Iranian Journal of Medical Physics最新文献_第6页

Status and Trend of Occupational Radiation Exposure in Radiotherapy and Diagnostic X-ray Practices in Bangladesh 孟加拉国放射治疗和诊断x射线实践中职业辐射暴露的现状和趋势

Iranian Journal of Medical Physics Pub Date : 2020-10-26 DOI: 10.22038/IJMP.2020.51707.1850

S. Banik, S. Pervin, M. Siraz, A. Rahman, M. S. Rahman, S. Yeasmin

{"title":"Status and Trend of Occupational Radiation Exposure in Radiotherapy and Diagnostic X-ray Practices in Bangladesh","authors":"S. Banik, S. Pervin, M. Siraz, A. Rahman, M. S. Rahman, S. Yeasmin","doi":"10.22038/IJMP.2020.51707.1850","DOIUrl":"https://doi.org/10.22038/IJMP.2020.51707.1850","url":null,"abstract":"Introduction: The evaluation of occupational exposure and related trends due to external ionizing radiation in diagnostic and therapeutic purposes has become crucial to understand the implementation of regulatory acts and technological advancement. This study describes the status of occupational radiation exposure in radiotherapy (RADT) and diagnostic X-ray (DRA) sector and the comparison with related research.Materials and Methods: Overall, 12141 number of radiation workers were monitored using thermoluminescent dosimeters (TLDs) which read-out by Harshaw TLD Reader (Model 4500) on a quarterly basis. Several parameters such as annual collective effective dose, average annual effective dose, collective and individual dose distribution, and the probability of cancer risk were analyzed.Results: The number of monitored workers increased by around 35%, whereas the number of radiation workers received a measurable amount of doses decreased by around 37% during 2014-2018. The annual average effective doses in RADT and DRA were in the range of 0.017-0.1112 and 0.076-0.1702 mSv, respectively. The results indicate that more than 94% of the total collective dose was for the non-physician group. Among exposed radiation workers, almost 78% received doses below 1mSv and","PeriodicalId":14613,"journal":{"name":"Iranian Journal of Medical Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47865425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dosimetric comparison of collapsed cone convolution/superposition and anisotropic analytic algorithms in the presence of eXaSkin bolus in radiotherapy 放疗中eXaSkin丸存在时塌陷锥卷积/叠加和各向异性分析算法的剂量学比较

Iranian Journal of Medical Physics Pub Date : 2020-10-24 DOI: 10.22038/IJMP.2020.49078.1789

Leila Mohammadian, Mohsen Bakhshandeh, E. Saeedzadeh, A. J. Arfaee, R. Abedi-Firouzjah

{"title":"Dosimetric comparison of collapsed cone convolution/superposition and anisotropic analytic algorithms in the presence of eXaSkin bolus in radiotherapy","authors":"Leila Mohammadian, Mohsen Bakhshandeh, E. Saeedzadeh, A. J. Arfaee, R. Abedi-Firouzjah","doi":"10.22038/IJMP.2020.49078.1789","DOIUrl":"https://doi.org/10.22038/IJMP.2020.49078.1789","url":null,"abstract":"Introduction: Bolus type materials are needed in case of superficial lesions radiotherapy. This work determined the dosimetric accuracy of two commercial treatment planning systems (TPS) for the calculation of photon dose distribution in the presence of eXaSkin bolus.Material and methods: Dose calculations were performed on collapsed cone convolution/superposition (CCC) and anisotropic analytical algorithm (AAA) using computed tomography (CT) images of heterogeneous CIRS phantom. EBT3 film was used for obtaining percentage depth dose (PDD) curves and gamma index was utilized for comparing the accuracy of the two algorithms. The passing rate of global gamma index with the passing criterion of 3mm/3% as the standard criterion was considered 95% in this study. Results: Surface dose in PDD curves increased in the presence of 0.5 cm thick eXaSkin bolus. The passing rates of gamma index with standard passing criterion between AAA algorithm and EBT3 film measurements without and with bolus were 95% and 95.5%, respectively, while they were equal to 96% and 97.5% for CCC algorithm. Conclusion: There was a good agreement in dose calculation between AAA and CCC algorithms. Furthermore, eXaSkin bolus increased the surface dose by a factor of 25%.","PeriodicalId":14613,"journal":{"name":"Iranian Journal of Medical Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48461279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dosimetric Comparison of Optimized and Non-optimized Plans In Intracavitary Brachytherapy Using international Commission On Radiation Units and Measurements (ICRU) 89. 使用国际辐射单位和测量委员会（ICRU）对腔内近距离治疗中优化和非优化方案的剂量比较89。

Iranian Journal of Medical Physics Pub Date : 2020-10-12 DOI: 10.22038/IJMP.2020.47653.1764

Nidhi Marjara, A. Bansal, D. Tripathi

{"title":"Dosimetric Comparison of Optimized and Non-optimized Plans In Intracavitary Brachytherapy Using international Commission On Radiation Units and Measurements (ICRU) 89.","authors":"Nidhi Marjara, A. Bansal, D. Tripathi","doi":"10.22038/IJMP.2020.47653.1764","DOIUrl":"https://doi.org/10.22038/IJMP.2020.47653.1764","url":null,"abstract":"IntroductionThe study aimed at evaluating the effect on the target coverage and dosimetric parameters of organs-at-risks (OARs) in optimized plans as compared to non-optimized plans normalized at point A.Materials and MethodsIt is a retrospective study of 21 cervical cancer patients of stage II and stage III who underwent high dose rate (HDR) intracavitary brachytherapy (ICBT) following external beam radiotherapy. For the study, two treatment plans were created for each application using computed tomography (CT) images. The non-optimized plans were normalized at point A and the other plans were optimized in such a way that 90% volume of HR-CTV should receive the prescription dose. Dose volume histograms were used to compare D5cc, D2cc, D1cc, and D0.1cc (minimum doses received by 5cc, 2cc, 1cc and 0.1cc most irradiated volumes, respectively) for organs-at-risks (OARs) namely bladder, rectum, sigmoid and small bowel, and D90% ,D50% , D98%,D100% ,D95% coverage of HR-CTV between non-optimized and optimized plans. RESULTS HR-CTV coverage was improved for 80% of the patients and bladder and rectum dose was reduced by 9.85% and 8.75% respectively in optimized plans as compared to the non-optimized plans normalized at point A. Reduction of about 8.95% and 9.75% in sigmoid and bowel doses respectively in optimized plans was observed.CONCLUSION Optimized plans resulted in better OARs sparing and satisfactory target coverage as compared to non-optimized plan normalized at point A.KEYWORDS: ICRU 89, HR-CTV, Dosimetric comparison , Brachytherapy , Optimized plans, Non-optimized plans.","PeriodicalId":14613,"journal":{"name":"Iranian Journal of Medical Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46976667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of Metal Artifact Reduction software in Computed Tomography 计算机断层扫描中金属伪影还原软件的评价

Iranian Journal of Medical Physics Pub Date : 2020-09-01 DOI: 10.22038/IJMP.2019.42734.1638

Eslam Maamoun, M. Aziz

{"title":"Evaluation of Metal Artifact Reduction software in Computed Tomography","authors":"Eslam Maamoun, M. Aziz","doi":"10.22038/IJMP.2019.42734.1638","DOIUrl":"https://doi.org/10.22038/IJMP.2019.42734.1638","url":null,"abstract":"Introduction: The image quality of computed tomography (CT) can be seriously lowered by metal implants of patients. These implants are known to exert a significant impact on diagnostic accuracy due to artifacts. The current study aimed to assess the usefulness of Metal Artifact Reduction (MAR) software in the reduction of metal artifacts, in comparison to iterative reconstruction algorithm (IDREAM). Material and Methods: Water phantom with raw chicken leg underwent CT scan (Sinovision, Insitum 16) before (reference group (GPref) and after metal implantation: ((GPA (IDREAM without MAR) and GPB(IDREAM with MAR)). A total number of 30 patients [GP1 (instrumented spine (n=15)), GP2 (Brain clips (n=15))] underwent CT scan (Sinovision ,Insitum 16). GP1 and GP2 were reconstructed using two procedures including IDREAM without MAR vs. 2: IDREAM with MAR. All images were evaluated using subjective and quantitative assessment. Results: In subjective image quality assessment, the scores of MAR images were higher than IDREAM images (P<0.05) as indicated by four radiologists. The absolute CT difference (ΔCT) and Artifact index (AI) demonstrated that MAR appeared to be superior for the reduction of metal artifacts (P<0.05). Conclusion: As evidenced by the obtained results, MAR software can be efficiently used for metal artifact reduction in computed tomography (instrumental spine and brain clips).","PeriodicalId":14613,"journal":{"name":"Iranian Journal of Medical Physics","volume":"17 1","pages":"298-302"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44215386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of Six-Dimensional Cranial Target Positioning Accuracy in Two Different Immobilization Methods Using Exactrac System 基于Exactrac系统的两种不同固定方法对六维颅骨目标定位精度的评价

Iranian Journal of Medical Physics Pub Date : 2020-09-01 DOI: 10.22038/IJMP.2019.35652.1448

T. Kasirajan, P. Ganesan, R. Kesavan, N. ArunaiNambiRaj, K. Senthilnathan, P. Rameshbabu

{"title":"Evaluation of Six-Dimensional Cranial Target Positioning Accuracy in Two Different Immobilization Methods Using Exactrac System","authors":"T. Kasirajan, P. Ganesan, R. Kesavan, N. ArunaiNambiRaj, K. Senthilnathan, P. Rameshbabu","doi":"10.22038/IJMP.2019.35652.1448","DOIUrl":"https://doi.org/10.22038/IJMP.2019.35652.1448","url":null,"abstract":"Introduction: The aim of this study was to determine the accuracy of two different immobilization methods in patient positioning in cranial radiotherapy. The six-dimensional (6D) target localization accuracy of using a dedicated stereotactic mask was compared with that of a conventional head mask by the ExacTrac system. \u0000Material and Methods: A total of 56 patients with cranial lesions were included in this study (26 patients with a dedicated stereotactic mask and 30 subjects with a conventional head mask). The ExacTrac image-guided positioning system was utilized to obtain daily translational and rotational patient positioning displacement from the intended position. The 6D setup data was analyzed to obtain population mean, systematic and random errors, and three-dimensional (3D) vector shifts in all the patients. \u0000Results: The population mean values of setup errors were comparable with both immobilization systems; however, the spread as indicated by population systematic and population random errors was more in the use of a conventional head mask. The mean values of the 3D vector shifts were 2.09±1.00 and 4.51±3.38 mm with the use of a dedicated stereotactic mask and conventional head mask, respectively. The frequency distribution of maximum rotational deviation and statistical analysis demonstrated a significant difference in immobilization accuracy between stereotactic immobilization and 3-clamp immobilization (P<0.05). \u0000Conclusion: The results revealed that there was a significant reduction in target positioning errors with a dedicated stereotactic mask, compared to that with a conventional cranial mask. Furthermore, a dedicated stereotactic mask is required to keep rotational deviations within system correctable limits.","PeriodicalId":14613,"journal":{"name":"Iranian Journal of Medical Physics","volume":"17 1","pages":"308-315"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44831753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transfer of Radio-Adaptation via Serum: A Preliminary Report 通过血清转移无线电适应:初步报告

Iranian Journal of Medical Physics Pub Date : 2020-09-01 DOI: 10.22038/IJMP.2019.39821.1532

Ehsan Khodamoradi, R. Azmoonfar, M. Mohammadi, A. Kiani, A. Haghparast, N. Sharafi, Loghman Diojan

{"title":"Transfer of Radio-Adaptation via Serum: A Preliminary Report","authors":"Ehsan Khodamoradi, R. Azmoonfar, M. Mohammadi, A. Kiani, A. Haghparast, N. Sharafi, Loghman Diojan","doi":"10.22038/IJMP.2019.39821.1532","DOIUrl":"https://doi.org/10.22038/IJMP.2019.39821.1532","url":null,"abstract":"Introduction: Adaptive response is one of the important concepts in radiobiology. The present report aimed to transfer the radio-adaptation via serum. \u0000Material and Methods: In total, 50 male adult Wistar rats were randomly divided into 6 groups, including control, serum control, low-dose (100cGy), low-dose/lethal, serum/lethal, and lethal (8Gy). Exposure was carried out by a linear accelerator (Elekta Synergy® Platform) with a 40×40cm field size. The animals were monitored in terms of the endpoints of the survival rate, and at the first stage, the rats were exposed to the low doses of radiation. Subsequently, the serum was injected intraperitoneally under sterile conditions 6 h after low-dose exposure. The Kaplan Meier Survival Curve was used to evaluate the survival rate (P<0.05). \u0000Results: There was a significant difference among different groups regarding the survival rates. Moreover, a statistically significant difference was observed between low-dose/lethal and low-dose/serum, low-dose/lethal and lethal, and low-dose/serum and lethal (P=0.001). Similarly, there was a statistically significant difference between the control and experimental groups regarding the survival rates (P=0.001). \u0000Conclusion: To the best of our knowledge, this method can lead to immunological responses or unknown mechanisms that result in the increased survival adaptive response to subsequent high-dose radiation.","PeriodicalId":14613,"journal":{"name":"Iranian Journal of Medical Physics","volume":"17 1","pages":"316-321"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46572761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Concentration Measurement of 12 Elements in Five Herbal Plants Using Neutron Activation Analysis Approach 用中子活化分析法测定5种中草药中12种元素的浓度

Iranian Journal of Medical Physics Pub Date : 2020-09-01 DOI: 10.22038/IJMP.2019.42258.1621

S. Kashian, A. Fathivand, R. Pourimani

{"title":"Concentration Measurement of 12 Elements in Five Herbal Plants Using Neutron Activation Analysis Approach","authors":"S. Kashian, A. Fathivand, R. Pourimani","doi":"10.22038/IJMP.2019.42258.1621","DOIUrl":"https://doi.org/10.22038/IJMP.2019.42258.1621","url":null,"abstract":"Introduction: Nowadays, many people use medicinal plants to manage diseases; therefore, detailed knowledge of the type and level of elements present in these plants is of prominent importance.The present study aimed to determine the weight fraction of 12 elements in the five most common medicinal plants in Iran. The names of these plants are caraway (Carum carvi), savory (Satureja hortensis), purslane (Portulaca oleracea), fenugreek (Trigonella foenum-graecum), and milk thistle (Silybum marianum) which were purchased from herbal pharmacies. Material and Methods: The neutron activation method was used to determine the elements. In the current study, neutrons from the research reactor core in Tehran, Iran were used and gamma spectra from radionuclides were recorded using a high purity germanium detector. The mass fractions of 12 elements were determined in the five abovementioned plants. Results: Caraway had the maximum amounts of elements of Fe (8,789 ppm), Cr (8 ppm), and Na (517 ppm) among the selected plants. The savory contained maximum levels of Mn (95 ppm), Cl (3,702 ppm), Ca (18,328 ppm), K (21,562 ppm), and V (2.7 ppm) and the lowest amount of Fe (195 ppm), Zn (13 ppm), Ca (2,243 ppm), Al (99ppm), Mn (26 ppm), and Mg (177ppm) were observed in fenugreek. Conclusion: The highest levels of Cr and Mg were obtained for caraway (8 ppm) and pursalne (3,915 ppm), respectively. These elements can help to decrease blood cholesterol and triglyceride levels. Furthermore, the results showed that these herbs were rich in essential nutrients for metabolic functions.","PeriodicalId":14613,"journal":{"name":"Iranian Journal of Medical Physics","volume":"17 1","pages":"303-307"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47295041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Effect of Phantom Size and Tube Voltage on the Size-Conversion Factor for Patient Dose Estimation in Computed Tomography Examinations 体模尺寸和管电压对计算机断层扫描中患者剂量估计的尺寸转换因子的影响

Iranian Journal of Medical Physics Pub Date : 2020-09-01 DOI: 10.22038/IJMP.2019.43059.1649

Dwi Adhianto, C. Anam, H. Sutanto, Mohd Hanafi Ali

{"title":"Effect of Phantom Size and Tube Voltage on the Size-Conversion Factor for Patient Dose Estimation in Computed Tomography Examinations","authors":"Dwi Adhianto, C. Anam, H. Sutanto, Mohd Hanafi Ali","doi":"10.22038/IJMP.2019.43059.1649","DOIUrl":"https://doi.org/10.22038/IJMP.2019.43059.1649","url":null,"abstract":"Introduction: This study aimed to establish the conversion factors to normalize the output dose of volumetric computed tomography dose index (CTDIvol) to the patient dose (i.e. size-specific dose estimate (SSDE)) for various phantom diameters and tube voltages. \u0000Material and Methods: In-house cylindrical acrylic phantoms with physical diameters ranging from 8 to 40 cm were developed in this study. Each phantom had a hole in the center and four holes in the peripheral areas. The phantoms were scanned by a Siemens Somatom Definition AS CT Scanner using different tube voltages (i.e. 80, 100, 120, and 140 kVps) and with 200 mAs and 10 mm slice thickness. In addition, the doses in every hole and phantom were measured using a Raysafe X2 CT Sensor. The weighted SSDE (SSDEw) values were calculated using the five holes in every measurement. The size-conversion factors for the body and the head CTDI phantoms were established by dividing the SSDEw for various sizes with the SSDEw at the water-equivalent diameter of 33.90 cm and 16.95 cm, respectively. \u0000Results: The results revealed that the size-conversion factor exponentially decreased with an increase in the phantom size. It was also found that the size-conversion factor was affected by the tube voltages. Furthermore, the different size-conversion factor between 80 and 140 kVp was more than 15% in very thin and obese patients. \u0000Conclusion: Higher accuracy of the size-specific dose estimation can be achieved considering the impact of the tube voltages beside the size of the patient.","PeriodicalId":14613,"journal":{"name":"Iranian Journal of Medical Physics","volume":"17 1","pages":"282-288"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48870198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Radiometric Assessment of Farm Soils and Food Crops Grown in Kuru-Jos, Nigeria 尼日利亚库鲁乔斯农场土壤和粮食作物的辐射评估

Iranian Journal of Medical Physics Pub Date : 2020-09-01 DOI: 10.22038/IJMP.2019.42643.1633

S. K. Alausa

{"title":"Radiometric Assessment of Farm Soils and Food Crops Grown in Kuru-Jos, Nigeria","authors":"S. K. Alausa","doi":"10.22038/IJMP.2019.42643.1633","DOIUrl":"https://doi.org/10.22038/IJMP.2019.42643.1633","url":null,"abstract":"Introduction: Human activities, such as mining, result in the elevation of natural ionizing radiation in the environment. Jos-Plateau, Nigeria, including Kuru-Jos has experienced commercial tin mining in the past, and local mining is still being practiced in this area. Therefore, it is important to assess the radiation exposure due to grown crops and the farm soils in Kuru-Jos, Nigeria. Material and Methods: In total, four crops and soil samples were randomly collected from farmlands in Kuru-Jos. The radioactivity levels in the soil and food samples were measured using a thallium-activated sodium-iodide detector coupled to a Canberra series 10 plus Multi-Channel Analyzer. The effective dose rates in soils and food crops along with the cancer risks in the crops were determined. Results: According to the results, the highest mean activity concentrations of 40K, 226Ra, and 232Th in the food crops were 456±126.0Bq/Kg (yam), 46.9±9.6Bq/kg (yam), and 31.6±23.9Bq/Kg (maize), respectively. Moreover, the mean activity concentrations of 40K, 226Ra, and 232Th in farm soil were determined at 1105.6±357.7Bq/Kg (cassava), 167.5±37.6Bq/Kg (yam), and 205.4±124.4Bq/Kg (Guinea corn), respectively. Additionally, yam crop had the highest mean ingestion effective dose of 1231.9µSv/y, and maize crop indicated the minimum mean value of 304.1±179.1µSv/y. The cancer risks of and for yam and cassava, respectively, were higher than the world average value (i.e., 1.0x10-3). Conclusion: The results indicated a high radioactivity level which is in line with the results obtained from other areas in Jos-Plateau, Nigeria; however, there have been no radiological health plague reports from the areas so far.","PeriodicalId":14613,"journal":{"name":"Iranian Journal of Medical Physics","volume":"17 1","pages":"289-297"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42013289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Optimization of Radiation Dose in Cranial Computed Tomography among Adults: Assessment of Radiation Dose against Image Quality 成人头颅计算机断层扫描辐射剂量的优化:辐射剂量对图像质量的评估

Iranian Journal of Medical Physics Pub Date : 2020-09-01 DOI: 10.22038/IJMP.2019.40477.1565

N. Okoro, V. Changizi, E. Jazayeri, F. Pak

{"title":"Optimization of Radiation Dose in Cranial Computed Tomography among Adults: Assessment of Radiation Dose against Image Quality","authors":"N. Okoro, V. Changizi, E. Jazayeri, F. Pak","doi":"10.22038/IJMP.2019.40477.1565","DOIUrl":"https://doi.org/10.22038/IJMP.2019.40477.1565","url":null,"abstract":"Introduction: The rapid use of computed tomography (CT) scan is of great concern, due to increase in patients’ dose. Optimization of CT protocol is a vital issue in dose reduction. This study aimed to optimize radiation dose in cranial CT and assess modifications in image quality under radiation dose reduction. \u0000Material and Methods: A poly(methyl methacrylate) phantom was used for quality control test on CT scanners. Data of 214 scan parameters, dose indicators; volume CT dose index (CTDIvol) and dose-length product (DLP) of patients who underwent cranial CT scans were collected. The data were grouped into three, with respect to the slice numbers of 24, 28, and 32. Tube voltage (kVp) and slice thickness were constant; (110 kVp and 4.8 mm, respectively), at variable tube currents (mAs). A one-sample t-test was used to compare the dose indicator values of the hospital protocol with a recommended protocol. Scan parameters were optimized for radiation dose against image quality. \u0000Results: Increased mAs resulted in increased CTDIvol and DLP at constant kVp and slice thickness. Moreover, dose indicators recorded the lowest and highest values at the slice numbers of 24 and 32, respectively. An increase in slice numbers affected dose indicators. Dose indicators recorded significant reduction (P<0.001) in comparison to the recommended protocol. \u0000Conclusion: Optimization of CT protocol considers radiation dose and image quality. Radiologists adopted protocols acquired with lower scan parameters and dose indicators lower than the recommended achievable dose limit of 58 mGy.","PeriodicalId":14613,"journal":{"name":"Iranian Journal of Medical Physics","volume":"17 1","pages":"322-330"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45220491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0