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Journal of Biomedical Physics & Engineering

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https://www.readbyqxmd.com/read/28580340/a-system-for-continuous-estimating-and-monitoring-cardiac-output-via-arterial-waveform-analysis
#1
A Vakily, H Parsaei, M M Movahhedi, M A Sahmeddini
BACKGROUND: Cardiac output (CO) is the total volume of blood pumped by the heart per minute and is a function of heart rate and stroke volume. CO is one of the most important parameters for monitoring cardiac function, estimating global oxygen delivery and understanding the causes of high blood pressure. Hence, measuring CO has always been a matter of interest to researchers and clinicians. Several methods have been developed for this purpose, but a majority of them are either invasive, too expensive or need special expertise and experience...
June 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28580339/can-evolutionary-based-brain-map-be-used-as-a-complementary-diagnostic-tool-with-fmri-ct-and-pet-for-schizophrenic-patients
#2
R Boostani, M Sabeti
OBJECTIVE: In this research, a new approach termed as "evolutionary-based brain map" is presented as a diagnostic tool to classify schizophrenic and control subjects by distinguishing their electroencephalogram (EEG) features. METHODS: Particle swarm optimization (PSO) is employed to find discriminative frequency bands from different EEG channels. By deploying the energy of those selected frequency bands from different channels within each time frame (window) on the scalp geometry, a sort of two dimensional points along with their values are created; by applying Lagrange interpolation, an image can be constructed...
June 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28580338/exposure-to-visible-light-emitted-from-smartphones-and-tablets-increases-the-proliferation-of-staphylococcus-aureus-can-this-be-linked-to-acne
#3
M Taheri, M Darabyan, E Izadbakhsh, F Nouri, M Haghani, S A R Mortazavi, G Mortazavi, S M J Mortazavi, M Moradi
BACKGROUND: Due to rapid advances in modern technologies such as telecommunication technology, the world has witnessed an exponential growth in the use of digital handheld devices (e.g. smartphones and tablets). This drastic growth has resulted in increased global concerns about the safety of these devices. Smartphones, tablets, laptops, and other digital screens emit high levels of short-wavelength visible light (i.e. blue color region in the visible light spectrum). MATERIAL AND METHODS: At a dark environment, Staphylococcus aureus bacteria were exposed to the light emitted from common tablets/smartphones...
June 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28580337/neural-network-based-learning-kernel-for-automatic-segmentation-of-multiple-sclerosis-lesions-on-magnetic-resonance-images
#4
H Khastavaneh, H Ebrahimpour-Komleh
BACKGROUND: Multiple Sclerosis (MS) is a degenerative disease of central nervous system. MS patients have some dead tissues in their brains called MS lesions. MRI is an imaging technique sensitive to soft tissues such as brain that shows MS lesions as hyper-intense or hypo-intense signals. Since manual segmentation of these lesions is a laborious and time consuming task, automatic segmentation is a need. MATERIALS AND METHODS: In order to segment MS lesions, a method based on learning kernels has been proposed...
June 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28580336/simulation-study-of-hemodynamic-in-bifurcations-for-cerebral-arteriovenous-malformation-using-electrical-analogy
#5
Y Kiran Kumar, S B Mehta, M Ramachandra
BACKGROUND AND OBJECTIVE: Cerebral Arteriovenous Malformation (CAVM) hemodynamic is disease condition, results changes in the flow and pressure level in cerebral blood vessels. Measuring flow and pressure without catheter intervention along the vessel is big challenge due to vessel bifurcations/complex bifurcations in Arteriovenous Malformation patients. The vessel geometry in CAVM patients are complex, composed of varying diameters, lengths, and bifurcations of various angles. The variations in the vessel diameter and bifurcation angle complicate the measurement and analysis of blood flow features invasively or non-invasively...
June 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28580335/adaptive-response-induced-by-pre-exposure-to-915-mhz-radiofrequency-a-possible-role-for-antioxidant-enzyme-activity
#6
S M J Mortazavi, Z Mostafavi-Pour, M Daneshmand, F Zal, R Zare, M A Mosleh-Shirazi
BACKGROUND: Over the past few years, the rapid use of high frequency electromagnetic fields like mobile phones has raised global concerns about the negative health effects of its use. Adaptive response is the ability of a cell or tissue to better resist stress damage by prior exposure to a lesser amount of stress. This study aimed to assess whether radiofrequency radiation can induce adaptive response by changing the antioxidant balance. MATERIALS AND METHODS: In order to assess RF-induced adaptive response in tissues, we evaluated the level of GSH and the activity of GR in liver...
June 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28580334/melatonin-role-in-ameliorating-radiation-induced-skin-damage-from-theory-to-practice-a-review-of-literature
#7
REVIEW
A Abbaszadeh, G H Haddadi, Z Haddadi
Normal skin is composed of epidermis and dermis. Skin is susceptible to radiation damage because it is a continuously renewing organ containing rapidly proliferating mature cells. Radiation burn is a damage to the skin or other biological tissues caused by exposure to radiofrequency energy or ionizing radiation. Acute skin reaction is the most frequently occurring side effect of radiation therapy. Generally, any chemical/biological agent given before or at the time of irradiation to prevent or ameliorate damage to normal tissues is called a radioprotector...
June 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28580333/oral-administration-of-vitamin-c-cimetidine-and-famotidine-on-micronuclei-induced-by-low-dose-radiation-in-mouse-bone-marrow-cells
#8
A Naeeji, H Mozdarani, A Shabestani Monfared, F Faeghi, A A Ahmadi, M Gholami, R Behzadi, M R Momtaz
BACKGROUND: In many studies, chemicals and natural materials were tested to reduce the harmful effects of radiation. It is known that Famotidine and vitamin C reduce DNA damage. OBJECTIVE: The aim of this study was to evaluate the radioprotective effect of vitamin C, Cimetidine and Famotidine on gamma-radiation-induced damage on mouse bone marrow. METHODS: Six-to-seven week male NMRI mice (28 g ±3) were randomly divided into fourteen groups: control, 2Gy irradiation, six group drugs without irradition (Famotidine, Cimetidine, vitaminC, Fam-Cim, Fam-Vit, Cim-Vit), six groups received drugs and 2Gy radiation with a 60Co |γ|-ray source at room temperature 22 ± 2 °C...
June 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28580332/enhancement-of-toxic-substances-clearance-from-blood-equvalent-solution-and-human-whole-blood-through-high-flux-dialyzer-by-1-mhz-ultrasound
#9
M B Shiran, M Barzegar Marvasti, A Shakeri-Zadeh, M Shahidi, N Tabkhi, F Farkhondeh, E Kalantar, A Asadinejad
BACKGROUND: Hemodialysis is a process of removing waste and excess fluid from blood when kidneys cannot function efficiently. It often involves diverting blood to the filter of the dialysis machin to be cleared of toxic substances. Fouling of pores in dialysis membrane caused by adhesion of plasma protein and other toxins will reduce the efficacy of the filtre. OBJECTIVE: In This study, the influence of pulsed ultrasound waves on diffusion and the prevention of fouling in the filter membrane were investigated...
June 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28580331/beam-collimation-during-lumbar-spine-radiography-a-retrospective-study
#10
V Karami, M Zabihzadeh
INTRODUCTION: Collimating the primary beam to the area of diagnostic interest (ADI) has been strongly recommended as an effective method to reduce patient's radiation dose and to improve image quality during radiology practice. Lack or inadequate collimation results in excessive radiation dose to patients and deterioration image quality. OBJECTIVE: To assess the quality of beam collimation during lumbar spine radiography at two general hospitals in Ahvaz, Iran. MATERIALS AND METHODS: We retrospectively reviewed 830 digital antero-posterior (AP) lumbar spine radiographs in term of beam collimation...
June 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28580330/analysis-of-relative-biological-effectiveness-of-proton-beams-and-iso-effective-dose-profiles-using-geant4
#11
M A Hosseini, S B Jia, M Ebrahimi-Loushab
BACKGROUND: The assessment of RBE quantity in the treatment of cancer tumors with proton beams in treatment planning systems (TPS) is of high significance. Given the significance of the issue and the studies conducted in the literature, this quantity is fixed and is taken as equal to 1.1. OBJECTIVE: The main objective of this study was to assess RBE quantity of proton beams and their variations in different depths of the tumor. This dependency makes RBE values used in TPS no longer be fixed as they depend on the depth of the tumor and therefore this dependency causes some changes in the physical dose profile...
June 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28462208/diagnosis-of-the-ocd-patients-using-drawing-features-of-the-bender-gestalt-shapes
#12
R Boostani, F Asadi, N Mohammadi
BACKGROUND: Since psychological tests such as questionnaire or drawing tests are almost qualitative, their results carry a degree of uncertainty and sometimes subjectivity. The deficiency of all drawing tests is that the assessment is carried out after drawing the objects and lots of information such as pen angle, speed, curvature and pressure are missed through the test. In other words, the psychologists cannot assess their patients while running the tests. One of the famous drawing tests to measure the degree of Obsession Compulsion Disorder (OCD) is the Bender Gestalt, though its reliability is not promising...
March 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28451582/smart-phone-acceptance-among-physicians-application-of-structural-equation-modelling-in-the-largest-iranian-university
#13
M Nematollahi, K Faghiri, O Barati, P Bastani
BACKGROUND: The present study aimed to determine attitudes and effective factors in the acceptance of smart phones by physicians of the largest University of Medical Sciences in the south of Iran. METHODS: This cross-sectional study was performed using Structural Equation Modelling (SEM) in 2014. Study participants included 200 physicians working in the hospitals of Shiraz University of Medical Sciences selected through two-stage stratified sampling, but 185 participants completed the study...
March 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28451581/effect-of-exposure-to-900-mhz-gsm-mobile-phone-radiofrequency-radiation-on-estrogen-receptor-methylation-status-in-colon-cells-of-male-sprague-dawley-rats
#14
P Mokarram, M Sheikhi, S M J Mortazavi, S Saeb, N Shokrpour
BACKGROUND: Over the past several years, the rapidly increasing use of mobile phones has raised global concerns about the biological effects of exposure to radiofrequency (RF) radiation. Numerous studies have shown that exposure to electromagnetic fields (EMFs) can be associated with effects on the nervous, endocrine, immune, cardiovascular, hematopoietic and ocular systems. In spite of genetic diversity, the onset and progression of cancer can be controlled by epigenetic mechanisms such as gene promoter methylation...
March 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28451580/a-wireless-electronic-esophageal-stethoscope-for-continuous-monitoring-of-cardiovascular-and-respiratory-systems-during-anaesthesia
#15
H Parsaei, A Vakily, A M Shafiei
BACKGROUND: The basic requirements for monitoring anesthetized patients during surgery are assessing cardiac and respiratory function. Esophageal stethoscopes have been developed for this purpose, but these devices may not provide clear heart and lung sound due to existence of various noises in operating rooms. In addition, the stethoscope is not applicable for continues monitoring, and it is unsuitable for observing inaccessible patients in some conditions such as during CT scan. OBJECTIVE: A wireless electronic esophageal stethoscope is designed for continues auscultation of heart and lung sounds in anesthetized patients...
March 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28451579/comparative-analysis-of-neural-network-training-methods-in-real-time-radiotherapy
#16
S Nouri, S M Hosseini Pooya, J Soltani Nabipour
BACKGROUND: The motions of body and tumor in some regions such as chest during radiotherapy treatments are one of the major concerns protecting normal tissues against high doses. By using real-time radiotherapy technique, it is possible to increase the accuracy of delivered dose to the tumor region by means of tracing markers on the body of patients. OBJECTIVE: This study evaluates the accuracy of some artificial intelligence methods including neural network and those of combination with genetic algorithm as well as particle swarm optimization (PSO) estimating tumor positions in real-time radiotherapy...
March 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28451578/a-pca-ica-based-fetal-ecg-extraction-from-mother-abdominal-recordings-by-means-of-a-novel-data-driven-approach-to-fetal-ecg-quality-assessment
#17
A Karimi Rahmati, S K Setarehdan, B N Araabi
BACKGROUND: Fetal electrocardiography is a developing field that provides valuable information on the fetal health during pregnancy. By early diagnosis and treatment of fetal heart problems, more survival chance is given to the infant. OBJECTIVE: HASH(0x35c9200) MATERIALS AND METHODS: Here, we extract fetal ECG from maternal abdominal recordings and detect R-peaks in order to recognize fetal heart rate. On the next step, we find a better and more qualified extracted fetal ECG by using a novel approach...
March 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28451577/expression-levels-of-two-dna-repair-related-genes-under-8-gy-ionizing-radiation-and-100-mg-kg-melatonin-delivery-in-rat-peripheral-blood
#18
M Valizadeh, A Shirazi, P Izadi, J Tavakkoly Bazzaz, H Rezaeejam
BACKGROUND: After radiation therapy (RT), some health hazards including DNA damages may occur where melatonin can play a protective role due to free radical generation. On the other hand, serious accidental overexposures may occur during RT due to nuclear accidents which necessitate the need for study on exposure to high-dose radiations during treatments. OBJECTIVE: The aim of this study was to study the expression level of two genes in non-homologous end joining (NHEJ) pathways named Xrcc4 and Xrcc6 (Ku70) in order to examine the effect of melatonin on repair of DNA double-strand breaks (BSBs) caused by 8Gy ionizing radiation...
March 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28451576/thyroid-ultrasonography-in-differentiation-between-graves-disease-and-hashimoto-s-thyroiditis
#19
P Pishdad, G R Pishdad, S Tavanaa, R Pishdad, R Jalli
OBJECTIVE: Graves' disease and Hashimoto's thyroiditis are the most common causes of hyper and hypothyroidism, respectively. Differentiation of these 2 diseases, if the patient is euthyroid, may sometimes be extremely difficult on the basis of clinical and laboratory findings. The purpose of this study was to determine the sensitivity and specificity of gray scale sonography in differentiation of Graves' disease from Hashimoto's thyroiditis. METHODS: This study included 149 patients divided into three groups, patients with Graves' disease (34 patients, mean age = 36...
March 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28451575/a-monte-carlo-study-on-the-effect-of-various-neutron-capturers-on-dose-distribution-in-brachytherapy-with-252-cf-source
#20
M M Firoozabadi, Gh Izadi Vasafi, K Karimi-Sh
BACKGROUND: In neutron interaction with matter and reduction of neutron energy due to multiple scatterings to the thermal energy range, increasing the probability of thermal neutron capture by neutron captures makes dose enhancement in the tumors loaded with these materials. OBJECTIVE: The purpose of this study is to evaluate dose distribution in the presence of (10)B, (157)Gd and (33)S neutron capturers and to determine the effect of these materials on dose enhancement rate for (252)Cf brachytherapy source...
March 2017: Journal of Biomedical Physics & Engineering
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