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Journal of Biomedical Physics & Engineering

M Rismanchi
Diastolic phase of cardiac function is associated with lower arterial flow and hence higher concentration of intra arterially injected drug is achieved at the site of injection. It is herein postulated that drugs show higher efficacy when injected during the diastolic phase of cardiac function. It is also postulated that this benefit cannot be achieved when the drug is injected with higher rates thus producing the same high concentration at the site of injection. Pulsed intra arterial injection also benefits from the delayed therapeutic effect of the decaying drug before the next shot of injection resaturates the targeted tissue...
June 2016: Journal of Biomedical Physics & Engineering
H Ashrafi, M Shariyat
INTRODUCTION: Nano-indentation has recently been employed as a powerful tool for determining the mechanical properties of biological tissues on nano and micro scales. A majority of soft biological tissues such as ligaments and tendons exhibit viscoelastic or time-dependent behaviors. The constitutive characterization of soft tissues is among very important subjects in clinical medicine and especially, biomechanics fields. Periodontal ligament plays an important role in initiating tooth movement when loads are applied to teeth with orthodontic appliances...
June 2016: Journal of Biomedical Physics & Engineering
Javadpour A, Mohammadi A
BACKGROUND: Regarding the importance of right diagnosis in medical applications, various methods have been exploited for processing medical images solar. The method of segmentation is used to analyze anal to miscall structures in medical imaging. OBJECTIVE: This study describes a new method for brain Magnetic Resonance Image (MRI) segmentation via a novel algorithm based on genetic and regional growth. METHODS: Among medical imaging methods, brains MRI segmentation is important due to high contrast of non-intrusive soft tissue and high spatial resolution...
June 2016: Journal of Biomedical Physics & Engineering
Kh Rezaee, E Azizi, J Haddadnia
BACKGROUND: Epilepsy is a severe disorder of the central nervous system that predisposes the person to recurrent seizures. Fifty million people worldwide suffer from epilepsy; after Alzheimer's and stroke, it is the third widespread nervous disorder. OBJECTIVE: In this paper, an algorithm to detect the onset of epileptic seizures based on the analysis of brain electrical signals (EEG) has been proposed. 844 hours of EEG were recorded form 23 pediatric patients consecutively with 163 occurrences of seizures...
June 2016: Journal of Biomedical Physics & Engineering
K Ghazikhanlou-Sani, S M P Firoozabadi, L Agha-Ghazvini, H Mahmoodzadeh
INTRODUCTION: There is many ways to assessing the electrical conductivity anisotropy of a tumor. Applying the values of tissue electrical conductivity anisotropy is crucial in numerical modeling of the electric and thermal field distribution in electroporation treatments. This study aims to calculate the tissues electrical conductivity anisotropy in patients with sarcoma tumors using diffusion tensor imaging technique. MATERIALS AND METHOD: A total of 3 subjects were involved in this study...
June 2016: Journal of Biomedical Physics & Engineering
D Khoshdel-Navi, A Shabestani-Monfared, M R Deevband, R Abdi, M Nabahati
BACKGROUND: The most efficient application of ionizing radiation is serving medical purposes and using this radiation has caused people to learn that artificial sources of radiation exposure among these resources can be of highest exposure rate. OBIECTIVE: The present study is aimed at initially establishing a baseline for local-reference dose level in Mazandaran, Iran in 12 projections of the most conventional x-ray examination. METHODS: In this study, 13 public hospitals in Mazandaran province were selected for review and required data collected for ten adult patients with mean weight of 70±10kg in each projection...
June 2016: Journal of Biomedical Physics & Engineering
M T Bahreyni Toosi, N Mohamadian, M Ghorbani, F Khorshidi, F Akbari, C Knaup
OBJECTIVE: Radiochromic EBT3 film is a later generation of radiochromic films. The aim of this study is to compare EBT and EBT3 radiochromic films in radiotherapy fields of breast cancer. METHODS: A RANDO phantom was irradiated by a 6 MV Siemens Primus linac with medial and lateral fields of radiotherapy of breast cancer. Dosimetry was performed in various points in the fields using EBT and EBT3 films. Films were scanned by a Microtek color scanner. Dose values from two films in corresponding points were compared...
June 2016: Journal of Biomedical Physics & Engineering
Mohammadi A, Mehdizadeh A R
No abstract text is available yet for this article.
June 2016: Journal of Biomedical Physics & Engineering
Gh Mortazavi, M Haghani, N Rastegarian, S Zarei, S M J Mortazavi
According to the World Health Organization (WHO), factors such as growing electricity demand, ever-advancing technologies and changes in social behaviour have led to steadily increasing exposure to man-made electromagnetic fields.  Dental amalgam fillings are among the major sources of exposure to elemental mercury vapour in the general population. Although it was previously believed that low levels are mercury (i.g. release of mercury from dental amalgam) is not hazardous, now numerous data indicate that even very low doses of mercury cause toxicity...
March 2016: Journal of Biomedical Physics & Engineering
M Abdi, M Navidbakhsh, A Razmkon
BACKGROUND AND OBJECTIVE: Numerical modeling of biological structures would be very helpful tool to analyze hundreds of human body phenomena and also diseases diagnosis. One physiologic phenomenon is blood circulatory system and heart hemodynamic performance that can be simulated by utilizing lumped method. In this study, we can predict hemodynamic behavior of one artery of circulatory system (anterior cerebral artery) when disease such as internal carotid artery occlusion is occurred...
March 2016: Journal of Biomedical Physics & Engineering
F Shekoohi Shooli, S A R Mortazavi, S Jarideh, S Nematollahii, F Yousefi, M Haghani, S M J Mortazavi, M B Shojaei-Fard
BACKGROUND: Substantial evidence indicates that exposure to electromagnetic fields (EMF) above certain levels can affect human health through triggering some biological responses. According to WHO, short-term exposure to EMF at the levels present in the home/environment do not cause any apparent detrimental effects in healthy individuals. However, now, there is a debate on whether long-term exposure to low level EMF can evoke detrimental biological responses. Although based on the Communications Act of 1934, selling, advertising, using, or importing mobile jammers which block cell phone calls and text messages are illegal acts, in some countries these devices are being used for security purpose and for prevention of cheating during examinations...
March 2016: Journal of Biomedical Physics & Engineering
S Heydarheydari, A Haghparast, M T Eivazi
BACKGROUND AND OBJECTIVE: Professional radiation workers are occupationally exposed to long-term low levels of ionizing radiation. Occupational health hazards from radiation exposure, in a large occupational segment of the population, are of special concern. Biological dosimetry can be performed in addition to physical dosimetry with the aim of individual dose assessment and biological effects. METHODS: In this biodosimetry study, some hematological parameters have been examined in 40 exposed and 40 control subjects who were matched by gender, age and occupational records (±3 years) in Kermanshah hospitals in Iran (2013-2014)...
March 2016: Journal of Biomedical Physics & Engineering
M Alizadeh, V Qaradaghi
BACKGROUND: Therapeutic and diagnosis properties of radioactive gold nanoparticle (198-AuNPs) cause them to be suitable for detection and treatment of tumors. OBJECTIVE: Electrical and optical properties of PEG-198AuNPs were examined in this paper. Polyethylene Glycol (PEG)-198 AuNPs can be used for treatment and diagnosis of small intestine tumors. METHODS: Wireless fluorescence capsule endoscopy will be able to detect emission lights of triggered Au by external light...
March 2016: Journal of Biomedical Physics & Engineering
M T Bahreyni Toossi, F Khorshidi, M Ghorbani, N Mohamadian, D Davenport
BACKGROUND: EBT and EBT3 radioChromic films have been used in radiotherapy dosimetry for years. OBJECTIVE: The aim of the current study is to compare EBT and EBT3 radioChromic films in dosimetry of radiotherapy fields for treatment of parotid cancer. METHODS: Calibrations of EBT and EBT3 films were performed with identical setups using a 6 MV photon beam of a Siemens Primus linac. Skin dose was measured at different points in the right anterior oblique (RAO) and right posterior oblique (RPO) fields by EBT and EBT3 films on a RANDO phantom...
March 2016: Journal of Biomedical Physics & Engineering
M Sadeghi, S Sina, R Faghihi
LiF, Mg and Ti cubical TLD chips (known as TLD-100) are widely used for dosimetry purposes. The repeatability of TL dosimetry is investigated by exposing them to doses of (81, 162 and 40.5 mGy) with 662keV photons of Cs-137. A group of 40 cubical TLD chips was randomly selected from a batch and the values of Element Correction Coefficient (ECC) were obtained 4 times by irradiating them to doses of 81 mGy (two times), 162mGy and 40.5mGy. Results of this study indicate that the average reproducibility of ECC calculation for 40 TLDs is 1...
December 2015: Journal of Biomedical Physics & Engineering
H Ramezanpour, H Yousefi, M Rezaei, M Rostami
BACKGROUND: Robotic needle insertion in biological tissues has been known as one the most applicable procedures in sampling, robotic injection and different medical therapies and operations. OBJECTIVE: In this paper, we would like to investigate the effects of angular velocity in soft tissue insertion procedure by considering force-displacement diagram. Non-homogenous camel liver can be exploited as a tissue sample under standard compression test with Zwick/Roell device employing 1-D axial load-cell...
December 2015: Journal of Biomedical Physics & Engineering
A Javadpour, A Mohammadi
BACKGROUND: Electroencephalography (EEG) has vital and significant applications in different medical fields and is used for the primary evaluation of neurological disorders. Hence, having easy access to suitable and useful signal is very important. Artifacts are undesirable confusions which are generally originated from inevitable human activities such as heartbeat, blinking of eyes and facial muscle activities while receiving EEG signal. It can bring about deformation in these waves though...
December 2015: Journal of Biomedical Physics & Engineering
J Eslami, F Ghafaripour, S A R Mortazavi, S M J Mortazavi, M B Shojaei-Fard
BACKGROUND: People who use home blood glucose monitors may use their mobile phones in the close vicinity of medical devices. This study is aimed at investigating the effect of the signal strength of 900 MHz GSM mobile phones on the accuracy of home blood glucose monitors. METHODS: Sixty non-diabetic volunteer individuals aged 21 - 28 years participated in this study. Blood samples were analyzed for glucose level by using a common blood glucose monitoring system...
December 2015: Journal of Biomedical Physics & Engineering
M Khadem Abolfazli, S R Mahdavi, Gh Ataei
BACKGROUND: Gold nanoparticles are emerging as promising agents for cancer therapy and are being investigated as drug carriers, photothermal agents, contrast agents and radiosensitisers. OBJECTIVE: The aim of this study is to understand characteristics of secondary electrons generated from interaction of gold nanoparticles GNPs with x-rays as a function of nanoparticle size and beam energy and thereby further understanding of GNP-enhanced radiotherapy. METHODS: Effective range, defection angle, dose deposition, energy, and interaction processes of electrons produced from the interaction of x-rays with a GNP were calculated by Monte Carlo simulations...
December 2015: Journal of Biomedical Physics & Engineering
A Janbabanezhad Toori, A Shabestani-Monfared, M R Deevband, R Abdi, M Nabahati
BACKGROUND: Medical X-rays are the largest man-made source of public exposure to ionizing radiation. While the benefits of Computed Tomography (CT) are well known in accurate diagnosis, those benefits are not risk-free. CT is a device with higher patient dose in comparison with other conventional radiation procedures. OBJECTIVE: This study is aimed at evaluating radiation dose to patients from Computed Tomography (CT) examination in Mazandaran hospitals and defining diagnostic reference level (DRL)...
December 2015: Journal of Biomedical Physics & Engineering
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