scholarly journals Estimation of effective dose from CT scanning using dose length product in a Nepalese hospital

2020 ◽  
Vol 6 (1) ◽  
pp. 56-63
Author(s):  
Pooja Shah
Keyword(s):  
Ct Scan ◽  
Effective Dose ◽  
Ct Scanning ◽  
Reference Level ◽  
Radiation Doses ◽  
Reference Levels ◽  
Contrast Imaging ◽  
Dose Length Product ◽  
Effective Doses ◽  
The Mean

Keywords: Effective dose, Dose Length Product, Computed Tomography Dose Indexvolume, Dose Reference Level AbstractAim: The aim of this study was to estimate the effective doses from CT scans using DoseLength Product (DLP) in a Nepalese hospital.Materials and methods: This prospective study was conducted in 150 patients above 18years of age who were referred for CT scan of head, chest and abdomen. The CT scan wasperformed on a 128 slice multi detector scanner. All the subjects who met the inclusioncriteria were included in the study. Following the non-contrast imaging phases of the head,chest and abdomen CTDIvol, DLP, kVp and pitch were recorded for each patient from theconsole display of the scanner. The effective dose was calculated for each examination usingDLP which were graphically analyzed and correlated with the age of the patient.Results: The study showed the mean CTDIvol for head, chest and abdomen to be 53.95±4.83mGy, 5.28±1.17 mGy and 11.15±2.71 mGy respectively along with mean DLP to be923.52±71.11 mGycm, 229.32±48.70 mGycm and 517.02±148.32 mGycm respectively. Usingthese values, the mean effective doses were calculated and found to be 1.93±0.14 mSv,3.20±0.68 mSv and 7.75±2.19 mSv respectively.Conclusion: The calculated effective dose values were lower than in other studies for CTexaminations of chest and abdomen while higher or similar for CT examination of head. Theresults of this survey could motivate other researchers to investigate the radiation doses inother hospitals and help establish national diagnostic reference levels.  

scholarly journals Pengaruh Parameter Milliampere-Second (mAs) terhadap Kualitas Citra Dan Dosis Radiasi Pada Pemeriksaan CT scan Kepala Pediatrik

2020 ◽  
Vol 17 (1) ◽  
pp. 1 ◽  
Author(s):  
Muhammad Irsal ◽  
Guntur Winarno
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Linear Regression ◽  
Ct Scan ◽  
Linear Regression Analysis ◽  
Mean Value ◽  
Reference Level ◽  
Radiation Doses ◽  
Average Value ◽  
The Mean

Radiographers are responsible for administering radiation doses according to the principle of As Low As Reasonably Achievable (ALARA), to optimize the use of CT parameters to produce good image quality by minimizing radiation doses. The purpose of this study was to determine the effect of mAs parameters on image quality and radiation dose received by pediatric CT head examination patients. The research method to perform image processing results of examination using radiant viewer and analysis of value Contrast to noise ratio (CNR) as a parameter of image quality and CTDIvol to determine the estimated radiation dose, then an analysis is performed to determine whether there is an influence of mAs on the CNR and CTDIvol values. The mean value of kV 116 ± 8.28, the mean value of parameter mAs 161.5 ± 63.46, the mean SNR parameter value is 7.5 ± 0.8, the mean return value of CNR parameter was 0.318 ± 0.291, the mean value of the CTDIvol parameter is 18.68 mGy ± 4.55 mGy, the average value of DLP parameters was 408.7 mGy x cm ± 105.2 mGy x cm, the mean value of parameter DLP is 441.2 mGy x cm ± 155.2 mGy x cm. With linear regression analysis of test results between mAs to CNR is R2 = 0.045. then to the results of linear regression between mAs against CTDI is R2 = 0704, the estimated radiation dose limit for the average value of CTDIvol 18.68 mGy and the average value of DLP 408.7 mGy x cm, this means the protocol CT scan of the head of the pediatric use is still within safe limits by Diagnostic Reference Level of BAPETEN in 2018 to pediatric head CT examination

Assessment of Annual Tracheobronchial Effective Dose from Indoor Radon Inhalation in Selected Residential Buildings in Southwestern Nigeria

2021 ◽  
Vol 11 (6) ◽  
pp. 79-88
Author(s):  
Olukunle Olaonipekun Oladapo ◽  
Olatunde Micheal Oni ◽  
Emmanuel Abiodun Oni
Keyword(s):  
Effective Dose ◽  
Radon Concentration ◽  
Residential Buildings ◽  
Indoor Radon ◽  
World Health ◽  
Reference Level ◽  
Indoor Radon Concentration ◽  
Effective Doses ◽  
The Mean ◽  
Radon Inhalation

Background and Purpose: Radon-222 is a major human health challenge among all sources of ionizing radiation. For most people, the greatest exposure to radon comes from homes and affects mainly the respiratory tract, especially the tracheobronchial region. This work assesses the annual tracheobronchial effective dose from indoor radon inhalation in residential buildings with different covering materials for walls, ceilings and floor using different dosimetric lung models. Method: A total of 180 residential buildings with commonest combination of covering materials in some cities in South-western Nigeria were investigated using an active electronic radon gas detector, RAD 7. The commonest combination of covering materials were (A): paint, paint, carpet; (B): paint fiber board, plastic tiles; (C): paint, fiber board, ceramic tiles for walls, ceilings and floors respectively. Result: The mean indoor radon concentration measured ranged between 23.08 Bq m-3 and 72.14 Bq m-3 for all the residential buildings investigated. Buildings with covering materials C, presented the highest radon concentration. Generally, the mean indoor radon concentration for all combinations of covering materials in all the cities investigated were found to be lower than the recommended action level of 200 Bqm-3 and the reference level of 100 Bqm-3 set by International Commission on for Radiation Protection and World Health Organization respectively. The annual tracheobronchial effective dose estimated for the different lung dose models ranged from 0.91 mSv – 3.27 mSv for combination (A), 1.00 mSv - 3.60 mSv for combination (B) and 1.09 mSv – 3.94 mSv for combination (C). It revealed that the more recent model gives greater value of the annual tracheobronchial effective dose. It was observed that only the annual tracheobronchial effective doses obtained by the James model presented values that are within the recommended ICRP intervention level of (3-10) mSvy-1. Other models gave values of annual tracheobronchial effective doses below the ICRP recommended intervention levels. Conclusion: These imply that all the residential buildings and the different combination of covering materials surveyed in this work will not pose any radiological hazard to the inhabitants. Key words: Indoor Radon Inhalation, Radon-222, annual tracheobronchial effective dose, residential buildings

Justification of Remediation Criteria of Uranium Legacy Sites

2021 ◽  
Vol 66 (4) ◽  
pp. 54-57
Author(s):  
A. Titov ◽  
N. Shandala ◽  
Yu. Bel'skih ◽  
D. Isaev ◽  
M. Semenova ◽  
...  
Keyword(s):  
Effective Dose ◽  
Radiation Safety ◽  
Annual Effective Dose ◽  
Uranium Mining ◽  
Radioactive Material ◽  
Reference Level ◽  
Federal Law ◽  
Reference Levels ◽  
Economic Activities ◽  
Safety Standards

Purpose: To present approaches to establishing the criteria for remediation of sites contaminated due to past activities of uranium mining and milling facilities. These facilities are considered today as uranium legacy. Results: This paper presents the justified reference levels expressed in terms of annual effective dose values, which are recommended for using as remediation criteria for sites contaminated due to past activities of uranium mining and milling facilities (uranium legacy sites). Depending on further use of the sites after remediation, these criteria range from 1 µSv/year, in case of temporary presence of the population, to 10 µSv/year, in case of permanent residence of the population and conducting economic activities. Conclusions: In accordance with the international basic safety standards, accepted more than 10 years ago, exposure situations from radioactive material retained from previous activities refer to the existing exposure situation. Nevertheless, neither Federal Law “On Radiation Safety of the Population” nor Radiation Safety Standards have so far introduced terms “existing exposure situation” covering exposure at nuclear and uranium legacy sites and “reference level”, which is used to assure radiation safety of the population living at legacy sites or using these sites for the purpose of the economic activities.

Establishing local diagnostic reference levels for adult computed tomography in Morocco

2022 ◽  
Author(s):  
M. El Mansouri ◽  
M. Talbi ◽  
A. Choukri ◽  
O. Nhila ◽  
M. Aabid
Keyword(s):  
Computed Tomography ◽  
Adult Patients ◽  
Radiation Doses ◽  
Diagnostic Reference Levels ◽  
Reference Levels ◽  
Dose Length Product ◽  
Head Ct ◽  
Ct Examination ◽  
Japanese Studies ◽  
The Uk

In Morocco, the radiation doses received by adult patients are increasing due to the number of CT examinations performed and the larger number of computed tomography (CT) scanners installed. The aim of this study was to evaluate the radiation doses received by patients for the most common adult CT examinations in order to establish local diagnostic reference levels (DRLs). Data from 1016 adult patients were collected during 3 months from four Moroccan hospitals. Dose length product (DLP) and volumetric computed tomography dose index (CTDIvol) were evaluated by determining the 75th percentile as diagnostic reference levels for the most common examinations including head, chest and abdomen. The DRL for each examination was compared with other studies. The established DRLs in Morocco in terms of CTDIvol were 57.4, 12.3 and 10.9 for CT examinations of the head, chest, abdomen, respectively. For DLP, they were 1020, 632 and 714, respectively. These established DRLs for CTDIvol were almost similar to the UK DRLs at all examinations, higher than the Egyptian DRLs and lower than the Japanese DRLs at the head CT examination, lower than the DRLs from Egypt and Japan at the CT abdomen examination. In terms of DLP, the DRLs were higher than those of the British studies, lower than those of the Egyptian and Japanese studies at the head CT examination were higher at chest CT and lower at abdominal CT than those of all selected studies. The higher level of established DRLs in our study demonstrates the requirement of an optimization process while keeping a good image quality for a reliable diagnosis.

scholarly journals Study on the Effect of Individual Factors on the Radiation Dose in Chest CT

2020 ◽  
Author(s):  
Dechuan Zhang ◽  
Longling Fan ◽  
Xuqian Liang ◽  
Teiying Yin ◽  
Qigen Li ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Radiation Dose ◽  
Ct Scan ◽  
Ct Scanning ◽  
Multivariate Regression Analysis ◽  
Major Effect ◽  
Chest Ct ◽  
Individual Factors ◽  
Dose Length Product ◽  
Ct Radiation

Abstract Objective To explore the influence of patient’s individual factors on the radiation dose in chest computed tomography (CT) scan. Methods Based on the clinical chest CT scan scheme and the scanning conditions were unified, Basic data of 103 patients who underwent chest CT scanning, including gender, age, height, weight and underlying diseases, were prospectively collected, and the dose length product (DLP) of each patient was recorded, Multivariate regression analysis was made on the obtained data. Results Under the same scanning parameters, image quality had no significant effect on chest CT radiation dose (P = 0.404 > 0.05); among the 103 cases, there were 20 kinds of basic diseases, only calcified lesion has a significant effect on chest CT radiation dose (P = 0.009 < 0.05), the other had no significant effects (P > 0.05); the major effect individual factors of radiation dose in CT scan were: gender (P = 0.000003 < 0.05), age (P = 0.016 < 0.05), height (P = 0.000021 < 0.05), weight (P = 4.30E-16 < 0.05). Age (P = 8.08E-8 < 0.05) and weight (P = 5.52E-21 < 0.05) were the only decisive factors in multiple regression analysis, while other influencing factors were not decisive (P > 0.05). The regression model was as follows: DLP=-39.45 + 2.19*age + 5.54*weight, the coefficient of multiple correlation R being 0.786, F(2,100) = 77.128, P < 0.01. Mean that gradually increase in age was related with 2.19 mGy∙cm increase in the DLP value, 1 kg increase in weight was associated with 5.54 mGy∙cm increase in the DLP value. Conclusion For chest CT, age and weight are the major impact individual factors of radiation dose. This model has shown obvious clinical significance and can provide solid theoretical basis for clinical application in reducing the radiation dose in chest CT.

scholarly journals Specific Activities of Natural Radionuclides and Annual Effective Dose Due to the Intake of Some Types of Children Powdered Milk Available in Baghdad Markets

2017 ◽  
Vol 14 (3) ◽  
pp. 619-624
Author(s):  
Baghdad Science Journal
Keyword(s):  
Effective Dose ◽  
Sodium Iodide ◽  
Specific Activity ◽  
Annual Effective Dose ◽  
Natural Radionuclides ◽  
Mean Value ◽  
Powdered Milk ◽  
Effective Doses ◽  
The Mean ◽  
Specific Activities

In this research the specific activity of natural radionuclides 226Ra, 232Th and 40K were determined by sodium iodide enhanced by thallium NaI(TI) detector and assessed the annual effective dose in Dielac 1 and 2 and Nactalia 1 and 2 for children of less than 1 year which are available in Baghdad markets. The specific activity of 40K has the greater value in all the types which is in the range of allowed levels globally that suggested by UNSCEAR. The mean value of annual effective doses were 2.92, 4.005 and 1.6325 mSv/y for 226Ra, 232Th and 40K respectively.

Comparison of Radiation Dose in CT Examinations At PIMS with European Commission Reference Doses

2021 ◽  
Vol 17 (3) ◽  
pp. 216-221
Author(s):  
Fawad Yasin ◽  
Anum Rasheed ◽  
Muhammad Nauman Malik ◽  
Farheen Raza ◽  
Ramish Riaz ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Radiation Dose ◽  
European Commission ◽  
Large Scale ◽  
Radiology Department ◽  
Radiation Doses ◽  
Diagnostic Reference Levels ◽  
Reference Levels ◽  
Dose Length Product ◽  
Ct Dose

OBJECTIVE - The purpose of this study was to assess the radiation dose levels from common computed tomography (CT) examinations performed in Radiology Department of Pakistan Institute of Medical Sciences (PIMS), and evaluate these according to diagnostic reference levels (DRLs) proposed by European Commission (EC) guidelines, and thus contributing towards the establishment of local and national DRLs. To the best of our knowledge, this is the first study of its kind to explore radiation doses from CT examinations in Pakistan. STUDY DESIGN - This was a quantitative study conducted at PIMS, Islamabad, spanning a duration of eight weeks. Scan parameters and dose profile data of 1506 adults undergoing examinations of head, neck, chest and abdomen-pelvis regions, comprising of single- and multi-phase, contrast-enhanced and unenhanced studies. Dose indicators utilized by EC guidelines for DRLs include volume CT dose index (CTDIvol) and Dose Length Product (DLP) for single slice and complete examination radiation doses, respectively. METHOD - Values of CTDIvol, DLP and scan lengths were extracted from the CT operators console. Other control variables included gender, contrast enhancement and phasicity of study. IBM SPSS package was used to obtain descriptive statistics such as mean and quartiles. RESULTS - DRLs calculated as 75th percentile of CTDIvol, DLP for various anatomical regions are by and far comparable to European DRLs. CONCLUSION – This study describes institutional diagnostic reference levels for common CT exams in Islamabad and provides benchmark values for future reference. Our DRL values are mostly comparable to European and international DRLs. Similar, albeit large scale, surveys are recommended for establishment of local and national DRLs, eventually contributing towards development of regional DRLs. KEYWORDS: CTDIvol, DLP, Diagnostic Reference Levels, Computed Tomography, Radiation Monitoring, Scan length

scholarly journals DIAGNOSTIC IMAGING AND IONIZING RADIATION EXPOSURE IN A LEVEL 1 TRAUMA CENTRE POPULATION MET WITH TRAUMA TEAM ACTIVATION: A ONE-YEAR PATIENT RECORD AUDIT

2020 ◽  
Vol 189 (1) ◽  
pp. 35-47
Author(s):  
Anna Bågenholm ◽  
Pål Løvhaugen ◽  
Rune Sundset ◽  
Tor Ingebrigtsen
Keyword(s):  
Diagnostic Imaging ◽  
Radiation Exposure ◽  
Effective Dose ◽  
Trauma Team ◽  
Trauma Centre ◽  
Whole Body ◽  
Reference Level ◽  
Dose Length Product ◽  
Trauma Team Activation ◽  
X Ray

Abstract This audit describes ionizing and non-ionizing diagnostic imaging at a regional trauma centre. All 144 patients (males 79.2%, median age 31 years) met with trauma team activation from 1 January 2015 to 31 December 2015 were included. We used data from electronic health records to identify all diagnostic imaging and report radiation exposure as dose area product (DAP) for conventional radiography (X-ray) and dose length product (DLP) and effective dose for CT. During hospitalization, 134 (93.1%) underwent X-ray, 122 (84.7%) CT, 92 (63.9%) focused assessment with sonography for trauma (FAST), 14 (9.7%) ultrasound (FAST excluded) and 32 (22.2%) magnetic resonance imaging. One hundred and sixteen (80.5%) underwent CT examinations during trauma admissions, and 73 of 144 (50.7%) standardized whole body CT (SWBCT). DAP values were below national reference levels. Median DLP and effective dose were 2396 mGycm and 20.42 mSv for all CT examinations, and 2461 mGycm (national diagnostic reference level 2400) and 22.29 mSv for a SWBCT.

ESTIMATION OF OCCUPATIONAL RADIATION EXPOSURE FOR MEDICAL WORKERS IN RADIOLOGY AND CARDIOLOGY IN THE UNITED ARAB EMIRATES: NINE HOSPITALS EXPERIENCE

2020 ◽  
Vol 189 (4) ◽  
pp. 466-474
Author(s):  
Wiam Elshami ◽  
Mohamed Abuzaid ◽  
Antti Pekkarinen ◽  
Mika Kortesniemi
Keyword(s):  
Radiation Exposure ◽  
Effective Dose ◽  
United Arab Emirates ◽  
Time Trend ◽  
International Standards ◽  
Occupational Radiation Exposure ◽  
High Exposure ◽  
Effective Doses ◽  
The Mean ◽  
Occupational Radiation

Abstract Purpose Occupational radiation exposure for medical workers in radiology and cardiology was analyzed in nine hospitals in the UAE between 2002 and 2016. The purpose of the study was to determine the time trend and the differences in occupational radiation exposure among worker groups and hospitals in the country. Methods Readings of 5700 thermoluminescence dosimeters (TLDs) were obtained from 1011 medical workers and grouped into 5 worker groups (radiographers, diagnostic radiologists, nurses, cardiologists and physicians). Results The mean annual effective dose was from 0.38 to 0.62 mSv per worker. Even though an increase in the collective effective dose has been noticed during the study period, no significant time trend was observed in the mean effective dose. Furthermore, cardiologists received higher mean and maximum effective doses than the other worker groups. Conclusion The annual effective doses were below the limits set by national legislation and international standards, and for the average worker, the likelihood of high exposure is small. However, improvements in radiation protection practices could be implemented to reduce occupational radiation dose to cardiologists, who were the most exposed worker group in this study.

ADULT CT EXAMINATIONS IN ALGERIA: TOWARDS UPDATING NATIONAL DIAGNOSTIC REFERENCE LEVELS

2020 ◽  
Vol 190 (4) ◽  
pp. 364-371
Author(s):  
Nadia Khelassi-Toutaoui ◽  
Ahmed Merad ◽  
Virginia Tsapaki ◽  
Fouzia Meddad ◽  
Zakia Sakhri-Brahimi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Radiation Doses ◽  
Diagnostic Reference Levels ◽  
Reference Levels ◽  
Dose Length Product ◽  
Institutional Evaluation ◽  
Starting Point ◽  
First Results ◽  
Ct Radiation ◽  
Computed Tomography Dose Index

Abstract A pilot study has concerned the most frequent computed tomography examinations (CT). This represents the first results based on actual survey for diagnostic reference levels (DRLs) establishment in Algeria. A total number of 2540 patients underwent this survey that has included the recording of CT parameters, computed tomography dose index (CTDIvol) and dose-length product of the head, thorax, abdomen, abdomen–pelvis (AP), lumbar spine (LS) and thorax–abdomen–pelvis (TAP) performed on standard patients. The proposed DRLs are 71 mGy/1282 mGy.cm for head, 16 mGy/555 mGy.cm for thorax, 18 mGy/671 mGy.cm for abdomen, 21 mGy/950 mGy.cm for AP, 36 mGy/957 mGy.cm for LS and 18 mGy/994 mGy.cm for TAP. The rounded 75th percentile seems to be higher in some examinations compared to the literature. Our findings confirm the need to optimise our practice. These results provide a starting point for institutional evaluation of CT radiation doses.

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