Valiallah Saba
Radiation Research Center, Faculty of Paramedicine, AJA University of Medical Sciences, Tehran, Iran
[ 1 ] - New approach for calibration of pixelated scintillation detectors of intraoperative gamma cameras
Introduction:SURGEOSIGHT is a dedicated intra-operative hand-held gamma camera designed and manufactured by our team to be used for lymphoscintigraphy. Although conventional gamma cameras are widely used, they lack the capability of the sentinel lymph node (SLN) imaging in the operation room. Like conventional gamma cameras it is necessary to calibrate SURGEOSIGHT for linearity...
[ 2 ] - بررسی اثرات محافظتی تحریکات مغناطیسی جمجمه‌ای مکرر (rTMS) بر حملات تشنج و آسیبهای نورونی در موشهای صحرایی
مقدمه: صرع به عنوان یکی از اختلالات مزمن مغز شناخته شده است که جمعیت زیادی در سراسر جهان به آن مبتلا میباشند. تشنج باید هر چه سریعتر درمان شود تا از تبدیل شدن به صرع مزمن جلوگیری گردد. ضمناً روش‌های جراحی و درمان دارویی دارای برخی عوارض جانبی هستند. تحریکات مغناطیسی جمجمه‌ای برای تولید جریان در مغز پیشنهاد شده است و می‌تواند جایگزینی برای درمان دارویی و جراحی باشد. ما نقش محافظت‌کنندگی تحریکات...
[ 3 ] - A Study of Various Feature Extraction Methods on a Motor Imagery Based Brain Computer Interface System
Introduction: Brain Computer Interface (BCI) systems based on Movement Imagination (MI) are widely used in recent decades. Separate feature extraction methods are employed in the MI data sets and classified in Virtual Reality (VR) environments for real-time applications. Methods: This study applied wide variety of features on the recorded data using Linear Discriminant Analysis (LDA) classifie...
[ 4 ] - A Real-Time Electroencephalography Classification in Emotion Assessment Based on Synthetic Statistical-Frequency Feature Extraction and Feature Selection
Purpose: To assess three main emotions (happy, sad and calm) by various classifiers, using appropriate feature extraction and feature selection. Materials and Methods: In this study a combination of Power Spectral Density and a series of statistical features are proposed as statistical-frequency features. Next, a feature selection method from pattern recognition (PR) Tools is presented to e...
[ 5 ] - Improving the quality of images synthesized by discrete cosines transform – regression based method using principle component analysis
Purpose: Different views of an individuals’ image may be required for proper face recognition. Recently, discrete cosines transform (DCT) based method has been used to synthesize virtual views of an image using only one frontal image. In this work the performance of two different algorithms was examined to produce virtual views of one frontal image. Materials and Methods: Two new meth...
[ 6 ] - میکروب زدایی باکتریها با استفاده از پلاسمای DBD در فشار جو
مقدمه و هدف: میکروب زدایی سطوح موضوع مهمی در حوزه های مختلف مثل پزشکی و صنعت غذایی می باشد. روش های سنتی میکروب زدایی دارای اثرات گرمایی و اثرات جانبی مضری مثل تولید پسماند های شیمیایی سمی می باشند. استفاده از پلاسمای سرد برای میکروب زدایی روشی است که اخیرا مورد توجه قرار گرفته است. پارامترهای مختلفی که در تولید پلاسمای سرد تاثیر دارند می توانند میزان اثر گذاری این روش در میکروب...
[ 7 ] - بررسی تأثیر کاهش ولتاژ و زاویه دار کردن گانتری بر میزان دوز دریافتی لنز چشم در تصویر برداری سی تی اسکن با استفاده از کد محاسباتی MCNPx
Introduction: Eye lens is a very sensitive organ to the x-ray radiation and cataract could be formed as a result of eye exposure. Computed tomography (CT) is one of the main exposure sources in clinical situations and brain imaging delivers high amount of exposure to the eye lens. To reduce eye lens dose, efficient dose reduction methods have to be developed and implemented. In this paper, the ...
[ 8 ] - تخمین هزینه بهره وری غربالگری سرطان ریه در ایران توسط تصویر برداری سی تی اسکن دوز پایین با در نظر گرفتن تعداد تشخیص های زودهنگام
Introduction: Lung cancer is the most common and most deadly cancer in most of countries of the world. One of the most significant problems with this cancer is the lack of accurate and specific statistics about the prevalence and mortality rate in Iran. Results of cancer registry program in 2008 in Iran indicated a low incidence rate of lung cancer. However, these statistics...
[ 9 ] - تجزیه و تحلیل احساسات افراد از طریق سیگنال های مغزی با استفاده از تابع نگاشت پوانکاره
Introduction: Dynamic alterations of the brain are of high significance when it comes to analyze the human feelings. In this study, the hidden patterns corresponding for the emotional states have been investigated by adopting a certain Poincare’ map function inspired by the theory of chaos. The present study aimed to explore the significance relationship between the proposed methodology and the...
[ 10 ] - Assessing the image quality and eye lens dose reduction using bismuth shielding in computed tomography of brain
Background: Epidemiological studies show that computed tomography (CT) is one of the main sources of ionizing radiations. Shielding of radiosensitive organs is one of the dose reduction methods. This study aimed to assess the eye lens dose reduction and image quality resulting from the use of radio-protective bismuth shield in brain CT imaging. Methods: Bismut...
[ 11 ] - Application of Different methods for Reducing Radiation Dose to Breast during MDCT
The increased use of computed tomography (CT) and its high radiation dose have led to great concerns about its potential for radiation induced cancer risks. Breast is a radiosensitive tissue based on tissue weighting factors assigned by the International Commission on Radiological Protection (ICRP). Moreover, the dose is maximal on the surface of the patient. Therefore, strategies should be tak...
[ 12 ] - Larger Volume and Different Activation of the Brain in Response to Threat in Military Officers
Introduction: Military missions involve stressful and life-threatening situations; however, soldiers should have a healthy cognition on the battlefield despite their high-stress levels. This is an ability that should be gained during prior military training. Successful and influential training is suggested to be associated with structural and functional improvements of the brain. Methods: This...
نویسندگان همکار