ابطحی, سید محمد مهدی
دانشگاه بین المللی امام خمینی
[ 1 ] - ارزیابی تغییرات توزیع دز در مقطع نگاری کامپیوتری با تغییر موازی سازی با استفاده از فیلم EBT و فانتوم PMMA
X-ray computed tomography is an imaging method which makes tomographic images with high contrast and resolution. However, CT-scans deliver much more radiation dose compared with other imaging techniques. The aim of this study was to evaluate two-dimensional dose distribution in a PMMA phantom as well as investigationof the effect ofcollimation factor on the dose distribution measuredusing GAF-C...
[ 2 ] - Investigation of the dose enhancement effect of spherical bismuth oxide nanoparticles in external beam radiotherapy
Introduction: External radiotherapy is the most common method of radiotherapy which the most important problem associated with is that there is no difference between healthy and tumor tissues in dose absorption. One way to differentiate the dose sensitivity is to use metal-based nanoparticles. Bismuth oxide nanoparticles are good candidates for cancer radiotherapy. In this study, we investigate...
[ 3 ] - Assessment of secondary particles in breast proton therapy by Monte Carlo simulation code using MCNPX
Background: The present study aimed to investigate the equivalent dose in vital organs, including heart and lung, due to secondary particles produced during breast proton therapy. Materials and Methods: The numerical ORNL female-phantom was improved and simulated using the Monte Carlo MCNPX code. The depth-dose profile of proton beams with different energies was simulated. The proper energy ran...
[ 4 ] - Evaluation of the dose and flux of secondary particles in the lung tissue in breast proton therapy using the Monte Carlo simulation code
Unlike proton therapy, conventional radiation therapy directs X-rays not only at the tumor but also unavoidably at nearby healthy tissue. Protons deliver radiation to tumor tissue while the healthy structures will be spared during proton therapy. When protons travel through matter, secondary particles like neutrons and photons are produced. It is believed that the secondary dose can lead to sec...
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