ASSESSMENT ON THE INTERCHANGEABILITY OF PERSONAL EFFECTIVE DOSE ALGORITHMS IN FLUOROSCOPY-GUIDED INTERVENTIONS USING BLAND-ALTMAN ANALYSIS

2019 ◽  
Vol 186 (4) ◽  
pp. 462-468
Author(s):  
Asmah Bohari ◽  
Suhairul Hashim ◽  
Sib Krishna Ghoshal ◽  
Siti Norsyafiqah Mohd Mustafa
Keyword(s):  
Interventional Radiology ◽  
Effective Dose ◽  
Statistical Significance ◽  
Correlation Coefficients ◽  
Distributed Data ◽  
Altman Analysis ◽  
Bland Altman Analysis ◽  
Effective Evaluation ◽  
Effective Doses ◽  
Radiology Staff

Abstract Long exposure to radiation from fluoroscopy-guided interventions (FGIs) can be detrimental to both patients and radiologists. The effective doses received by the interventional radiology staff after performing 230 FGIs in a year were assessed by using double dosimetry and five various algorithms. The Shapiro–Wilk test revealed normally-distributed data (p < 0.01), while the significant correlation coefficients between the effective doses ranged between 0.88 and 1.00. As for the Bland–Altman analysis, both Niklason and Boetticher algorithms strongly supported the absence of statistical significance between the estimated effective doses. This portrays that the occupational doses received by the interventional radiology staff during FGIs fall within the acceptable limit regardless of the varied algorithms applied. In short, the Niklason and Boetticher algorithms appeared to be the more interchangeable ones for effective evaluation of doses. This is in view of their strong mutual correlations and excellent agreement.

Awareness of radiation doses and risks among radiology residents, fellows, specialists, consultants and technologists in Jeddah, Saudi Arabia: Cross-Sectional Study. (Preprint)

2019 ◽  
Author(s):  
Bashayer Hassan Shuaib ◽  
Rahaf Hisham Niazi ◽  
Ahmed Haitham Abduljabbar ◽  
Mohammed Abdulraheem Wazzan
Keyword(s):  
Interventional Radiology ◽  
Ionizing Radiation ◽  
Statistical Significance ◽  
Knowledge Score ◽  
P Value ◽  
Radiation Doses ◽  
Cross Sectional ◽  
The Right ◽  
Interventional Radiology Procedures ◽  
Radiology Staff

BACKGROUND Radiology now plays a major role to diagnose, monitoring, and management of several diseases; numerous diagnostic and interventional radiology procedures involve exposure to ionizing radiation. Radiology now plays a major role to diagnose, monitoring, and management of several diseases; numerous diagnostic and interventional radiology procedures involve exposure to ionizing radiation. OBJECTIVE This study aimed to discover and compare the awareness level of radiation doses, protection issues, and risks among radiology staff in Jeddah hospitals. METHODS A cross-sectional survey containing 25 questions on personal information and various aspects of radiation exposure doses and risks was designed using an online survey tool and the link was emailed to all radiology staff in eight tertiary hospitals in Jeddah. The authors were excluded from the study. A P-value of < .05 was used to identify statistical significance. All analyses were performed using SPSS, version 21. RESULTS Out of 156 participants the majority 151 (96.8%) had poor knowledge score, where the mean scores were 2.4±1.3 for doses knowledge, 2.1±1.1for cancer risks knowledge, 2.3±0.6 for general information, and 6.7±1.9 for the total score. Only 34.6% of the participants were aware of the dosage of a single-view chest x-ray, and 9.0% chose the right answer for the approximate effective dose received by a patient in a two-view. 42.9% were able to know the correct dose of CT abdomen single phase. There is a significant underestimation of cancer risk of CT studies especially for CT abdomen where only 23.7% knew the right risk. A p-value of <0.05 was used to identify statistical significance. No significant difference of knowledge score was detected regarding gender (P =.2) or work position (P=.66). CONCLUSIONS Our survey results show considerable inadequate knowledge in all groups without exception. We recommended a conscientious effort to deliver more solid education and obtain more knowledge in these matters and providing periodic training courses to teach how to minimize the dose of radiation and to avoid risk related. CLINICALTRIAL not applicable

Intrahospital Correlation of the International Normalized Ratio

2008 ◽  
Vol 15 (2) ◽  
pp. 220-224 ◽  
Author(s):  
Alejandro Lazo-Langner ◽  
Rosario Villa-Márquez ◽  
Darinel Hernández-Hernández ◽  
Sonia Rojas-Maya ◽  
Josefa Piedras
Keyword(s):  
Oral Anticoagulant Therapy ◽  
Warfarin Dose ◽  
Correlation Coefficients ◽  
Coagulation Factors ◽  
International Normalized Ratio ◽  
Rabbit Brain ◽  
Clinical Use ◽  
Altman Analysis ◽  
Bland Altman Analysis ◽  
Highly Sensitive

Background. Monitoring of oral anticoagulant therapy (OAT) is usually accomplished by measuring prothrombin time and the international normalized ratio (INR). However, thromboplastins have different responsiveness and sensitivity to vitamin K—dependent coagulation factors depletion. Several studies have shown INR variation when low sensitive thromboplastins are used. This study compared INR variability between two laboratories using highly sensitive thromboplastins. Methods. A total of 237 plasmas were tested, half of them from patients under OAT. Samples were tested simultaneously in two laboratories: in laboratory A, a Behring Coagulation Timer instrument and a human recombinant thromboplastin (Innovin, Dade Behring) (ISI 1.01) were used. In laboratory B, a Thrombolyzer Compact (Behnk Elektronik) and a rabbit brain thromboplastin (Simplastin Excel S, Organon Teknika) with an ISI of 1.30 were used. Statistical analysis was carried out according to the method of Bland and Altman. Results. Even though high correlation coefficients were obtained when comparing both laboratories, Bland—Altman analysis showed a variation of INR between laboratories ranging from −0.77 to +1.07. After logarithmic transformation of data, these values yielded a variation of the INR either 25% below or 44% above. Conclusions. These results are clearly inadequate for clinical use because such a variation would most probably induce the clinician to make a change in warfarin dose. Standardization of instruments, reagents, and controls is warranted to decrease this variation.

The Accuracy and Reproducibility of Linear Measurements Made on CBCT-derived Digital Models

2016 ◽  
Vol 17 (4) ◽  
pp. 294-299 ◽  
Author(s):  
Mohammad Y Hajeer ◽  
Ahmad L Maroua ◽  
Mowaffak Ajaj
Keyword(s):  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Intraobserver Reliability ◽  
Altman Analysis ◽  
Digital Models ◽  
Linear Measurements ◽  
Bland Altman Analysis ◽  
Accuracy Of Measurements ◽  
The Mean ◽  
Plaster Models

ABSTRACT Objective To evaluate the accuracy and reproducibility of linear measurements made on cone-beam computed tomography (CBCT)-derived digital models. Materials and methods A total of 25 patients (44% female, 18.7 ± 4 years) who had CBCT images for diagnostic purposes were included. Plaster models were obtained and digital models were extracted from CBCT scans. Seven linear measurements from predetermined landmarks were measured and analyzed on plaster models and the corresponding digital models. The measurements included arch length and width at different sites. Paired t test and Bland–Altman analysis were used to evaluate the accuracy of measurements on digital models compared to the plaster models. Also, intraclass correlation coefficients (ICCs) were used to evaluate the reproducibility of the measurements in order to assess the intraobserver reliability. Results The statistical analysis showed significant differences on 5 out of 14 variables, and the mean differences ranged from −0.48 to 0.51 mm. The Bland–Altman analysis revealed that the mean difference between variables was (0.14 ± 0.56) and (0.05 ± 0.96) mm and limits of agreement between the two methods ranged from −1.2 to 0.96 and from −1.8 to 1.9 mm in the maxilla and the mandible, respectively. The intraobserver reliability values were determined for all 14 variables of two types of models separately. The mean ICC value for the plaster models was 0.984 (0.924–0.999), while it was 0.946 for the CBCT models (range from 0.850 to 0.985). Conclusion Linear measurements obtained from the CBCTderived models appeared to have a high level of accuracy and reproducibility. How to cite this article Maroua AL, Ajaj M, Hajeer MY. The Accuracy and Reproducibility of Linear Measurements Made on CBCT-derived Digital Models. J Contemp Dent Pract 2016;17(4):294-299.

Comparison of double dosimetry algorithms for estimating the effective dose in occupational dosimetry of interventional radiology staff

2008 ◽  
Vol 131 (1) ◽  
pp. 80-86 ◽  
Author(s):  
H. Jarvinen ◽  
N. Buls ◽  
P. Clerinx ◽  
S. Miljanic ◽  
D. Nikodemova ◽  
...  
Keyword(s):  
Interventional Radiology ◽  
Effective Dose ◽  
Radiology Staff

scholarly journals Reliability and Validity of Trunk Assessment for People With Multiple Sclerosis

2006 ◽  
Vol 86 (1) ◽  
pp. 66-76 ◽  
Author(s):  
Geert Verheyden ◽  
Godelieve Nuyens ◽  
Alice Nieuwboer ◽  
Pol Van Asch ◽  
Piet Ketelaer ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Construct Validity ◽  
Intraclass Correlation ◽  
Reliability And Validity ◽  
Correlation Coefficients ◽  
Weighted Kappa ◽  
Altman Analysis ◽  
Bland Altman Analysis ◽  
Intraclass Correlation Coefficients ◽  
Test Retest Reliability

Abstract Background and Purpose. Standardized scales are a prerequisite for rehabilitation and research. This study was designed to determine the reliability and validity of scores on items of the trunk assessment of the Melsbroek Disability Scoring Test (MDST) and Trunk Impairment Scale (TIS) in people with multiple sclerosis (MS). Subjects. Thirty people with MS participated in the study. Methods. Interrater and test-retest reliability and construct validity were assessed. Results. Kappa and weighted kappa values for the items of the trunk assessment of the MDST ranged from .74 to .95, and the kappa and weighted kappa values for the TIS items ranged from .46 to 1.00. Intraclass correlation coefficients for interrater and test-retest agreement were .93 and .92, respectively, for the trunk assessment of the MDST and .97 and .95, respectively, for the TIS. Bland-Altman analysis showed consistency of scores without observer bias. Construct validity was established. Discussion and Conclusion. The MDST and TIS provide reliable assessments of the trunk and are valid scales for measuring trunk performance in people with MS. [Verheyden G, Nuyens G, Nieuwboer A, et al. Reliability and validity of trunk assessment for people with multiple sclerosis.

scholarly journals Assessment of Operator Reliability in Ultrasound of the Median and Ulnar Nerve Using Bland-Altman Analysis

Diagnostics ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2134
Author(s):  
Jörg Philipps ◽  
Hannah Mork ◽  
Maria Katz ◽  
Mark Knaup ◽  
Kira Beyer ◽  
...  
Keyword(s):  
Ulnar Nerve ◽  
Intraclass Correlation ◽  
Sample Size Calculation ◽  
Correlation Coefficients ◽  
Altman Analysis ◽  
Nerve Ultrasound ◽  
Limits Of Agreement ◽  
Bland Altman Analysis ◽  
Intraclass Correlation Coefficients ◽  
Coefficients Of Variation

Currently, there is no standardized method to evaluate operator reliability in nerve ultrasound. A short prospective protocol using Bland–Altman analysis was developed to assess the level of agreement between operators with different expertise levels. A control rater without experience in nerve ultrasound, three novices after two months of training, an experienced rater with two years of experience, and a reference rater performed blinded ultrasound examinations of the left median and ulnar nerve in 42 nerve sites in healthy volunteers. The precision of Bland–Altman agreement analysis was tested using the Preiss–Fisher procedure. Intraclass correlation coefficients (ICC), coefficients of variation, and Bland–Altman limits of agreement were calculated. The sample size calculation and Preiss–Fisher procedure showed a sufficient precision of Bland–Altman agreement analysis. Limits of agreement of all trained novices ranged from 2.0 to 2.9 mm2 and were within the test’s maximum tolerated difference. Ninety-five percent confidence intervals of limits of agreement revealed a higher precision in the experienced rater’s measurements. Operator reliability in nerve ultrasound of the median and ulnar nerve arm nerves can be evaluated with a short prospective controlled protocol using Bland–Altman statistics, allowing a clear distinction between an untrained rater, trained novices after two months of training, and an experienced rater.

Verification of the accuracy and reliability of the TrackMan tennis radar

2020 ◽  
pp. 175433712095300
Author(s):  
Munenori Murata ◽  
Hiroo Takahashi
Keyword(s):  
Measurement Accuracy ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Spin Axis ◽  
Altman Analysis ◽  
Bland Altman Analysis ◽  
Practical Applications ◽  
Intraclass Correlation Coefficients ◽  
The Difference ◽  
Proven Method

TrackMan, a device used to measure the kinematics of a ball in flight, has recently been used for research and coaching purposes in tennis, and the number of studies on this device is expected to increase. This study is focused on verifying the accuracy of TrackMan; three participants performed services with various velocities and angular velocity combinations. TrackMan and a proven method based on computer vision were used to measure the speed, spin rate, and spin axis of the ball. The results obtained using each method were compared using regression analysis, intraclass correlation coefficients, and Bland–Altman analysis. The speed and spin rate of the two methods agreed well; the degree of error would not be problematic in practical applications. However, TrackMan underestimated the speed if it was unable to detect the hitting position. The spin axis measured by TrackMan was unstable under low spin rate conditions (<3000 rpm). Furthermore, the standard deviation of the spin axis measurement error exceeded the difference between the average slice and kick service spin axes reported in the previous study, so the spin axis measurement accuracy was very low for research purposes, even when the spin rate was above 3000 rpm. For those who are aware of the existence of outliers, TrackMan can be useful for coaching because it provides instant feedback. Similarly, the measured rotational speed and spin rate could be used in the study.

Overview of double dosimetry procedures for the determination of the effective dose to the interventional radiology staff

2008 ◽  
Vol 129 (1-3) ◽  
pp. 333-339 ◽  
Author(s):  
H. Jarvinen ◽  
N. Buls ◽  
P. Clerinx ◽  
J. Jansen ◽  
S. Miljanic ◽  
...  
Keyword(s):  
Interventional Radiology ◽  
Effective Dose ◽  
Radiology Staff

scholarly journals Oxygen saturation changes in relation to the use of gloves: an uncontrolled before and after intervention study

2021 ◽  
Author(s):  
Rocío Nieto Pérez ◽  
María Martínez Gascón ◽  
Marina Guisado-Clavero ◽  
Sara Ares-Blanco
Keyword(s):  
Oxygen Saturation ◽  
Medical History ◽  
Statistical Significance ◽  
Demographic Data ◽  
Age Groups ◽  
Analysis Data ◽  
Care Practice ◽  
Altman Analysis ◽  
Bland Altman Analysis ◽  
Before And After

Abstract Background: Nurses have had an essential role in health promotion (hand washing, social distance and wearing a mask) during COVID-19 pandemic. However, some patients wear gloves, which is a possible barrier to proper examination. The aim of this study was to determine the difference in oxygen saturation measurement with or without the use of powder-free nitrile gloves.Methods: A prospective quasi-experimental before and after study was conducted in a primary care practice (PCP) from Madrid. Intervention consisted in measuring oxygen saturation (SpO2) for each participant covering a finger with a powder-free nitrile glove and a posterior measure without glove. Data collection was obtained from June to July 2020 with patients of the PCP. Variables included were demographic data (age and sex), respiratory medical history and suspicion of COVID-19. Descriptive statistics were expressed as frequencies or means with its standard deviation (SD). Effect of gloves was obtained performing Student’s t-test and agreement was determined by Bland-Altman analysis. Data was stratified by age range.Results: 177 patients participated in the intervention, mean age was 58.7 (SD: 18.8) years and 53.7% were female, 19.8% had smoke habit, 18.1% had respiratory medical history and 27.7% were suspicious COVID-19 case. No differences were observed in SpO2 intervention across age groups (p value 0.058 with gloves and 0.150 without). There were statistical significance difference in: patients <50 years (SpO2: +0.65), 50-75 years (SpO2: +0.62), females (SpO2: +0.79), smokers (SpO2: +0.60) and COVID suspicious cases (SpO2: +0.64). Bland-Altman analysis was performed, mean difference was -0.56 ± 1.38% (95% CI, -0.77 to -0.35), and the limits of agreement were -3.32 and 2.19%.Conclusions: The use of powder-free nitrile glove do not change SpO2 with pulse oximetry in general population. However, those patients with potential lung affection might have measures without gloves. Nursing is crucial to educate and prevent from COVID-19 infection.

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