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Journal of Biomedical Physics & Engineering

H Dowlatabadi, A A Mowlavi, M Ghorbani
Objective: The aim of the present study is to simulate 6 MV and 18 MV photon beam energies of a Siemens Primus Plus medical linear accelerator (Linac) and to verify the simulation by comparing the results with the measured data. Methods: The main components of the head of Siemens Primus Plus linac were simulated using MCNPX Monte Carlo (MC) code. To verify the results, experimental data of percentage depth dose (PDD) and beam dose profile for 5 × 5 cm2 , 10 × 10 cm2 and 20 × 20 cm2 field sizes were measured and compared with simulation results...
December 2017: Journal of Biomedical Physics & Engineering
M S Golvardi Yazdi, M Naderizadeh, R Afzalipour, H A Abedi, M Radmehr, R Golvardi Yazdi, Sh Salari Pashaghi
Introduction: Many items are needed for dressing including sterile dressing set, antiseptic and washing solutions, leucoplast tape, waste bin for infectious garbage, waste bin for noninfectious garbage, safe disposal trash for sharp cutting instruments, bedpan and sometimes drugs. All the items are laid out on a simple wheeled trolley. The multiplicity of items together with problems in placing tools on trolley, forgetting some items, disturbing sterile condition, falling and damaging equipment and the need for at least two people for each procedure, all are the reasons to design and develop Automatic Trolley for Washing and Dressing the Wounds...
December 2017: Journal of Biomedical Physics & Engineering
A Garavand, M Samadbeik, M Kafashi, Sh Abhari
Background: Mobile health is one of the new technologies for the utilization of health information. For its successful implementation as well as any other system, we must primarily measure the adoption and use of its factors. The purpose of this study was to systematically investigate published articles about the factors affecting the adoption of mobile health and categorizing the factors affecting the adoption of this system. Methods: This study is a comprehensive review done by searching major databases such as Google Scholar, Emerald, Science Direct, Iran Medex, SID, Magiran, Pub med, etc...
December 2017: Journal of Biomedical Physics & Engineering
A Tavakoli Golpaygani, M M Movahedi, M Reza
Introduction: Nowadays, more than 10,000 different types of medical devices can be found in hospitals. This way, medical electrical equipment is being employed in a wide variety of fields in medical sciences with different physiological effects and measurements. Hospitals and medical centers must ensure that their critical medical devices are safe, accurate, reliable and operational at the required level of performance. Defibrillators are critical resuscitation devices. The use of reliable defibirillators has led to more effective treatments and improved patient safety through better control and management of complications during Cardiopulmonary Resuscitation (CPR)...
December 2017: Journal of Biomedical Physics & Engineering
A Shanei, Z Alinasab, A Kiani, M A Nematollahi
Objective: It is well-known that all living cells emit ultra-weak photon emission (UPE), which is due to byproducts of chemical reactions in cell metabolisms. It has been shown that Reactive Oxygen Species (ROS) in the cells enhances the UPE intensity. The magnitude of such UPE is extremely weak (i.e. a few to 10 3 photons/ (sec.cm2 2 )), and the detection of such ultra-weak signals is hardly possible via sensitive instruments like photomultiplier tube (PMT) that can detect single photons...
December 2017: Journal of Biomedical Physics & Engineering
R Zeinali, A Keshtkar, A Zamani, N Gharehaghaji
Background: Volume estimation of brain is important for many neurological applications. It is necessary in measuring brain growth and changes in brain in normal/abnormal patients. Thus, accurate brain volume measurement is very important. Magnetic resonance imaging (MRI) is the method of choice for volume quantification due to excellent levels of image resolution and between-tissue contrast. Stereology method is a good method for estimating volume but it requires to segment enough MRI slices and have a good resolution...
December 2017: Journal of Biomedical Physics & Engineering
A Soleimani, S H Rasta, T Banaei, A Asgharsharghi Bonab
Introduction: The aim of the present study was to determine burn intensity in retinal laser photocoagulation based on laser parameters; wavelength, power, beam size and pulse duration, using Optical Coherence Tomography (OCT), fundus camera, physical eye model and computer simulation in a clinical study. Materials and Methods: Participants were 10 adult patients between 50-80 years with proliferative diabetic retinopathy. A multicolor-photo coagulator with 532 nm green and 672 nm red for retina photocoagulation in diabetic retinopathy was used to investigate the participants...
December 2017: Journal of Biomedical Physics & Engineering
A H Heidari, A Shabestani Monfared, H Mozdarani, A Mahmoudzadeh, A Razzaghdoust
Background: We intend to study the inhibitory effect of sulfur compound in Ramsar hot spring mineral on tumor-genesis ability of high natural background radiation. Objective: The radioprotective effect of sulfur compounds was previously shown on radiation-induced chromosomal aberration, micronuclei in mouse bone marrow cells and human peripheral lymphocyte. Ramsar is known for having the highest level of natural background radiation on Earth. This study was performed to show the radioprotective effect of sulfur-containing Ramsar mineral water on mouse bone marrow cells...
December 2017: Journal of Biomedical Physics & Engineering
M H Bahreyni-Toosi, M H Zare, A Ale-Davood, M T Shakeri, S Soudmand
Background and Objective: Multi-walled Carbon Nano Tubes (MWCNTs) as an important element of nanosciences have a remarkable absorption in the region of NIR window (650-900 nm) which can overcome the limitations of deep treatment in photothermal therapy. To disperse MWCNTs in water, it is proposed to attach carboxylated functional group (-COOH) to MWCNTs in order to increase dispersivity in water. Materials and Methods: A stable suspension of MWCNTs-COOH with different concentrations (from 2...
December 2017: Journal of Biomedical Physics & Engineering
J Eslami, Gh Mortazavi, S A R Mortazavi
No abstract text is available yet for this article.
December 2017: Journal of Biomedical Physics & Engineering
M Ghofrani Jahromi, H Parsaei, A Zamani, M Dehbozorgi
Background: Electromyographic (EMG) signal decomposition is the process by which an EMG signal is decomposed into its constituent motor unit potential trains (MUPTs). A major step in EMG decomposition is feature extraction in which each detected motor unit potential (MUP) is represented by a feature vector. As with any other pattern recognition system, feature extraction has a significant impact on the performance of a decomposition system. EMG decomposition has been studied well and several systems were proposed, but feature extraction step has not been investigated in detail...
December 2017: Journal of Biomedical Physics & Engineering
M Farokhzadi, A Maleki, A Fallah, S Rashidi
Estimating the elbow angle using shoulder data is very important and valuable in Functional Electrical Stimulation (FES) systems which can be useful in assisting C5/C6 SCI patients. Much research has been conducted based on the elbow-shoulder synergies. The aim of this study was the online estimation of elbow flexion/extension angle from the upper arm acceleration signals during ADLs. For this, a three-level hierarchical structure was proposed based on a new approach, i.e. 'the movement phases'. These levels include Clustering, Recognition using HMMs and Angle estimation using neural networks...
September 2017: Journal of Biomedical Physics & Engineering
M Keshtkar, M H Zahmatkesh, A R Montazerabadi
BACKGROUND: Polymer gel dosimeters combined with magnetic resonance imaging (MRI) can be used for dose verification of advanced radiation therapy techniques. However, the uncertainty of dose map measured by gel dosimeter should be known. The purpose of this study is to investigate the uncertainty related to calibration curve and MRI protocol for MAGIC (Methacrylic and Ascorbic acid in Gelatin Initiated by Copper) gel and finally ways of optimization MRI protocol is introduced. MATERIALS AND METHODS: MAGIC gel was prepared by the Fong et al...
September 2017: Journal of Biomedical Physics & Engineering
L Khojastepour, S Mohammadzadeh, M Jazayeri, M Omidi
BACKGROUND: Jaw bone quality plays an essential role in treatment planning and prognosis of dental implants. Regarding several available methods for bone density measurements, they are not routinely used before implant surgery due to hard accessibility. OBJECTIVE: An in vitro investigation of correlation between average gray scale in direct digital radiographs and Hounsfield units in CT-Scan provides a feasible method for evaluating alveolar bone quality prior to implant surgery...
September 2017: Journal of Biomedical Physics & Engineering
T Sedaghatian, M Momennezhad, S H Rasta, Y Makhdoomi, S Abdollahian
PURPOSE: Fiber carbon is the most common material used in treating couch as it causes less beam attenuation than other materials. Beam attenuation replaces build-up region, reduces skin-sparing effect and causes target volume under dosage. In this study, we aimed to evaluate beam attenuation and variation of build-up region in 550 TxT radiotherapy couch. MATERIALS AND METHODS: In this study, we utilized cylindrical PMMA Farmer chamber, DOSE-1 electrometer and set PMMA phantom in isocenter of gantry and the Farmer chamber on the phantom...
September 2017: Journal of Biomedical Physics & Engineering
B Maghsoudi, S M J Mortazavi, S Khademi, P Vatankhah
INTRODUCTION: Little information is available concerning the radiation exposure of anesthesiologists, and no such data have previously been collected in Iran. This prospective study was performed to determine the amount of radiation exposure of anesthesiologists for the purpose of assessing whether or not dangerous levels of radiation exposures were being reached, and to identify factors that correlate with excessive risk. PARTICIPANTS AND METHODS: The radiation exposure of all anesthesiology residents and the attending of Shiraz University of Medical Sciences during a 3-month period (from June to August 2016) was measured using a film badge with monthly readings...
September 2017: Journal of Biomedical Physics & Engineering
Z Farshidfar, F Faeghi, H R Haghighatkhah, J Abdolmohammadi
BACKGROUND AND OBJECTIVE: Magnetic resonance imaging (MRI) is the most sensitive technique to detect multiple sclerosis (MS) plaques in central nervous system. In some cases, the patients who were suspected to MS, Whereas MRI images are normal, but whether patients don't have MS plaques or MRI images are not enough optimized enough in order to show MS plaques? The aim of the current study is evaluating the efficiency of different MRI sequences in order to better detection of MS plaques...
September 2017: Journal of Biomedical Physics & Engineering
M Alizadeh Zarei, M A Takhshid, A Behzad Behbahani, S Y Hosseini, M A Okhovat, Gh R Rafiee Dehbidi, M A Mosleh Shirazi
BACKGROUND: Radiation therapy is among the most conventional cancer therapeutic modalities with effective local tumor control. However, due to the development of radio-resistance, tumor recurrence and metastasis often occur following radiation therapy. In recent years, combination of radiotherapy and gene therapy has been suggested to overcome this problem. The aim of the current study was to explore the potential synergistic effects of N-Myc Downstream-Regulated Gene 2 (NDRG2) overexpression, a newly identified candidate tumor suppressor gene, with radiotherapy against proliferation of prostate LNCaP cell line...
September 2017: Journal of Biomedical Physics & Engineering
F Hosseini, N Naghavi
BACKGROUND: Angiogenesis initiated by cancerous cells is the process by which new blood vessels are formed to enhance oxygenation and growth of tumor. OBJECTIVE: In this paper, we present a new multiscale mathematical model for the formation of a vascular network in tumor angiogenesis process. METHODS: Our model couples an improved sprout spacing model as a stochastic mathematical model of sprouting along an existing parent blood vessel, with a mathematical model of sprout progression in the extracellular matrix (ECM) in response to some tumor angiogenic factors (TAFs)...
September 2017: Journal of Biomedical Physics & Engineering
F Seif, M J Tahmasebi-Birgani, M R Bayatiani
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 of calculated linear attenuation coefficient with this new method are in acceptable range...
September 2017: Journal of Biomedical Physics & Engineering
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