scholarly journals Optimization of the Maximum Skin Dose Measurement Technique Using Digital Imaging and Communication in Medicine—Radiation Dose Structured Report Data for Patients Undergoing Cerebral Angiography

Diagnostics ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 14
Author(s):  
Koichi Morota ◽  
Takashi Moritake ◽  
Keisuke Nagamoto ◽  
Satoru Matsuzaki ◽  
Koichi Nakagami ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Cerebral Angiography ◽  
Digital Imaging ◽  
Conversion Factor ◽  
Quadratic Function ◽  
Skin Dose ◽  
Estimation Model ◽  
Data Set ◽  
Structured Report ◽  
R Ratio

Understanding the maximum skin dose is important for avoiding tissue reactions in cerebral angiography. In this study, we devised a method for using digital imaging and communication in medicine—radiation dose structured report (DICOM-RDSR) data to accurately estimate the maximum skin dose from the total air kerma at the patient entrance reference point (Total Ka,r). Using a test data set (n = 50), we defined the mean ratio of the maximum skin dose obtained from measurements with radio-photoluminescence glass dosimeters (RPLGDs) to the Total Ka,r as the conversion factor, CFKa,constant, and compared the accuracy of the estimated maximum skin dose obtained from multiplying Total Ka,r by CFKa,constant (Estimation Model 1) with that of the estimated maximum skin dose obtained from multiplying Total Ka,r by the functional conversion factor CFKa,function (Estimation Model 2). Estimation Model 2, which uses the quadratic function for the ratio of the fluoroscopy Ka,r to the Total Ka,r (Ka,r ratio), provided an estimated maximum skin dose closer to that obtained from direct measurements with RPLGDs than compared with that determined using Estimation Model 1. The same results were obtained for the validation data set (n = 50). It was suggested the quadratic function for the Ka,r ratio provides a more accurate estimate of the maximum skin dose in real time.

scholarly journals Collection of DICOM RDSR (Digital Imaging and Communication in Medicine, Radiation Dose Structured Report) Information Aimed at Reducing Patient Exposure Dose

2016 ◽  
Vol 38 (4) ◽  
pp. 335-343
Author(s):  
Koichi MOROTA ◽  
Takashi MORITAKE ◽  
Lue SUN ◽  
Takahiro ISHIHARA ◽  
Natsuyo KUMA ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Digital Imaging ◽  
Exposure Dose ◽  
Patient Exposure ◽  
Structured Report

scholarly journals How to Measure/Calculate Radiation Dose in Patients?

2021 ◽  
Author(s):  
Reinhard Loose ◽  
Michael Wucherer
Keyword(s):  
Radiation Dose ◽  
Digital Imaging ◽  
Adverse Reactions ◽  
Management Systems ◽  
Skin Dose ◽  
Skin Injuries ◽  
Threshold Doses ◽  
Dose Management ◽  
Dose Levels ◽  
Peak Skin Dose

AbstractPatients in fluoroscopically guided interventions (FGI) may be exposed to substantial radiation dose levels (SRDL). The most commonly reported adverse reactions are skin injuries with erythema or necrosis. It is therefore important for the interventional radiologist to know deterministic effects with their threshold doses. If possible all relevant modality parameters should be displayed on the interventionalists screen. Dosimetric parameters should be displayed in digital imaging and communications in medicine (DICOM) units and stored as DICOM Radiation Dose Structured Report (RDSR). The peak skin dose (PSD) is the most relevant risk parameter for skin injuries. Dose management systems (DMS) help optimising radiation exposure of patients. However, their calculation of skin dose maps is only available after a FGI. Therefore, dose maps and PSD should preferably be calculated and displayed in real time by the modality.

EVALUATION OF OCCUPATIONAL RADIATION EXPOSURE IN A RADIO-DIAGNOSTIC FACILITY IN KATSINA- NIGERIA

2020 ◽  
Vol 4 (2) ◽  
pp. 722-729
Author(s):  
Usman Sani ◽  
Bashir Gide Muhammad ◽  
Dimas Skam Joseph ◽  
D. Z. Joseph
Keyword(s):  
Radiation Dose ◽  
Radiation Exposure ◽  
Short Exposure ◽  
Skin Dose ◽  
Continuous Training ◽  
Short Exposure Time ◽  
Occupational Dose ◽  
Dose Limits ◽  
Radiation Workers ◽  
Occupational Radiation

Poor implementation of quality assurance programs in the radiation industry has been a major setback in our locality. Several studies revealed that occupational workers are exposed to many potential hazards of ionizing radiation during radio-diagnostic procedures, yet radiation workers are often not monitored. This study aims to evaluate the occupational exposure of the radiation workers in Federal Medical Centre Katsina, and to compare the exposure with recommended occupational radiation dose limits. The quarterly readings of 20 thermo-luminescent dosimeters (TLDs') used by the radiation workers from January to December, 2019 were collected from the facility's radiation monitoring archive, and subsequently assessed and analyzed. The results indicate that the average annual equivalent dose per occupational worker range from 0.74 to 1.20 mSv and 1.28 to 2.21 mSv for skin surface and deep skin dose, measured at 10 mm and 0.07 mm tissue depth respectively. The occupational dose was within the recommended national and international limits of 5 mSv per annum or an average of 20 mSv in 5 years. Therefore, there was no significant radiation exposure to all the occupational workers in the study area. Though, the occupational radiation dose is within recommended limit, this does not eliminate stochastic effect of radiation. The study recommended that the occupational workers should adhere and strictly comply with the principles of radiation protection which includes distance, short exposure time, shielding and proper monitoring of dose limits. Furthermore, continuous training of the radiation workers is advised.

scholarly journals The biological effect of cage design corrected for reductions in spray penetration

2014 ◽  
Vol 54 (4) ◽  
pp. 395-400 ◽  
Author(s):  
Bradley Keith Fritz ◽  
Wesley Clint Hoffmann ◽  
Jane Annalise Sara Bonds ◽  
Keith Haas ◽  
Zbigniew Czaczyk
Keyword(s):  
Wind Tunnel ◽  
Biological Effect ◽  
Conversion Factor ◽  
Mortality Data ◽  
Data Set ◽  
Spray Penetration ◽  
Mosquito Mortality ◽  
Insect Mortality ◽  
Group Variation ◽  
Penetration Data

Abstract In-field measures of physical spray concentration do not tend to correlate well with caged insect mortality data. This is partly due to the reduced penetration of the spray into the cage. Spray penetration is hindered by the structure of the cage. Wind tunnel studies were conducted to investigate the accuracy of those calculations developed to correct for filtration levels in caged mosquito bioassays. Zenivex E20 (Etofenprox) was applied at rates ranging from an LD10 to an LD90. Three cage types were used, each with different penetration levels. The dose approaching the cage was converted to the dose entering the cage using cage penetration data from previous research. The penetration conversion factor returned a data set that directly correlated dose with mosquito mortality (R2 = = 0.918). The mortality percent was a function of the dose within the cage. The mesh type acted as a regulator. Although the conversion factor was effective, the differences between cages was not always significant due to within-group variation.

scholarly journals Revenue diversification and financial sustainability of microfinance institutions

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Peter Nderitu Githaiga
Keyword(s):  
Generalized Method Of Moments ◽  
Financial Sustainability ◽  
Microfinance Institutions ◽  
Revenue Diversification ◽  
Estimation Model ◽  
Data Set ◽  
Content Type ◽  
Method Of Moments Estimation ◽  
The Impact ◽  
Positive Effect

PurposeThis paper aims to investigate whether revenue diversification affects the financial sustainability of microfinance institutions (MFIs).Design/methodology/approachThe study uses a worldwide panel data set of 443 MFIs in 108 countries for the period 2013–2018 and two-step system Generalized Method of Moments estimation model.FindingsThe study finds that revenue diversification has a significant and positive effect on the financial sustainability of MFIs.Practical implicationsThe findings of this study actually offer important managerial and policy lessons on MFIs’ financial sustainability. Microfinance managers and policymakers should consider revenue diversification as a strategy through which MFIs can attain financial sustainability instead of overreliance on donations and government subsidiesOriginality/valueUnlike previous studies that examined revenue diversification in the context of banking firms, this study contributes to literature by examining the impact of revenue diversification of the financial sustainability of MFIs.

scholarly journals Political Economy of Discretionary Transfers: A Dynamic Panel Data analysis of Indian States

2018 ◽  
Vol 5 (01) ◽  
Author(s):  
Chittaranjan Nayak ◽  
. PriyabrataSatpathy
Keyword(s):  
Political Economy ◽  
Panel Data ◽  
Fiscal Federalism ◽  
Panel Data Analysis ◽  
Dynamic Panel Data ◽  
Intergovernmental Transfers ◽  
Estimation Model ◽  
Indian States ◽  
Data Set ◽  
National Governments

Intergovernmental transfers are a major instrument to ensure smooth functioning of ‘Fiscal federalism’ in India. But the mechanism of Central transfers in India seems to be confusing and overlapping. Although a formula-based practice has been mandated by the Indian Constitution, there are several breaks in the practice. While predetermined formulas are used for some transfers, there is considerable discretion in allocating other classes of transfers. This paper makes an attempt to focus on the determinants that influence the quantum of discretionary transfer to sub-national governments from a political economy perspective. Taking a panel data set of 28 states for the period 2001 to 2011, and by using Arrellana-Bover (1995)/ Blundell-Bond (1998) system estimation model, the paper observes that the chosen variables do explain disparity in Central fund disbursement under non formulaic discretionary head in a robust way. The study has analysed the results separately for SCS and NSCS and in combine. The findings of the study reveal that the chosen variables have different outcomes for SCS and NSCS. However, when SCS and NSCS states are combined, the variables like fiscal capacity, fiscal performance and coalition status are found to be significant.

AN ASSESSMENT OF RADIATION EXPOSURE DOSES IN PATIENTS UNDERGOING PRIMARY PERCUTANEOUS CORONARY INTERVENTION BASED ON ANGIOGRAPHIC RECORDS

2018 ◽  
Vol 183 (4) ◽  
pp. 475-482 ◽  
Author(s):  
M Maghbool ◽  
M A Hosseini
Keyword(s):  
Percutaneous Coronary Intervention ◽  
Radiation Dose ◽  
Primary Percutaneous Coronary Intervention ◽  
Standard Dose ◽  
Coronary Intervention ◽  
Skin Dose ◽  
Dose Area Product ◽  
Percutaneous Coronary ◽  
Using Data ◽  
Area Product

Abstract The stochastic and non-stochastic (deterministic) effects of radiation dose in patients undergoing primary percutaneous coronary intervention (PPCI) have been investigated using data recorded by an angiographic monitoring system. A total of 132 patients with acute myocardial infarction referred to the angiography department of Vali-Asr hospital, Fasa, Iran, during the second half of 2016 were recruited. Quantities like dose–area product (DAP), total air kerma (Ka,r) and fluoroscopy time (FT) were calculated and converted into effective dose (ED) and peak skin dose (PSD). The values for Ka,r, DAP and FT equaled 80 399.20 ± 63 312 mGy cm2, 1392.80 ± 1155.373 mGy and 524.11 ± 423.057 s, respectively, which were within the ranges reported in previous studies. After considering standard dose thresholds for Ka,r and PSD, it was revealed that only a small portion of patients had reached these thresholds and exceeded them (<3%). Moreover, ED < 20 mSv for the majority of patients was fairly consistent with results from a recent research in eight Belgian hospitals. It was shown that angiographic records are reliable for assessing radiation dose in patients.

SU-E-I-74: Modality SR: Using the DICOM Radiation Dose Structured Report

2011 ◽  
Vol 38 (6Part5) ◽  
pp. 3412-3412
Author(s):  
R Paden ◽  
W Pavlicek ◽  
M Peter ◽  
T Boltz
Keyword(s):  
Radiation Dose ◽  
Structured Report

Analysis of radiation doses incurred during diagnostic cerebral angiography after the implementation of dose reduction strategies

2016 ◽  
Vol 9 (4) ◽  
pp. 384-388 ◽  
Author(s):  
Tanja Schneider ◽  
Emily Wyse ◽  
Monica S Pearl
Keyword(s):  
Radiation Dose ◽  
Dose Reduction ◽  
Cerebral Angiography ◽  
Pediatric Patients ◽  
Radiation Doses ◽  
Digital Subtraction ◽  
Air Kerma ◽  
Reduction Strategies ◽  
Technical Modifications ◽  
Area Product

BackgroundOne goal of increasing awareness of radiation dose is to encourage personal and technical modifications in order to reduce the radiation exposure of patients and staff.ObjectiveTo analyze the radiation doses incurred during diagnostic cerebral angiography and the angiographic techniques practiced over a 4-year period, in order to demonstrate the effectiveness of implementing radiation dose reduction strategies.MethodsA retrospective review of the first 50 consecutive adult and pediatric patients undergoing diagnostic cerebral angiography each year from 2010 to 2013 was performed. Angiograms and procedure examination protocols were reviewed for patient age, gender, diagnosis, angiography techniques, fluoroscopy time, reference point air kerma (Ka,r in mGy), and kerma-area product (PKA in μGym2).ResultsFrom January 2010 to June 2013, a total of 231 diagnostic cerebral angiograms were reviewed (200 adults, 31 children). Adult patients were aged from 19 to 94 years and included 77 men and 123 women. Pediatric patients were aged from 2 to 18 years and comprised 11 boys and 20 girls. Median Ka,r and PKA significantly decreased from 2010 to 2013 in adults (1867 mGy; 21 231 µGym2 vs 653 mGy; 7860 µGym2) and children (644 mGy; 6495 µGym2 vs138 mGy; 1465 µGym2), (p<0.001).ConclusionsIncreased awareness and implementation of dose reduction strategies resulted in decreased radiation doses for diagnostic cerebral angiography both in adult and pediatric patients. The use of lower and variable digital subtraction angiography frame rates and tailored examinations contributed significantly to the reduced radiation doses observed during diagnostic cerebral angiography.

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