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Journal of Biomedical Physics & Engineering

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https://www.readbyqxmd.com/read/28144598/physicians-knowledge-about-radiation-dose-in-radiological-investigation-in-iran
#1
R Azmoonfar, H Faghirnavaz, H Younesi, E Morovati, Zh Ghorbani, M R Tohidnia
BACKGROUND: Although ionizing radiation is very important in diagnostic and treatment of many diseases, the hazards of this radiation are considerable and irrefutable. One of the main stages in radiation protection is knowledge about radiation dose in radiological investigation. The aim of this study was to determine the physicians' knowledge in radiological examinations. MATERIAL AND METHODS: The data collected by questionnaire were designed and the most commonly requested radiological investigations were listed...
December 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28144597/the-fundamental-reasons-why-laptop-computers-should-not-be-used-on-your-lap
#2
S A R Mortazavi, S Taeb, S M J Mortazavi, S Zarei, M Haghani, P Habibzadeh, M B Shojaei-Fard
As a tendency to use new technologies, gadgets such as laptop computers are becoming more popular among students, teachers, businessmen and office workers. Today laptops are a great tool for education and learning, work and personal multimedia. Millions of men, especially those in the reproductive age, are frequently using their laptop computers on the lap (thigh). Over the past several years, our lab has focused on the health effects of exposure to different sources of electromagnetic fields such as cellular phones, mobile base stations, mobile phone jammers, laptop computers, radars, dentistry cavitrons and Magnetic Resonance Imaging (MRI)...
December 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28144596/effect-of-cilia-beat-frequency-on-muco-ciliary-clearance
#3
M H Sedaghat, M M Shahmardan, M Norouzi, M Heydari
BACKGROUND: The airway surface liquid (ASL), which is a fluid layer coating the interior epithelial surface of the bronchi and bronchiolesis, plays an important defensive role against foreign particles and chemicals entering lungs. OBJECTIVE: Numerical investigation has been employed to solve two-layer model consisting of mucus layer as a viscoelastic fluid and periciliary liquid layer as a Newtonian fluid to study the effects of cilia beat frequency (CBF) at various amounts of mucus properties on muco-ciliary transport problem...
December 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28144595/extraction-of-respiratory-signal-based-on-image-clustering-and-intensity-parameters-at-radiotherapy-with-external-beam-a-comparative-study
#4
P Samadi Miandoab, A Esmaili Torshabi, S Nankali
BACKGROUND: Since tumors located in thorax region of body mainly move due to respiration, in the modern radiotherapy, there have been many attempts such as; external markers, strain gage and spirometer represent for monitoring patients' breathing signal. With the advent of fluoroscopy technique, indirect methods were proposed as an alternative approach to extract patients' breathing signals. MATERIALS AND METHODS: The purpose of this study is to extract respiratory signals using two available methods based on clustering and intensity strategies on medical image dataset of XCAT phantom...
December 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28144594/effects-of-rf-emf-exposure-from-gsm-mobile-phones-on-proliferation-rate-of-human-adipose-derived-stem-cells-an-in-vitro-study
#5
D Shahbazi-Gahrouei, B Hashemi-Beni, Z Ahmadi
BACKGROUND: As the use of mobile phones is increasing, public concern about the harmful effects of radiation emitted by these devices is also growing. In addition, protection questions and biological effects are among growing concerns which have remained largely unanswered. Stem cells are useful models to assess the effects of radiofrequency electromagnetic fields (RF-EMF) on other cell lines. Stem cells are undifferentiated biological cells that can differentiate into specialized cells...
December 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28144593/gsm-900-mhz-microwave-radiation-induced-alterations-of-insulin-level-and-histopathological-changes-of-liver-and-pancreas-in-rat
#6
S M J Mortazavi, S M Owji, M B Shojaei-Fard, M Ghader-Panah, S A R Mortazavi, A Tavakoli-Golpayegani, M Haghani, S Taeb, N Shokrpour, O Koohi
BACKGROUND: The rapidly increasing use of mobile phones has led to public concerns about possible health effects of these popular communication devices. This study is an attempt to investigate the effects of radiofrequency (RF) radiation produced by GSM mobile phones on the insulin release in rats. METHODS: Forty two female adult Sprague Dawley rats were randomly divided into 4 groups. Group1 were exposed to RF radiation 6 hours per day for 7 days. Group 2 received sham exposure (6 hours per day for 7 days)...
December 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28144592/calculation-of-thyroid-dose-with-planner-system-and-evaluation-of-thyroid-function-after-radiotherapy-for-patients-with-breast-cancer
#7
M Dorri Giv, M H Bahreini Toosi, S M R Aghamiri, F Akbari, S Taeb
BACKGROUND: Much research has widely been conducted into thyroid hormones levels following radiotherapy for breast cancer. Consequently, in this study, we evaluated to relate the rate of thyroid hormones levels with the dose distribution among breast cancer patients. MATERIAL AND METHODS: Thirty patients were treated with 4-field breast cancer radiotherapy. The dose volume histograms, the volume percentage of the thyroid absorbing respectively 20, 30, 40 and 50 Gy were then estimated (V20, V30, V40 and V50) together with the individual average thyroid dose over the whole gland derived from their computed tomography-based treatment plans...
December 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28144591/calculation-of-thyroid-dose-with-planner-system-and-evaluation-of-thyroid-function-after-radiotherapy-for-patients-with-breast-cancer
#8
M Dorri Giv, M H Bahreini Toosi, S M R Aghamiri, F Akbari, S Taeb
BACKGROUND: Much research has widely been conducted into thyroid hormones levels following radiotherapy for breast cancer. Consequently, in this study, we evaluated to relate the rate of thyroid hormones levels with the dose distribution among breast cancer patients. MATERIAL AND METHODS: Thirty patients were treated with 4-field breast cancer radiotherapy. The dose volume histograms, the volume percentage of the thyroid absorbing respectively 20, 30, 40 and 50 Gy were then estimated (V20, V30, V40 and V50) together with the individual average thyroid dose over the whole gland derived from their computed tomography-based treatment plans...
December 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28144590/effects-of-hesperidin-as-a-radio-protector-on-apoptosis-in-rat-peripheral-blood-lymphocytes-after-gamma-radiation
#9
R Fardid, Zh Ghorbani, Gh Haddadi, A Behzad-Behbahani, R Arabsolghar, E Kazemi, M A Okhovat, S J Hosseinimehr
INTRODUCTION: Hesperidin (HES), as the most abundant flavonoid existing in the citrus, is widely used by human daily. The radio-protective effects of Hesperidin have been confirmed in various measurement systems. This study aimed to evaluate the effects of Hesperidin on the changes in the apoptosis level and expression of apoptotic genes target (bax, bcl-2 and ration of bax/bcl-2) in the peripheral blood lymphocytes of male rats after gamma radiation. MATERIALS AND METHODS: 64 male rats were divided into eight groups: Control, HES (100 mg/kg b...
December 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28144589/estimation-of-photon-specific-absorbed-fractions-in-digimouse-voxel-phantom-using-monte-carlo-simulation-code-fluka
#10
A Sinha, H K Patni, B M Dixit, N K Painuly, N Singh
BACKGROUND: Most preclinical studies are carried out on mice. For internal dose assessment of a mouse, specific absorbed fraction (SAF) values play an important role. In most studies, SAF values are estimated using older standard human organ compositions and values for limited source target pairs. OBJECTIVE: SAF values for monoenergetic photons of energies 15, 50, 100, 500, 1000 and 4000 keV were evaluated for the Digimouse voxel phantom incorporated in Monte Carlo code FLUKA...
December 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/28144588/induction-of-neuroplasticity-by-transcranial-direct-current-stimulation
#11
EDITORIAL
A Mohammadi
No abstract text is available yet for this article.
December 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/27853728/development-of-radrob15-a-robot-for-detecting-radioactive-contamination-in-nuclear-medicine-departments
#12
A Shafe, S M J Mortazavi, A Joharnia, Gh H Safaeyan
Accidental or intentional release of radioactive materials into the living or working environment may cause radioactive contamination. In nuclear medicine departments, radioactive contamination is usually due to radionuclides which emit high energy gamma photons and particles. These radionuclides have a broad range of energies and penetration capabilities. Rapid detection of radioactive contamination is very important for efficient removing of the contamination without spreading the radionuclides. A quick scan of the contaminated area helps health physicists locate the contaminated area and assess the level of activity...
September 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/27853727/effects-of-low-intensity-continuous-ultrasound-on-hematological-parameters-of-rats
#13
M Mehrpour, A Shakeri-Zadeh, P Basir, B Jamei, H Ghaheri, M B Shiran
BACKGROUND: Low intensity ultrasound (US) has some well-known bio-effects which are of great importance to be considered. Objective: We conducted the present study to investigate the effects of low intensity continuous ultrasound on blood cells count in rat. METHODS: Rats were anesthetized and blood samples were collected before US exposure. Then, they were exposed to US with nominal intensity of 0.2 W/cm2 at frequency of 3 MHz for a period of 10 minutes and this protocol was repeated for 7 days...
September 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/27853726/effects-of-ultrasound-irradiation-on-the-release-profile-of-5-fluorouracil-from-magnetic-polylactic-co-glycolic-acid-nanocapsules
#14
Z Abed, J Beik, S Khoee, S Khoei, A Shakeri-Zadeh, M B Shiran
BACKGROUND: Drug nano-carriers are one of the most important tools for targeted cancer therapy so that undesired side effects of chemotherapy drugs are minimized. In this area, the use of ultrasound can be helpful in controlling drug release from nanoparticles to achieve higher treatment efficiency. OBJECTIVE: Here, we studies the effects of ultrasound irradiation on the release profile of 5-fluorouracil (5-Fu) loaded magnetic poly lactic co-glycolic acid (PLGA) nanocapsules...
September 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/27853725/a-study-on-performance-and-safety-tests-of-electrosurgical-equipment
#15
A Tavakoli Golpaygani, M M Movahedi, M Reza
INTRODUCTION: Modern medicine employs a wide variety of instruments with different physiological effects and measurements. Periodic verifications are routinely used in legal metrology for industrial measuring instruments. The correct operation of electrosurgical generators is essential to ensure patient's safety and management of the risks associated with the use of high and low frequency electrical currents on human body. MATERIAL AND METHODS: The metrological reliability of 20 electrosurgical equipment in six hospitals (3 private and 3 public) was evaluated in one of the provinces of Iran according to international and national standards...
September 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/27853724/evaluating-radioprotective-effect-of-hesperidin-on-acute-radiation-damage-in-the-lung-tissue-of-rats
#16
A Rezaeyan, R Fardid, G H Haddadi, M A Takhshid, M Hosseinzadeh, M Najafi, A Salajegheh
BACKGROUND: Oxidative stress plays an important role in the pathogenesis and progression of γ-irradiation-induced cellular damage, Lung is a radiosensitive organ and its damage is a dose-limiting factor in radiotherapy. The administration of dietary antioxidants has been suggested to protect against the succeeding tissue damage. The present study aimed to evaluate the radioprotective efficacy of Hesperidin (HES) against γ-irradiation-induced tissue damage in the lung of male rats. MATERIALS AND METHODS: Thirty two rats were divided into four groups...
September 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/27853723/evaluation-of-the-protective-role-of-vitamin-c-on-the-metabolic-and-enzymatic-activities-of-the-liver-in-the-male-rats-after-exposure-to-2-45-ghz-of-wi-fi-routers
#17
F Shekoohi-Shooli, S M J Mortazavi, M B Shojaei-Fard, S Nematollahi, M Tayebi
BACKGROUND: The use of devices emitted microwave radiation such as mobile phones, wireless fidelity (Wi-Fi) routers, etc. is increased rapidly. It has caused a great concern; the researchers should identify its effects on people's health. We evaluated the protective role of Vitamin C on the metabolic and enzymatic activities of the liver after exposure to Wi-Fi routers. MATERIAL AND METHODS: 70 male Wistar rats weighing 200-250 g were randomly divided into 7 groups (10 rats in each group)...
September 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/27853722/measurement-of-thyroid-dose-by-tld-arising-from-radiotherapy-of-breast-cancer-patients-from-supraclavicular-field
#18
B Farhood, M T Bahreyni Toossi, H Vosoughi, S Khademi, C Knaup
BACKGROUND: Breast cancer is the most frequently diagnosed cancer and the leading global cause of cancer death among women worldwide. Radiotherapy plays a significant role in treatment of breast cancer and reduces locoregional recurrence and eventually improves survival. The treatment fields applied for breast cancer treatment include: tangential, axillary, supraclavicular and internal mammary fields. OBJECTIVE: In the present study, due to the presence of sensitive organ such as thyroid inside the supraclavicular field, thyroid dose and its effective factors were investigated...
September 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/27853721/look-different-effect-of-radiation-hormesis-on-the-survival-rate-of-immunosuppressed-mice
#19
M Alavi, S Taeb, M A Okhovat, M Atefi, F Negahdari
BACKGROUND: Hormesis is defined as the bio-positive response of something which is bio-negative in high doses. In the present study, the effect of radiation hormesis was evaluated on the survival rate of immunosuppressed BALB/c mice by Cyclosporine A. MATERIAL AND METHODS: We used 75 consanguine, male, BALB/c mice in this experiment. The first group received Technetium-99m and the second group was placed on a sample radioactive soil of Ramsar region (800Bq) for 20 days...
September 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/27853720/performance-evaluation-of-algorithms-in-lung-imrt-a-comparison-of-monte-carlo-pencil-beam-superposition-fast-superposition-and-convolution-algorithms
#20
T Verma, N K Painuly, S P Mishra, M Shajahan, N Singh, M L B Bhatt, N Jamal, M C Pant
BACKGROUND: Inclusion of inhomogeneity corrections in intensity modulated small fields always makes conformal irradiation of lung tumor very complicated in accurate dose delivery. OBJECTIVE: In the present study, the performance of five algorithms via Monte Carlo, Pencil Beam, Convolution, Fast Superposition and Superposition were evaluated in lung cancer Intensity Modulated Radiotherapy planning. MATERIALS AND METHODS: Treatment plans for ten lung cancer patients previously planned on Monte Carlo algorithm were re-planned using same treatment planning indices (gantry angel, rank, power etc...
September 2016: Journal of Biomedical Physics & Engineering
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