Reliability and Precision of in Vivo Scapular Kinematic Measurements Using an Electromagnetic Tracking Device

2006 ◽  
Vol 15 (2) ◽  
pp. 125-143 ◽  
Author(s):  
Joseph Myers ◽  
John Jolly ◽  
Takashi Nagai ◽  
Scott Lephart
Keyword(s):  
Outcome Measures ◽  
High Reliability ◽  
Intraclass Correlation ◽  
Human Movement ◽  
Published Data ◽  
Electromagnetic Tracking ◽  
Scapular Kinematics ◽  
The Mean ◽  
Tracking Device

Context:In vivo scapular kinematics during humeral movements are commonly assessed with electromagnetic tracking devices despite few published data related to reliability and precision of these measurements.Objective:To determine the intrasession reliability and precision of assessing scapular kinematics using an electromagnetic tracking device.Design:Scapular position and orientation were measured with an electromagnetic tracking device during humeral elevation/depression in several planes. Intrasession reliability and precision were established by comparing 2 trials performed in succession.Setting:A human-movement research laboratory.Participants:15 healthy individuals.Main Outcome Measures:Intrasession intraclass correlation coefficients and standard error of measurement of all scapular variables were established.Results:The mean intrasession reliability for all variables was ICC = .97 ± .03. The mean intrasession precision was .99° ± .36°.Conclusions:In vivo scapular kinematics can be measured with high reliability and precision during intrasession research designs.

scholarly journals In Vitro and In Vivo Assessment of a New Workflow for the Acquisition of Mandibular Kinematics Based on Portable Tracking System with Passive Optical Reflective Markers

2021 ◽  
Vol 11 (9) ◽  
pp. 3947
Author(s):  
Marco Farronato ◽  
Gianluca M. Tartaglia ◽  
Cinzia Maspero ◽  
Luigi M. Gallo ◽  
Vera Colombo
Keyword(s):  
Measurement Error ◽  
Tracking System ◽  
Intraclass Correlation ◽  
Optical Tracking ◽  
Optical Tracking System ◽  
Rater Reliability ◽  
Tracking Device ◽  
Mandibular Kinematics

Clinical use of portable optical tracking system in dentistry could improve the analysis of mandibular movements for diagnostic and therapeutic purposes. A new workflow for the acquisition of mandibular kinematics was developed. Reproducibility of measurements was tested in vitro and intra- and inter-rater repeatability were assessed in vivo in healthy volunteers. Prescribed repeated movements (n = 10) in three perpendicular directions of the tracking-device coordinate system were performed. Measurement error and coefficient of variation (CV) among repetitions were determined. Mandibular kinematics of maximum opening, left and right laterality, protrusion and retrusion of five healthy subjects were recorded in separate sessions by three different operators. Obtained records were blindly examined by three observers. Intraclass correlation coefficient (ICC) was calculated to estimate inter-rater and intra-rater reliability. Maximum in vitro measurement error was 0.54 mm and CV = 0.02. Overall, excellent intra-rater reliability (ICC > 0.90) for each variable, general excellent intra-rater reliability (ICC = 1.00) for all variables, and good reliability (ICC > 0.75) for inter-rater tests were obtained. A lower score was obtained for retrusion with “moderate reliability” (ICC = 0.557) in the inter-rater tests. Excellent repeatability and reliability in optical tracking of primary movements were observed using the tested portable tracking device and the developed workflow.

scholarly journals Quantification of [11C]PIB PET for Imaging Myelin in the Human Brain: A Test—Retest Reproducibility Study in High-Resolution Research Tomography

2015 ◽  
Vol 35 (11) ◽  
pp. 1771-1782 ◽  
Author(s):  
Mattia Veronese ◽  
Benedetta Bodini ◽  
Daniel García-Lorenzo ◽  
Marco Battaglini ◽  
Salvatore Bongarzone ◽  
...  
Keyword(s):  
High Resolution ◽  
High Reliability ◽  
Intraclass Correlation ◽  
Volume Ratio ◽  
Reference Region ◽  
Brain White Matter ◽  
Reproducibility Study ◽  
Pet Tracer ◽  
Positron Emission

An accurate in vivo measure of myelin content is essential to deepen our insight into the mechanisms underlying demyelinating and dysmyelinating neurological disorders, and to evaluate the effects of emerging remyelinating treatments. Recently [11C]PIB, a positron emission tomography (PET) tracer originally conceived as a beta-amyloid marker, has been shown to be sensitive to myelin changes in preclinical models and humans. In this work, we propose a reference-region methodology for the voxelwise quantification of brain white-matter (WM) binding for [11C]PIB. This methodology consists of a supervised procedure for the automatic extraction of a reference region and the application of the Logan graphical method to generate distribution volume ratio (DVR) maps. This approach was assessed on a test–retest group of 10 healthy volunteers using a high-resolution PET tomograph. The [11C]PIB PET tracer binding was shown to be up to 23% higher in WM compared with gray matter, depending on the image reconstruction. The DVR estimates were characterized by high reliability (outliers < 1%) and reproducibility (intraclass correlation coefficient (ICC) > 0.95). [11C]PIB parametric maps were also found to be significantly correlated ( R2 > 0.50) to mRNA expressions of the most represented proteins in the myelin sheath. On the contrary, no correlation was found between [11C]PIB imaging and nonmyelin-associated proteins.

Determining Dual Euler Angles of the Ankle Complex in vivo Using “Flock of Birds” Electromagnetic Tracking Device

2005 ◽  
Vol 127 (1) ◽  
pp. 98-107 ◽  
Author(s):  
Ning Ying ◽  
Wangdo Kim
Keyword(s):  
Three Dimensional ◽  
Euler Angles ◽  
Joint Motion ◽  
Electromagnetic Tracking ◽  
Kinematic Coupling ◽  
Alternative Approach ◽  
Ankle Complex ◽  
Coupling Characteristics ◽  
Tracking Device

The dual Euler angles method has been proposed as an alternative approach to describe the general spatial human joint motion. In this study, the dual Euler angles method was applied to study the three-dimensional motion of the ankle complex. The methodology for obtaining dual Euler angles of the ankle complex was developed by using a “Flock of Birds” electromagnetic tracking device. The repeatability of the methodology was studied based on the intertester and intratester variability analysis. Finally kinematic coupling characteristics of the ankle complex during dorsiflexion–plantarflexion, eversion–inversion, and abduction–adduction were analyzed according to the parameters of the dual Euler angles.

Reliability And Precision Of In-vivo Scapular Kinematic Measurements Using An Electromagnetic Tracking Device

2005 ◽  
Vol 37 (Supplement) ◽  
pp. S120
Author(s):  
Joseph Myers ◽  
John Jolly ◽  
Takashi Nagai ◽  
Scott Lephart
Keyword(s):  
Electromagnetic Tracking ◽  
Tracking Device

scholarly journals Can the ARAT be Used to Measure Arm Function in People With Cerebellar Ataxia?

2020 ◽  
Author(s):  
Rachel Reoli ◽  
Kendra Cherry-Allen ◽  
Amanda Therrien ◽  
Jennifer Keller ◽  
Kristan Leech ◽  
...  
Keyword(s):  
Construct Validity ◽  
Outcome Measures ◽  
Interrater Reliability ◽  
Outcome Measure ◽  
High Reliability ◽  
Intraclass Correlation ◽  
Activity Level ◽  
Activity Limitations ◽  
Neurological Conditions ◽  
Moderate Relationship

Abstract Objective For people with ataxia, there are validated outcome measures to address body function and structure (BFS) impairments and participation; however, no outcome measure exists for upper extremity (UE) activity level in this population. The purpose of this study was to determine whether the Action Research Arm Test (ARAT), a measure of UE activity validated for other neurological conditions, might be a useful outcome measure for capturing UE activity limitations in ataxia. Methods Twenty-two participants with ataxia were evaluated to assess construct validity of the ARAT; 19 of the participants were included in the interrater reliability assessment. Participants received a neurologic examination and completed a battery of outcome measures, including the ARAT. ARAT performance was video recorded and scored by 4 additional raters. Results For construct validity, Spearman rho showed a significant moderate relationship between the ARAT and BSF outcome measures. A small, nonsignificant relationship was noted for the ARAT and the participation measure. For interrater reliability, Spearman rho showed a large, significant relationship among all raters for the ARAT (range = 0.87–0.94). High reliability was demonstrated using the intraclass correlation coefficient (ICC [2,1]) = .97). Conclusion The ARAT is moderately correlated with ataxia BFS outcome measures, but not with participation scores. The ARAT is a measure of UE activity, which is different from BFS and participation outcome measures. The ARAT was identified to have strong interrater reliability among raters with varying amounts of experience administering the ARAT. Thus, for the ataxic population, the ARAT may be useful for assessing UE activity limitations. Impact Ataxia can negatively affect reaching tasks; therefore, it is important to assess UE activity level in people with ataxia. Until this study, no outcome measure had been identified for this purpose.

scholarly journals A New Predictive Equation for Estimating Body Weight in Cirrhotic Patients With Refractory Ascites

2021 ◽  
Vol 5 (Supplement_2) ◽  
pp. 868-868
Author(s):  
Bruna Alves ◽  
Moiséli da Cruz ◽  
Antonio Lopes ◽  
Camila Saueressig ◽  
Valesca Dall'Alba
Keyword(s):  
High Reliability ◽  
Intraclass Correlation ◽  
Dry Weight ◽  
Joint Effect ◽  
Prediction Equation ◽  
Cross Sectional Study ◽  
Refractory Ascites ◽  
Decompensated Cirrhosis ◽  
Cross Sectional ◽  
The Mean

Abstract Objectives This study aims to develop a new prediction equation to estimate the dry weight (DW) of patients with refractory cirrhotic ascites since there is a lack of evidence to substantiate the current values used to adjust the wet weight in these patients. Methods Cross-sectional study, that included patients with decompensated cirrhosis undergoing large-volume paracentesis. Height (H) was measured and weight, immediately before and after paracentesis. For the prediction of DW, a linear regression model was performed using as predictor variables: gender, H, and pre-paracentesis weight (preW), as response variable: post-paracentesis weight (postW). Three-way interaction was used to test the joint effect of these predictors. The capacity of this model to predict the postW was evaluated by comparing it with the currently used predictions through the intraclass correlation coefficient (ICC) and the mean square error (MSE). Results Twenty patients were included, 16 were male. Moderate ascites was the most prevalent grade (n = 18). The mean (range) of ascitic fluid drained was 6.6 (0.45 – 16.0) L, and the difference of Wpre and Wpost was −6.8 (−0.7 – −15.7) kg. The prediction equation developed for estimating DW in male is: DW = −11.4 + 1.2 * Wpre + 0.125 * H −0.002 * Wpre * H, and in female: DW = −40.6 + 1.2 * Wpre + 0.331 * H −0.030 * Wpre * H. ICC values showed that all predictions measures were strongly correlated (r &gt; 0.95). In comparison with current predictions, our model showed the highest ICC (r = 0.97) and the lowest MSE ( = 7.70), comparing with the current predictions (MSE = 18.63, when the preW is adjusted from absolute values and MSE = 12.75 when adjusted from percentage values), indicating more accurate prediction. Conclusions This new prediction equation showed high reliability as a weight adjustment tool for patients with refractory cirrhotic ascites. Further research is required to validate this prediction equation. Funding Sources Fundo de Incentivo à Pesquisa e Eventos (FIPE) from Hospital de Clínicas de Porto Alegre and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) from Ministry of Education of Brazil.

Reliability And Precision Of In-vivo Scapular Kinematic Measurements Using An Electromagnetic Tracking Device

2005 ◽  
Vol 37 (Supplement) ◽  
pp. S120
Author(s):  
Joseph Myers ◽  
John Jolly ◽  
Takashi Nagai ◽  
Scott Lephart
Keyword(s):  
Electromagnetic Tracking ◽  
Tracking Device

Reliability of strain elastography using in vivo compression in the assessment of the uterine cervix during pregnancy

2020 ◽  
Vol 48 (3) ◽  
pp. 256-265 ◽  
Author(s):  
Dong Wook Kwak ◽  
Mina Kim ◽  
Soo-young Oh ◽  
Hyun Soo Park ◽  
Sa Jin Kim ◽  
...  
Keyword(s):  
Observational Study ◽  
Confidence Interval ◽  
Prospective Observational Study ◽  
Intraclass Correlation ◽  
Cervical Length ◽  
Strain Elastography ◽  
The Mean ◽  
Cervical Area ◽  
Mean Strain

AbstractObjectiveTo determine the reproducibility of the mean strain value in various cervical areas and new elastographic parameters for measuring cervical stiffness evaluated by strain elastography using in vivo compression generated by internal organ movement.MethodsA prospective observational study (140 singleton pregnant women; 15–33 weeks of gestation) was performed at two tertiary centers. Cervical strain was evaluated using E-cervix™ elastography. The mean strain levels of various cervical areas [internal os (IOS), external os (EOS) and endocervical area] and several new parameters [i.e. the ratio of the strain level of IOS and EOS, elasticity contrast index (ECI), and hardness ratio] were assessed twice by two independent examiners. The inter-observer and intra-observer variances were calculated using the intraclass correlation coefficient (ICC) with a 95% confidence interval (CI). Bland-Altman (B-A) analysis was also performed.ResultsThe median gestational age was 24.0 weeks, and the mean cervical length (CL) was 3.8 cm. The intra-observer and inter-observer ICCs of the mean strain levels of the specified cervical area and new elastographic parameters were statistically significant (P < 0.001, all); the intra-observer ICC was 0.639–0.725, and the inter-observer ICC was 0.538–0.718.ConclusionThe reproducibility of elastographic parameter measurements using in vivo compression is improvable.

scholarly journals The reliability and heritability of cortical folds and their genetic correlations across hemispheres

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Fabrizio Pizzagalli ◽  
Guillaume Auzias ◽  
Qifan Yang ◽  
Samuel R. Mathias ◽  
Joshua Faskowitz ◽  
...  
Keyword(s):  
High Reliability ◽  
Large Population ◽  
Intraclass Correlation ◽  
Genetic Correlations ◽  
Complex Trait ◽  
Total N ◽  
Human Cortex ◽  
Variance Components Analysis ◽  
Family Based

AbstractCortical folds help drive the parcellation of the human cortex into functionally specific regions. Variations in the length, depth, width, and surface area of these sulcal landmarks have been associated with disease, and may be genetically mediated. Before estimating the heritability of sulcal variation, the extent to which these metrics can be reliably extracted from in-vivo MRI must be established. Using four independent test-retest datasets, we found high reliability across the brain (intraclass correlation interquartile range: 0.65–0.85). Heritability estimates were derived for three family-based cohorts using variance components analysis and pooled (total N > 3000); the overall sulcal heritability pattern was correlated to that derived for a large population cohort (N > 9000) calculated using genomic complex trait analysis. Overall, sulcal width was the most heritable metric, and earlier forming sulci showed higher heritability. The inter-hemispheric genetic correlations were high, yet select sulci showed incomplete pleiotropy, suggesting hemisphere-specific genetic influences.

Sex-Related Differences in Scapular Kinematics During Elevation of the Arm in Asymptomatic Children and Adults

2016 ◽  
Vol 32 (5) ◽  
pp. 513-519 ◽  
Author(s):  
Fernanda Assis Paes Habechian ◽  
Dayana Patricia Rosa ◽  
Melina Nevoeiro Haik ◽  
Paula Rezende Camargo
Keyword(s):  
Three Dimensional ◽  
Comprehensive Analysis ◽  
Electromagnetic Tracking ◽  
Scapular Kinematics ◽  
Tilted Position ◽  
Asymptomatic Children ◽  
Arm Elevation ◽  
Tracking Device ◽  
Dominant Side

Recently, it has been suggested that sex may influence scapular kinematics. A more comprehensive analysis of the scapular kinematics in children and adults, including sex as a factor, will help to understand if differences between sexes are present since childhood. The purpose of this study was to compare scapular kinematics between sex in children and adults during elevation of the arm. One-hundred and sixteen asymptomatic adults (58 men and 58 women) and 53 children (28 boys and 25 girls) participated in the study. Three-dimensional scapular kinematics during elevation of the arm were obtained using an electromagnetic tracking device. Women had a more upwardly rotated scapula in the nondominant side (P < .05), with large effects and a more anteriorly tilted position at 60°, 90°, and 120° of arm elevation in the dominant side, and at 90° and 120° in the nondominant side (P < .05) with moderate effects when compared with men. Differences between sexes were not found in the children (P > .05). In conclusion, sex seems to influence scapular kinematics in adulthood, but not in childhood.

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