciences, Arak, Iran
[ 1 ] - Effective Point of Measurement in Cylindrical Ion Chamber for Megavoltage Photon Beams
Introduction For dose measurement in Megavoltage (MV) photon beams with ion chambers, the effect of volume occupied by the air cavity is not negligible. Therefore, the result of measurement should be corrected with a displacement perturbation correction factor (Pdis) or using an effective point of measurement (EPOM). The aim of this study is to calculate the EPOM for cylindrical ion chamber and...
[ 2 ] - بررسی اثر ایمپلنت های دندانی بر توزیع دوز رادیوتراپی به روش مونت کارلو
سابقه و هدف: با توجه به وجود ارگان های مهم در ناحیه سر و گردن، درمان تومورهایی که در این ناحیه قرار دارند، بسیار حائز اهمیت است. از آنجائیکه وجود ایمپلنت های دندانی می تواند توزیع دوز رادیوتراپی را در منطقه تحت درمان دچار اختلال کند. لذا این مقاله به منظور، بررسی اثر جنس و ابعاد ایمپلنت های دندانی بر توزیع دوز رادیوتراپی به روش مونت کارلو انجام شد. مواد و روشها: در این مطالعه، دستگاه شتاب دهند...
[ 3 ] - Evaluation of the simultaneous presence of aluminum chloride and 50 Hz magnetic field on the antioxidant capacity of blood hemoglobin and plasma in rat’s protective role of Myrtus plant
Introduction: Physical factors such as electromagnetic fields and chemical agents such as aluminum compounds can act as oxidative stress inducer. In the present study synergistic and toxic effects of aluminum in the presence of an alternating electromagnetic field is investigated. In order to make the protection the extract of Myrtus Communis was used Materials and Met...
[ 4 ] - The Correlation between Cell Phone over Use and Aggression
Introduction: Today concerns about the somatic and mental-emotional effects of exposure to electromagnetic waves have been raised. Although early thermal effects can not be attributed to these waves, It is necessary to investigate the long-term and side effects of these waves. One of the devices that has the most connection with electromagnetic waves is cell phones. In the pres...
[ 5 ] - Radiation protection properties of Myrtus communis against oxidation caused by whole-body exposure of mice
Introduction: Exposure to ionizing radiation can be through direct hit or water radiolysis lead to oxidation in biological systems. In this study, the protective effect of Myrtus Communis aqueous extract on structural changes and oxidative stress in red blood cells and plasma proteins was examined after receipt of ionizing radiation. Materials and Methods: wis...
[ 6 ] - Measure and calculation the specific absorption rate due to 900MHz waves in the brain, skin, fat and bone tissues
Introduction: Communication between mobile phones and antenna BTS (Base Transceiver station) is carried by electromagnetic waves. Energy associated with these waves can be absorbed by biological tissues. so Widespread use of these devices has generated public concern about exposure to electromagnetic waves. In this study the electric field intensity and specific absorption rate...
[ 7 ] - Effective Source-Surface Distance in Various Field Sizes and Electron Beam Energies and its Effect on Cutout Factor in a Elekta Precise Linear Accelerator
Introduction: In electron beam treatment, because of the non-point electron beam source, inverse-square law cannot be applied for dosimetry in different treatment intervals. Therefore, providing source-surface distance (SSD) charts in all clinics is of paramount importance. This study aimed to determine the effective SSD for various electron beam energies and field sizes and to...
[ 8 ] - Investigating the Impact of Knee Prosthesis in Patients’ Body on Radiation Dose Distribution: A Monte Carlo Approach
Introduction: Metal prostheses in patients affect the radiotherapy dose distribution. Metal prostheses with high density and atomic number cause major changes in scattering and attenuation of radiation. The present study aims to assess the impact of metal knee prosthesis with various dimensions and materials on radiotherapy dose distribution. Material and Methods: In this research, the Varian L...
[ 9 ] - Investigating the Effect of Air Cavities of Sinuses on the Radiotherapy Dose Distribution Using Monte Carlo Method
Background: Considering that some vital organs exist in the head and neck region, the treatment of tumors in this area is a crucial task. The existence of air cavities, namely sinuses, disrupt the radiotherapy dose distribution. The study aims to analyze the effect of maxillary, frontal, ethmoid and sphenoid sinuses on radiotherapy dose distribution by Monte Carlo method.Materials and Methods: ...
[ 10 ] - An Analytical-empirical Calculation of Linear Attenuation Coefficient of Megavoltage Photon Beams
Background: In this study, a method for linear attenuation coefficient calculation was introduced.Methods: Linear attenuation coefficient was calculated with a new method that base on the physics of interaction of photon with matter, mathematical calculation and x-ray spectrum consideration. The calculation was done for Cerrobend as a common radiotherapy modifier and Mercury.Results: The values...
[ 11 ] - Evaluation of Electron Contamination in Cancer Treatment with Megavoltage Photon Beams: Monte Carlo Study
Background: Megavoltage beams used in radiotherapy are contaminated with secondary electrons. Different parts of linac head and air above patient act as a source of this contamination. This contamination can increase damage to skin and subcutaneous tissue during radiotherapy. Monte Carlo simulation is an accurate method for dose calculation in medical dosimetry and has an important role in opt...
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