Mashhad University of Medical Sciences
Iranian Journal of Medical Physics
2345-3672
14
1
2017
03
01
Quality Control Assessment of Conventional Radiology Devices in Iran
1
7
EN
Mohsen
Asadinezhad
0000-0001-6096-765X
Department of Radiology Technology, School of Paramedical Sciences, Mashhad University of Medical Sciences
asadinejad_m@yahoo.com
Mohammad Taghi
Bahreyni Toossi
0000-0002-3698-5716
Professor of Medical Physics, Mashhad University of Medical Sciences, Mashhad, Iran
bahreynimt@mums.ac.ir
Ali
Ebrahiminia
Assistant professor of medical physics, Biochemistry and Medical Physics Dept., School of Medicine, Guilan University of Medical Sciences, Rasht, Iran
ebrahiminia@gums.ac.ir
Masoumeh
Giahi
Student of Radiology Technology, Department of Radiology Technology, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
parmis.giahi@gmail.com
10.22038/ijmp.2017.19052.1173
<strong>Introduction</strong><br /> Quality control (QC) techniques are used in monitoring and maintenance of the components of an x-ray system. QC of radiology devices plays a significant role in reduction of medication dose and optimization of image quality. This study aimed to conduct QC tests on randomly selected radiology devices, installed in diagnostic imaging departments of Iran.<br /> <strong>Materials and Methods</strong><br /> In total, quality control tests were conducted on 51 conventional radiology devices installed in 20 cities of Iran in order to assess the accuracy of peak kilovoltage (kVp), exposure time, exposure linearity and reciprocity, reproducibility of exposure and determination of half-value layer (HVL) using a calibrated Mult-O-Meter.<br /> <strong>Results</strong><br /> In this study, 38.6% of devices had intolerable variance of kVp accuracy. The results of 34.5% of devices were out of the acceptable limits in exposure time accuracy test. In 46.7% and 53.1% of devices, variance was greater than the acceptable range for exposure linearity and exposure reciprocity, respectively. In terms of reproducibility of exposure test, the reproducibility variance and percentage of tube output variations in 19.4% of devices exceeded the limits. Moreover, the thickness of first HVL was lower than the acceptable limit in 14.7% of devices<strong>.</strong><br /> <strong>Conclusion</strong><br /> According to the results of this study, there were wide variations in QC test results, perhaps mainly due to the fact that it is not an obligation to implement QC programs in Iran. The most important problems were non-reciprocity of exposure, nonlinearity of exposure with milliampere-second (mAs), kVp and timer inaccuracy. Involvement of medical physicists, radiologists and radiographers in the implementation of QC programs at various stages of development, installation and use of equipment should enable the gradual improvement in equipment performance.
Quality Control,Diagnostic X-Ray,Radiology
https://ijmp.mums.ac.ir/article_8402.html
https://ijmp.mums.ac.ir/article_8402_38e0e6039ea22b76e83b188201be4a56.pdf
Mashhad University of Medical Sciences
Iranian Journal of Medical Physics
2345-3672
14
1
2017
03
01
Instrumental Neutron Activation Analysis of Trace Elements in Some Food Spices Consumed In Tehran, Iran
8
14
EN
ali asghar
fathivand
0000-0001-5056-2659
Radiation Applications Research School, Nuclear Science and Technology Research Institute
afathivand@aeoi.org.ir
sedigheh
kashian
0000-0003-0587-0120
Radiation Applications Research School, Nuclear Science and Technology Research Institute, Tehran, Iran.
skashian@aeoi.org.ir
Mahdi
Bathaei
Radiation Applications Research School, Nuclear Science and Technology Research Institute
mbathaei@aeoi.org.ir
10.22038/ijmp.2017.20537.1195
<strong>Introduction</strong><br /> There is a growing interest in determining the concentration of various elements in food spices. In the present study, the instrumental neutron activation analysis (INAA) was employed to measure the trace elements in 11 commonly food spices consumed in Tehran, Iran.<br /> <strong>Materials and Methods</strong><br /> The levels of K, Mn, Na, Cl, V, Br, Al, and As were determined and their effects on human health were discussed. The results were compared with the values reported in the literature. The accuracy and precision of the analytical procedure was estimated by analyzing the Lichen (IAEA-336) reference material.<br /> <strong>Results</strong><br /> The concentrations of the measured elements in the spices were 3850-29157, 10-335, 153-2849, 186-3063, 0.2-2.8, 2.1-58.7, and 72-2102 ppm for K, Mn, Na, Cl, V, Br, and Al, respectively. As was only detected in thyme (0.8 ppm) and plantain (0.42 ppm).<br /> <strong>Conclusion</strong><br /> As the findings of the present study indicated, the concentrations of K and Na in the black pepper, garlic, and ginger were significantly higher than the values reported in other countries. The Mn levels in the black pepper and garlic consumed in Tehran were comparable with those in Poland. Furthermore, the concentration of As in these spices were lower than the maximum permissible limit.
Element,Neutron Activation Analysis,Spices,Toxic
https://ijmp.mums.ac.ir/article_8462.html
https://ijmp.mums.ac.ir/article_8462_3024e1e0aa80ad6bdaf793d79833cf3d.pdf
Mashhad University of Medical Sciences
Iranian Journal of Medical Physics
2345-3672
14
1
2017
03
01
Numerical Study for Optimizing Parameters of High-Intensity Focused Ultrasound-Induced Thermal Field during Liver Tumor Ablation: HIFU Simulator
15
22
EN
Somayeh
gharloghi
Department ofMedical Physics & Biomedical Engineering, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran
s.gharloghi@yahoo.com
Mehrdad
Gholami
0000-0002-7544-6416
Department of Medical Physics, Lorestan University of Medical Sciences, Khorramabad, Iran
mhrgh@yahoo.com
Abbas
Haghparast
Department of Medical Physics & Biomedical Engineering, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran
a.haghparast@kums.ac.ir
Vahab
Dehlaghi
Department of Medical Physics & Biomedical Engineering, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran
dr.dehlaqi@yahoo.com
10.22038/ijmp.2017.19268.1176
<strong>Introduction</strong><br /> High intensity focused ultrasound (HIFU) is considered a noninvasive and effective technique for tumor ablation. Frequency and acoustic power are the most effective parameters for temperature distribution and the extent of tissue damage. The aim of this study was to optimize the operating transducer parameters such as frequency and input power in order to acquire suitable temperature and thermal dose distribution in the course of a numerical assessment.<br /> <strong>Materials and Methods</strong><br /> To model the sound propagation, the Khokhlov-Zabolotskava-Kuznetsov (KZK) nonlinear wave equation was used and simulation was carried out using MATLAB HIFU toolbox. Bioheat equation was applied to calculate the transient temperature in the liver tissue. Frequency ranges of 2, 3, 4, and 5 MHz and power levels of 50 and 100 W were applied using an extracorporeal transducer.<br /> <strong>Results</strong><br /> Using a frequency of 2 MHz, the maximum temperatures reached 53°C and 90°C in the focal point for power levels of 50 W and 100 W, respectively. With the same powers and using a frequency of 3 MHz, the temperature reached to 71°C and 170°C, respectively. In addition, for these power levels at the frequency of 4 MHz, the temperature reached to 72°C and 145°C, respectively. However, at the 5 MHz frequency, the temperature in the focal spot was either 57°C or 79°C.<br /> <strong>Conclusion</strong><br /> Use of frequency of 2 MHz and power of 100 W led to higher thermal dose distribution, and subsequently, reduction of the treatment duration and complications at the same exposure time in ablation of large tumors.<br /><br />
High-Intensity Focused Ultrasound Ablation,Nonlinearity KZK Equation,optimization,Thermal Dose
https://ijmp.mums.ac.ir/article_8463.html
https://ijmp.mums.ac.ir/article_8463_d803b6c06cbc7c1e9f8e4ad3ce14b415.pdf
Mashhad University of Medical Sciences
Iranian Journal of Medical Physics
2345-3672
14
1
2017
03
01
Health Risk Assessment of Natural Background Radiation in Residents of Khorramabad, Iran
23
28
EN
Mojtaba
Ghorbanipour
Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
ghorbanipoor4949@gmail.com
Azamalsadat
Hosseini Alhashemi
Department of Environmental Sciences, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
azamhosseini.srb@gmail.com
Somayeh
Gharloghi
Department of Medical Physics, Lorestan University of Medical Sciences, Khorramabad, Iran
s.gharloghi@yahoo.com
Mahin
Adeli
Department of Public Health, Lorestan University of Medical Sciences, Khorramabad, Iran
ma.adeli2010@gmail.con
Mehrdad
Gholami
0000-0002-7544-6416
Department of Medical Physics, Lorestan University of Medical Sciences, Khorramabad, Iran
mhrgh@yahoo.com
10.22038/ijmp.2017.19683.1184
<strong>Introduction</strong><br /> Radioactive materials naturally exist in the world<strong>. </strong>Indeed, approximately 82% of human-absorbed radiation doses, which are out of human control, arise from natural sources of radiation including cosmic, terrestrial, and exposure through inhalation or ingestion. Thus, the aim of the present study was to estimate health risk, as well as the effective and organ doses from naturally occurring background radiation in residents living in the vicinity of Khorramabad, Iran.<br /> <strong>Materials and Methods</strong><br /> This cross-sectional study was carried out in Khorramabad, Iran. The measurements were performed using Geiger-Muller detector (RDS-110) during daylight from April to June, 2015. The natural gamma radiation measurements were made both indoor and outdoor across five regions of Khorramabad (north, south, west, east, and center).<br /> <strong>Results</strong><br /> The estimated mean absorbed dose rate in outdoor and indoor zones were 0.09±0.024 and 0.117±0.032 mSvy<sup>-1</sup>, respectively. Additionally, the mean annual effective dose was calculated as 0.69±0.19 mSvy<sup>-1</sup>, while the estimated health risk probability was 0.0345%.<br /> <strong>Conclusion</strong><br /> The average annual effective dose arising from gamma background radiation was higher than global values. Therefore, more studies are required to examine the relationship between radiation-induced effects and the natural background radiation level in Khorramabad.<br /><br />
Effective Dose,Health Risk Assessment,Gamma,Radiation Measurement
https://ijmp.mums.ac.ir/article_8405.html
https://ijmp.mums.ac.ir/article_8405_2b996acd45bdc199b4da4908726aaa9e.pdf
Mashhad University of Medical Sciences
Iranian Journal of Medical Physics
2345-3672
14
1
2017
03
01
Molecular Effects of Atmospheric Pressure Plasma Jet on the Double-Stranded DNA
29
37
EN
Abasalt
Hosseinzadeh Colagar
Department of Molecular and Cell Biology, Faculty of Basic Sciences, University of Mazandaran
ahcolagar@umz.ac.ir
Seyed Mohsen
Mortazavi
Department of Molecular and Cell Biology, Faculty of Basic Sciences, University of Mazandaran
st_mohsen@yahoo.com
Vahid
Arab-Yarmohammadi
Department of Molecular and Cell Biology, Faculty of Basic Sciences, University of Mazandaran
vaym2011@gmail.com
Farshad
Sohbatzadeh
Department of Atomic and Molecular Physics, Faculty of Basic Sciences, University of Mazandaran
f.sohbat@umz.ac.ir
10.22038/ijmp.2017.20020.1189
<strong>Introduction</strong><br /> The aim of this study was toinvestigate the sterilization potential of atmospheric pressure plasma jet (APPJ) and interactions of this technology with double-stranded DNA using the polymerase chain reaction (PCR) and single-strand conformation polymorphism (SSCP) techniques.<br /> <strong>Materials and Methods</strong><br /> The plasma jet was produced through a high voltage sinusoidal power supplyusing a mixture of argon and oxygen gases with theflow rate of 1 L/min. <em>Escherichia coli</em> cells and double-stranded DNA (dsDNA) fragments were amplified by <em>T7</em> universal primer through the PCR technique and treated with argon/oxygen APPJ at different exposure times. The data were analyzed by the agarose and polyacrylamide gel electrophoresis, SSCP and renewed PCR techniques.<br /> <strong>Results</strong><br /> According to the results of the study, the APPJ could serve as an effective instrument for sterilization at > 30 sec discharge. The destruction of DNA was detectable by different techniques after 120 sec from APPJ discharge.<br /> <strong>Conclusion</strong><br /> Our findings revealed that the active species of plasma can lead to cell death. These species may break or nick the dsDNA, exchange DNA nucleotides, and lead to transition and transversion mutations. These mutagenesis effects of APPJ might be the reason of microorganism cell death after the treatment in addition to other destructive effects of APPJ on macromolecules. <br /><br />
APPJ,Single Strand Break,Double Strand Break,Atmospheric Pressure,DNA
https://ijmp.mums.ac.ir/article_8461.html
https://ijmp.mums.ac.ir/article_8461_55bba5a3ad11000fcec2e03753e8c80d.pdf
Mashhad University of Medical Sciences
Iranian Journal of Medical Physics
2345-3672
14
1
2017
03
01
Assessment of Radiation Exposure Levels and Associated Health Risks in Calabar Free Trade Zone, Nigeria
38
46
EN
Samuel
O.
Inyang
0000-0002-0054-381X
University of Calabar, Calabar
Nigeria
inyangso@yahoo.com
Imeh
E.
Essien
Department of Physics
University of Uyo
Uyo, Akwa Ibom State
Nigeria
imeessien27@yahoo.com
Unyimeabasi
U.
Jeremiah
Department of Physics
University of Calabar
Calabar, Cross River State
Nigeria
ppacanopy@yahoo.com
10.22038/ijmp.2016.19523.1182
<strong>Introduction</strong><br /> Exposure to chronic levels of ionizing radiation could be detrimental to health even at very low doses. Calabar free trade zone (CFTZ) was established to promote export business in Nigeria and it is yet to produce exposure data of the Zone.<br /> <strong>Materials and Methods</strong><br /> The Zone was divided into three categories depending on the type of business. Category A had facilities with manufacturing businesses, Category B was service providers while Category C was oil and gas businesses. Exposure levels within the CFTZ were measured with exposure meter and results obtained were converted to annual effective dose in mSv/yr. The evaluated doses were used to estimate health risks to workers in the Zone in terms of lifetime cancer incidence and mortality for persons aged between 18 – 65 years using the conversion factors in BEIR VII.<br /> <strong>Results</strong><br /> Category B facilities had dose values between 0.21 – 0.31 mSv/yr followed by Category A with dose values between 0.23 – 0.35 mSv/yr. Category C facilities had the highest dose values between 0.33 – 0.40 mSv/yr. The evaluated cancer incidence and mortality rates were generally less than 2 persons in 1,000 persons for both male and female workers.<br /> <strong>Conclusion</strong><br /> The study shows that the exposure levels in business facilities within the CFTZ were higher than the background radiation level. The effective doses were not uniform for the different categories. The estimated cancer incidence and mortality were low, and simple linear equations were generated to relate cancer incidence to mortality.
Effective Dose,Health Risk,Cancer,Oil and Gas
https://ijmp.mums.ac.ir/article_8404.html
https://ijmp.mums.ac.ir/article_8404_c7eaf8def761e8e264bf9a421271b772.pdf
Mashhad University of Medical Sciences
Iranian Journal of Medical Physics
2345-3672
14
1
2017
03
01
Assessment of Radiographers’ Awareness about Radiation Protection Principles in Hospitals of Bandar Abbas, Iran
47
52
EN
Erfaneh
Kargar
Student Research Committee, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
erfaneh_kargar@yahoo.com
Wrya
Parwaie
Department of Radiology, Faculty of Para-Medicine, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
veryaparvaiy@yahoo.com
Bagher
Farhood
0000-0003-2290-7220
Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
bffarhood@gmail.com
Zahra
Atazadegan
Student Research Committee, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
werya.parwae@gmail.com
Mahdieh
Afkhami Ardekani
Department of Radiology, Faculty of Para-Medicine, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
werya.parwaie@gmail.com
10.22038/ijmp.2017.19574.1180
<strong>Introduction</strong><br /> This study was conducted to evaluate the radiographers’ awareness of radiation protection principles in the radiology centers of the hospitals of Bandar Abbas, Iran.<br /> <strong>Materials and Methods</strong><br /> This analytical cross-sectional study was conducted on 50 radiographers of three hospitals affiliated with Hormozgan University of Medical Sciences in 2015. The data were collected using a two-part questionnaire. The first part was related to the demographic information of the radiographers(i.e. age, gender, work experience, workplace, and passing related training courses). The second part consisted of questions related to the radiographers’ awareness in three fields of radiology physics, radiation protection, and hazards of radiation.<br /> <strong>Results</strong><br /> According to the results of the present study, the mean total scores of the radiographers’ awareness about the radiology physics, radiation protection, and hazards of radiation was 18.41±1.14 out of 22. However, the radiographers’ awareness of the three investigated fields had no statistically significant relationships with the work experience (P=0.244) and gender (P=0.386). However, there was a significant relationship between the radiographers’ awareness about the radiation protection and their education level (P=0.034). Moreover, a significant association was found between the radiographers’ awareness and their workplace (P=0.009). Additionally, the participation in the radiation training courses was significantly correlated with the radiographers’ awareness regarding the radiation hazards (P=0.022).<br /> <strong>Conclusion</strong><br /> According to the findings of the present study, the awareness level of the radiographers about the radiation protection principles was relatively good. However, it seems that the education level of the staff should be enhanced through holding regular short-term radiation training courses. <br /><br />
Awareness,Radiation Protection,Radiation hazards,radiographers,Radiology
https://ijmp.mums.ac.ir/article_8465.html
https://ijmp.mums.ac.ir/article_8465_a410729aba6cf136ab8906299132874a.pdf
Mashhad University of Medical Sciences
Iranian Journal of Medical Physics
2345-3672
14
1
2017
03
01
Evaluation of Radio-Protective Effects of N-Acetylcysteine on Radiation-Induced Lethality in Mice
53
59
EN
ashkan
salajegheh
0000-0002-8153-3233
Department of Radiology, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
ashkan.salajegheh@gmail.com
mehdi
hoseini
Medical Physics Department, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
hoseini.mehdi98@gmail.com
Mina
Nouri
Department of Radiology, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
nmina81@yahoo.com
Rasool
Dehghani Soltani
Student Research Committee, Kerman University of Medical Sciences, Kerman- Iran
rasoold23@yahoo.com
Yaser
Masoumi-Ardakani
Physiology Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
ymab125@gmail.com
10.22038/ijmp.2016.13828.1119
<strong>Introduction</strong>
It has long been known that ionizing radiation can lead to detrimental effects in normal cells. In this light, Radioprotective chemicals have been used to decrease morbidity or mortality caused by ionizing irradiation. This study aimed to evaluate the radio-protective effect of N-acetylcysteineagainst radiation-induced mortality in male mice.
<strong>Materials and Methods</strong>
52 healthy male mice were divided into four groups including NAC before irradiation (1), irradiation (2), NAC after irradiation (3) NAC before irradiation (4) and control. Three groups were treated orally with 100 mg/ kg of NAC. Gamma irradiation was performed at 8 Gy using a Co-60 machine. Kaplan-Meier method and the log-rank test were performed, using SPSS version 16. The significance level was considered to be 0.05.
<strong>Results</strong>
The statistical analysis revealed a significant difference between the test and control groups (P<strong><</strong>0.05). The percentage of survival after 30 days was 46.2% for the irradiation group (1). In addition, the percentage of decreased lifespan was calculated at 5.90%, 23.60% and 17.93% for the first-third groups, respectively.
<strong>Conclusion</strong>
Results revealed lack of effectiveness of treatment with NAC after lethal dose. These results suggested that application of NAC for mice before irradiation protected them from the lethal effects of whole-body irradiation.
Gamma-Irradiation,Radioprotective,N-acetylcysteine,Radiation Sickness
https://ijmp.mums.ac.ir/article_8464.html
https://ijmp.mums.ac.ir/article_8464_f3b09f3ecfd66bc95e4c02111f6198ba.pdf