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Journal of Biomedical Physics & Engineering

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https://www.readbyqxmd.com/read/30320038/radiation-exposure-and-bell-s-palsy-a-hypothetical-association
#1
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
https://www.readbyqxmd.com/read/30320037/does-exposure-to-static-magnetic-fields-generated-by-magnetic-resonance-imaging-scanners-raise-safety-problems-for-personnel
#2
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
https://www.readbyqxmd.com/read/30320036/applications-of-inertial-navigation-systems-in-medical-engineering
#3
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
https://www.readbyqxmd.com/read/30320035/assessment-of-adherence-of-diagnostic-accuracy-studies-published-in-radiology-journals-to-stard-statement-indexed-in-web-of-science-pubmed-scopus-in-2015
#4
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
https://www.readbyqxmd.com/read/30320034/comparison-of-parametric-and-non-parametric-eeg-feature-extraction-methods-in-detection-of-pediatric-migraine-without-aura
#5
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
https://www.readbyqxmd.com/read/30320033/smart-diabetic-screening-and-managing-software-a-novel-decision-support-system
#6
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
https://www.readbyqxmd.com/read/30320032/trunk-kinematic-analysis-during-gait-in-cerebral-palsy-children-with-crouch-gait-pattern
#7
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
https://www.readbyqxmd.com/read/30320031/does-high-frequency-transcutaneous-electrical-nerve-stimulation-tens-affect-eeg-gamma-band-activity
#8
M Ebrahimian, M Razeghi, A Zamani, Z Bagheri, K Rastegar, A Motealleh
Background: Transcutaneous electrical nerve stimulation (TENS) is a noninvasive, inexpensive and safe analgesic technique used for relieving acute and chronic pain. However, despite all these advantages, there has been very little research into the therapeutic effects of TENS on brain activity. To the best of our knowledge, there is no evidence on the effect of high frequency TENS on the gamma band activity. Objective: Investigation of the effect of high frequency TENS on the electroencephalographic (EEG) gamma band activity after inducing ischemic pain in healthy volunteers is considered...
September 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/30320030/mrs-shimming-an-important-point-which-should-not-be-ignored
#9
B Zeinali-Rafsanjani, R Faghihi, M A Mosleh-Shirazi, Saeedi-M Moghadam, M Lotfi, R Jalli, S Sina, L Mina
Background: Proton magnetic resonance spectroscopy (MRS) is a well-known device for analyzing the biological fluids metabolically. Obtaining accurate and reliable information via MRS needs a homogeneous magnetic field in order to provide well-defined peaks and uniform water suppression. There are lots of reasons which can disturb the magnetic field homogeneity which can be corrected by a process known as shimming. This study is intended to recall the importance of shimming and also the significant role of quality control (QC) in achieving an accurate quantification...
September 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/30320029/differentiation-of-edematous-tumoral-and-normal-areas-of-brain-using-diffusion-tensor-and-neurite-orientation-dispersion-and-density-imaging
#10
S Masjoodi, H Hashemi, M A Oghabian, G Sharifi
Background: Presurigical planning for glioma tumor resection and radiotherapy treatment require proper delineation of tumoral and peritumoral areas of brain. Diffusion tensor imaging (DTI) is the most common mathematical model applied for diffusion weighted MRI data. Neurite orientation dispersion and density imaging (NODDI) is another mathematical model for DWI data modeling. Objective: We studied whether extracted parameters of DTI, and NODDI models can be used to differentiate between edematous, tumoral, and normal areas in brain white matter (WM)...
September 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/30320028/the-effect-of-gold-nanoparticles-on-electrical-impedance-of-tissue-on-low-frequency-ranges
#11
M Ostovari, N Riahi Alam, M Zabihzadeh, M M Gharibvand, M Hoseini-Ghahfarokhi
Introduction: Electrical impedance of tissues on low frequencies includes useful information about functional and structural changes in tissues. This property is used in Electrical Impedance Tomography (EIT) imaging modality for the detection of lesions in tissues. Objective: The goal of this article is to study changes in electrical impedance of tissues in the presence of gold nanoparticles. Materials and Methods: Spherical gold nanoparticles with size of 20-25 nm were synthesized with Turkevich method...
September 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/30320027/the-influence-of-brass-compensator-thickness-and-field-size-on-neutron-contamination-spectrum-in-18mv-elekta-sl-75-25-medical-linear-accelerator-with-and-without-flattening-filter-a-monte-carlo-study
#12
A S Talebi, M Maleki, P Hejazi, M Jadidi, R Ghorbani
Background: One of the most significant Intensity Modulated Radiation Therapy treatment benefits is a high target to normal tissue dose ratio. To improve this advantage, an additional accessory such as a compensator is used to deliver doses. Compensator-based IMRT treatment is usually operated with an energy higher than 10 MV. Photoneutrons, which have high linear energy transfer and radiobiological effectiveness, are produced by colliding high-energy photon beams with linear accelerator structures, then they deliver the unwanted doses to patients and staff...
September 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/30320026/evaluation-of-aaa-and-xvmc-algorithms-for-dose-calculation-in-lung-equivalent-heterogeneity-in-photon-fields-a-comparison-of-calculated-results-with-measurements
#13
N Singh, N K Painuly, L N Chaudhari, A Chairmadurai, T Verma, D Shrotiya, C P Bhatt
Aims: The aims of the present work are (1) to evaluate dose calculation accuracy of two commonly used algorithms for 15 MV small photon fields in a medium encompassing heterogeneity and (2) to compare them with measured results obtained from gafchromic film EBT2. Materials and Methods: Authors employed kailwood (Pinus Wallichiana) to mimic lung. Briefly, seven Kailwood plates, each measuring 25x25 cm2 of varying thicknesses totaling 13 cm equivalent to the mean thickness of an adult human lung, were sandwiched between 5 cm tissue equivalent material from top and 10 cm below...
September 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29951449/design-and-production-of-two-piece-thyroid-neck-phantom-by-the-concurrent-use-of-epoxy-resin-and-poly-methyl-methacrylate-soft-tissue-equivalent-materials
#14
M Karimi, H Mostaghimi, S F Shams, A R Mehdizadeh
The aim of this report is to present a new two-piece thyroid-neck phantom produced by the concurrent use of epoxy resin and poly(methyl methacrylate) (PMMA: plexiglass) soft tissue equivalent materials. Accordingly, mass attenuation coefficients of the epoxy resin and the plexiglass compounds were obtained from simulation (NIST XCOM 3.1) and measurements (practical dosimetry) and compared to those related to human soft tissue (ICRU 44). The thyroid-neck phantom and thyroid gland dimensions were derived from scientific references and the atlas of human anatomy, respectively...
June 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29951448/closed-and-open-loop-deep-brain-stimulation-methods-challenges-current-and-future-aspects
#15
P Ghasemi, T Sahraee, A Mohammadi
Deep brain stimulation (DBS) is known as the most effective technique in the treatment of neurodegenerative diseases, especially Parkinson disease (PD) and epilepsy. Relative healing and effective control of disease symptoms are the most significant reasons for the tangible tendency in use and development of this technology. Nevertheless, more cellular and molecular investigations are required to reveal the detailed mechanism of DBS. Here, we reviewed the methods, challenges and the ways to overcome the limitations of DBS...
June 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29951447/a-comparison-of-six-ultrasound-stimulation-types-on-pseudomonas-aeruginosa-growth-in-vitro
#16
A Q Alneami, E Gh Khalil, R A Mohsien, A F Albeldawi
Background: This work evaluated the efficiency of common ultrasound stimulation (U.S.S) types on bacterial growth in vitro using clinically relevant conditions. Objective: To estimate different frequencies ultrasound bactericidal ability on bacteria in bacteria of Pseudomonas Aeruginosa. Material and Methods: Six types of U.S.S (continuous wave, 7w/cm2 , 20 KHz; continuous wave, 35w/0.8L, 40 KHz; continuous wave, 5w/cm2 , 1.1 MHz; pulsed wave, 5w/cm2 , 3...
June 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29951446/correlation-between-trunk-pelvis-inter-segmental-coordination-parameters-during-walking-and-disability-level-in-chronic-low-back-pain-patients
#17
S Ebrahimi, F Kamali, M Razeghi, S A Haghpanah
Background: Chronic low back pain (CLBP) disability has been particularly frustrating because its treatment has been a great therapeutic challenge. Disability has been suggested to depend on different factors that should be found and considered in the medical management. The inter-segmental coordination is often impaired in CLBP subjects; however, to the best of our knowledge, there is no evidence about the relationship between the existence of coordination problems and disability in CLBP patients...
June 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29951445/effect-of-microwave-wi-fi-radiation-at-frequency-of-2-4-ghz-on-epileptic-behavior-of-rats
#18
Mahmoudi A, Shojaeifard M B, Nematollahii S, Mortazavi S M J, Mehdizadeh A R
Background: Electromagnetic fields (EMF) with different intensities are widely used at home, offices and public places.Today, there is a growing global concern about the effects of human exposure to EMFs. Epilepsy is one of the most common chronic neurological diseases, affecting 50 million people of all ages worldwide. We aimed to investigate the effect of exposure to Wi-Fi radiation on epileptic behavior of rats. Materials and Methods: 147 male rats, weighing 200-250 g, were divided into seven groups; negative control (no intervention), sham 1(distilled water), positive control (Pentylentetrazol [PTZ]), intervention group 1 (PTZ + Wi-Fi "off"), sham 2 (distilled water + Wi-Fi "off"), sham 3 (distilled water + Wi-Fi "on"), and intervention group 2 (PTZ + Wi-Fi "on")...
June 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29951444/evaluation-of-blood-parameters-alteration-following-low-dose-radiation-induced-by-myocardial-perfusion-imaging
#19
M S Alavi, M A Okhovat, M Atefi, F Khajeh Rahimi, S Mortazavi, F Ebadi
Introduction: With increasing the usage of myocardial perfusion imaging (MPI) for the diagnosis of ischemic heart disease, we aimed to evaluate the side effects of low-dose radiation induced by this technique on blood elements, especially proteins and liver function factors. Material and Methods: 40 eligible patients (Mean age: 54.62±10.35, 22 female and 18 male), who had referred to the nuclear medicine department for MPI from May till August 2014, were enrolled in the study...
June 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29951443/an-aptamer-based-biosensor-for-troponin-i-detection-in-diagnosis-of-myocardial-infarction
#20
M Negahdary, M Behjati-Ardakani, N Sattarahmady, H Heli
Background: Acute myocardial infarction (MI) accounts for one third of deaths. Cardiac troponin I (TnI) is a reliable biomarker of cardiac muscle tissue injury and is employed in the early diagnosis of MI. Objective: In this study, a molecular method is introduced to early diagnosis of MI by rapid detection of TnI. Materials and Methods: The detection method was based on electrochemical aptasensing, being developed using different methods and evaluation steps...
June 2018: Journal of Biomedical Physics & Engineering
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