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Journal of Biomedical Physics & Engineering

M Ghahramanifar, M Haghani, A Ghadimi Moghadam, A Haghani, A K Ghadimi Moghadam
Chest tube is a flexible plastic tube used to discharge secretion in the cavity between the lungs and chest named pleural cavity. Normally, there is a small amount of fluid in the cavity between the lungs and chest; This fluid helps the movement of lungs during breathing without abrasion. Entrance of bit of air, blood or pus because injury in the pleural cavity can prevent the lungs from fully opening. Full or partial collapse of the lungs makes breathing difficult and can lead to respiratory arrest; putting chest tube in the pleural cavity causes the discharge of secretion and helps patients comfort...
December 2018: Journal of Biomedical Physics & Engineering
N Arjmandi, Gh Mortazavi, S Zarei, M Faraz, S A R Mortazavi
Since the early days of human life on the Earth, our skin has been exposed to different levels of light. Recently, due to inevitable consequences of modern life, humans are not exposed to adequate levels of natural light during the day but they are overexposed to relatively high levels of artificial light at night. Skin is a major target of oxidative stress and the link between aging and oxidative stress is well documented. Especially, extrinsic skin aging can be caused by oxidative stress. The widespread use of light emitting diodes (LEDs) and the rapidly increasing use of smartphones, tablets, laptops and desktop computers have led to a significant rise in the exposure of human eyes to short-wavelength visible light...
December 2018: Journal of Biomedical Physics & Engineering
R Yahyapour, A Salajegheh, A Safari, P Amini, A Rezaeyan, A Amraee, M Najafi
Bystander or non-targeted effect is known to be an interesting phenomenon in radiobiology. The genetic consequences of bystander effect on non-irradiated cells have shown that this phenomenon can be considered as one of the most important factors involved in secondary cancer after exposure to ionizing radiation. Every year, millions of people around the world undergo radiotherapy in order to cure different types of cancers. The most crucial aim of radiotherapy is to improve treatment efficiency by reducing early and late effects of exposure to clinical doses of radiation...
December 2018: Journal of Biomedical Physics & Engineering
M Ashtiyani, S Navaei Lavasani, A Asgharzadeh Alvar, M R Deevband
Background: Electrocardiogram (ECG) is defined as an electrical signal, which represents cardiac activity. Heart rate variability (HRV) as the variation of interval between two consecutive heartbeats represents the balance between the sympathetic and parasympathetic branches of the autonomic nervous system. Objective: In this study, we aimed to evaluate the efficiency of discrete wavelet transform (DWT) based features extracted from HRV which were further selected by genetic algorithm (GA), and were deployed by support vector machine to HRV classification...
December 2018: Journal of Biomedical Physics & Engineering
M Fooladi, H Sharini, S Masjoodi, A Khodamoradi
Background: Quantitative Magnetization Transfer Imaging (QMTI) is often used to quantify the myelin content in multiple sclerosis (MS) lesions and normal appearing brain tissues. Also, automated classifiers such as artificial neural networks (ANNs) can significantly improve the identification and classification processes of MS clinical datasets. Objective: We classified patients with relapsing-remitting multiple sclerosis (RRMS) from healthy subjects using QMTI and T1 longitudinal relaxation time data of brain white matter, then the performance of three ANN-based classifiers have been investigated...
December 2018: Journal of Biomedical Physics & Engineering
M B Shojaeifard, S Jarideh, M Owjfard, S Nematollahii, T Talaei-Khozani, M Malekzadeh
Background: The increasing demand for using mobile phones has led to increasing mobile phone jammers as well. On the other hand, reports show that exposure to electromagnetic field causes an increase in the incidence of diseases such as leukemia, cancer, depression and failure in pregnancy outcomes; therefore, the aim of this study is to investigate the effects of exposure to electromagnetic fields of mobile phone jammers on blood factors. Materials and Methods: Thirty male Wistar immature and thirty mature rats were selected randomly and each one was divided into three groups of ten...
December 2018: Journal of Biomedical Physics & Engineering
A Alipoor, R Fardid, S Sharifzadeh
Objective: Coronary heart disease (CHD) is one of the most common diseases. Coronary angiography (CAG) is an important apparatus used to diagnose and treat this disease. Since angiography is performed through exposure to ionizing radiation, it can cause harmful effects induced by double-stranded breaks in DNA which is potentially life-threatening damage. The aim of the present study is to investigate phosphorylation of Histone H2AX in the location of double-stranded breaks in peripheral blood lymphocytes as an indication of biological effects of radiation on angiography...
December 2018: Journal of Biomedical Physics & Engineering
R Parvaresh, A Haghparast, K Khoshgard, M Jalili, M T Eivazi, M Ghorbani
Aim: The aim of this study is to find an optimum material to protect garment for protection against 99 Tcm radionuclide. Materials and Methods: Monte Carlo simulation code was applied to investigate radiation attenuation of 13 shielding materials including: Ba, gray Sn, white Sn, Sb, Bi, Bi2 O3 , BaSO4 , Sn/W, Sb/W, Pb and W with thicknesses of 0.5 and 1 mm to determine an optimum protective garment material in nuclear medicine against 99 Tcm . Furthermore, the dose enhancement on the staff body was investigated for shielding materials such as tungsten and lead...
December 2018: Journal of Biomedical Physics & Engineering
S A R Mortazavi, S Parhoodeh, M A Hosseini, H Arabi, H Malakooti, S Nematollahi, G Mortazavi, L Darvish, S M J Mortazavi
Background: It has been shown that short-wavelength blue component of the visible light spectrum can alter the circadian rhythm and suppress the level of melatonin hormone. The short-wavelength light emitted by smartphones' screens can affect the sleep quality of the people who use these devices at night through suppression of melatonin. Objectives: In this study, we examined the effects of covering the screens of smartphones with different filters (changing the effective wavelength of the light) on sleep delay time in 43 healthy students...
December 2018: Journal of Biomedical Physics & Engineering
M Hoseinipourasl, M Zandkarimi, J Abdolmohammadi, K Sharifi, S Miraki
Background: Multiple sclerosis (MS) is a chronic, typically progressive and most common autoimmune disease which damaged the central nervous system. According to the reports in 2008, this disorder has affected 2 and 2.5 million people globally. While the reason is not clear, proposed causes for this include immunologic, environmental, infectious and genetic factors, and sexuality. MS can cause many symptoms, including blurred vision, loss of balance, poor coordination, slurred speech, tremors, numbness, extreme fatigue, problems with memory and concentration, paralysis, blindness, and more...
December 2018: Journal of Biomedical Physics & Engineering
M Keshtkar, D Shahbazi-Gahrouei, M A Mehrgardi, M Aghaei, S M Khoshfetrat
Introduction: One class of magnetic nanoparticles is magnetic iron oxide nanoparticles (MIONs) which has been widely offered due to of their many advantages. Owing to the extensive application of MIONs in biomedicine, before they can be used in vivo, their cytotoxicity have to be investigated. Therefore, there is an urgent need for understanding the potential risks associated with MIONs. Materials and Methods: Firstly, gold-coated Fe3 O4 nanoparticles (GMNP) were synthesized...
December 2018: Journal of Biomedical Physics & Engineering
F Falahati, A Nickfarjam, M Shabani
Background: Intensity modulated radiation therapy (IMRT) is an advanced method for delivery of three dimensional therapies, which provides optimal dose distribution with giving multiple nonuniform fluency to the patient. The complex dose distribution of IMRT should be checked to ensure that the accurate dose is delivered. Today, film dosimetry is a powerful tool for radiotherapy treatment Quality Assurance (QA) and a good method to verify dose distribution in phantoms. Objective: This study aimed to evaluate the accuracy of IMRT treatment planning system, Prowess PantherĀ® software, with Gafchromic EBT3 films in a inhomogeneity phantom...
December 2018: Journal of Biomedical Physics & Engineering
Keshtkar M, Saba V, Mosleh-Shirazi M A
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 taken to reduce radiation dose to the breast. The aim of this review is to introduce methods used for reducing radiation dose to breast in thoracic CT and review related performed studies...
December 2018: Journal of Biomedical Physics & Engineering
M Khateri, S Cheraghi, A Ghadimi, H Abdollahi
Bell's palsy is an idiopathic peripheral nerve palsy involving the facial nerve. It accounts for 60 to 75% of all cases of unilateral facial paralysis. The main mechanisms to induce BP remain unclear, but infection, ischemic condition and immunodeficiency may contribute to the development of Bell's palsy. Accumulating evidence has shown several factors can trigger the reactivation of latent HSV including psychological stressors, physical stressors and immunosuppression. Ionization and non-ionization radiations are of importance of physical stressors...
September 2018: Journal of Biomedical Physics & Engineering
A Ghadimi-Moghadam, S M J Mortazavi, A Hosseini-Moghadam, M Haghani, S Taeb, M A Hosseini, N Rastegariyan, F Arian, L Sanipour, S Aghajari, S A R Mortazavi, A Soofi, M R Dizavandi
MRI workers are occupationally exposed to static and time-varying gradient magnetic fields. While the 24-hour time-averaged exposure to static magnetic fields is about a few mT, the maximum static field strength can be as high as 500 mT during patient setup. Over the past several years, our laboratory has performed extensive experiments on the health effects of exposure of animal models and humans to different sources of electromagnetic fields such as cellular phones, mobile base stations, mobile phone jammers, laptop computers, radars, dentistry cavitrons and MRI...
September 2018: Journal of Biomedical Physics & Engineering
S V Ghasemzade, F Jamshidi
Inertial navigation systems are of the most important and practical systems in determining the velocity, position and attitude of the vehicles and different equipment. In these systems, three accelerometers and three gyroscopes are used to measure linear accelerations and angular velocities of vehicles, respectively. By using the output of these sensors and special inertial algorithms in different frames, parameters of vehicle such as position, velocity and attitude can be calculated. These systems are used in medical equipment including, but not limited to MRI devices, intelligent patient beds, surgical robots and angiography equipment...
September 2018: Journal of Biomedical Physics & Engineering
F Zarei, B Zeinali-Rafsanjani
Rationale and Objective: The objective of this study is to evaluate the methodological adherence of diagnostic accuracy studies published in radiology journals, which were indexed in different databases with the STARD standard guide 2015. Materials and Methods: The different databases were searched in order to find suitable journals. Among 84 English radiology journals, 31 journal were selected randomly. In order to find the articles, the same search fields and search terms were used...
September 2018: Journal of Biomedical Physics & Engineering
S Kazemi, P Katibeh
Background: Migraine headache without aura is the most common type of migraine especially among pediatric patients. It has always been a great challenge of migraine diagnosis using quantitative electroencephalography measurements through feature classification. It has been proven that different feature extraction and classification methods vary in terms of performance regarding detection and diagnostic accuracy. Previous work on the subject was controversial, hence a comparison of these methods seems necessary...
September 2018: Journal of Biomedical Physics & Engineering
M Ghoddusi Johari, M H Dabaghmanesh, H Zare, A R Safaeian, Gh Abdollahifard
Background: Diabetes is a serious chronic disease, and its increasing prevalence is a global concern. If diabetes mellitus is left untreated, poor control of blood glucose may cause long-term complications. A big challenge encountered by clinicians is the clinical management of diabetes. Many IT-based interventions such ad CDSS have been made to improve the adherence to the standard care for chronic diseases. Objective: The aim of this study is to establish a decision support system of diabetes management based on diabetes care guidelines in order to reduce medical errors and increase adherence to guidelines...
September 2018: Journal of Biomedical Physics & Engineering
L Abbasi, Z Rojhani-Shirazi, M Razeghi, H Raeisi Shahraki
Background: Deficits in upper body movement have received little attention during gait in cerebral palsy (CP) children with crouch gait pattern (CGP). Objective: Purpose of this research is to describe the correlation of trunk movement with the excessive knee flexion and ankle kinematic in CP children with CGP. Material and Methods: Gait analysis data from 57 limbs of diplegic CP children with CGP and 26 limbs of normal children was gathered...
September 2018: Journal of Biomedical Physics & Engineering
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