\n\nMethods: A Storz 7200 bronchoscope was used to obtain video of a standardized tube. The images were then processed using “open source” tools which detected feature points. A three dimensional model was then constructed using these feature points. An in-house 3D image program was then used to compare the 3D model with the standardized tube. Video from a representative airway patient who had previously had a CT of the chest and a bronchoscopic examination was also analyzed

using this technique. The see more 3D model was correlated with CT images to clinically validate this technique.\n\nSetting: Tertiary care hospital.\n\nPatients: One airway patient video was used for clinical validation.\n\nOutcome measures: (1) Average diameters of the 3D video derived tube model were compared to the actual tube and (2) a cross section of the 3D video derived patient model was compared to the patient CT derived model.\n\nResults: Repeated measures on standardized tubes demonstrated that is it possible to construct an airway model using this novel technique with a less than 5% error. Further, it is possible to construct a 3D model from patient video using existing brochoscopic technology.\n\nConclusions: It is possible to extract 3D data from a sequence

of 2D images. Further, this 3D model can be used for the purposes of management and planning and is quantitatively accurate and reliable. Initial data suggests that these measurements correlate with actual airway size and may provide RG-7112 concentration a better instrument with which to make surgical https://www.selleckchem.com/products/AZD0530.html decisions. (c) 2009 Elsevier Ireland Ltd. All rights reserved.”
“Objectives: To evaluate the agreement and the association with FEV(1), FEV(6) and FEV(1)/FEV(6) measured with the Vitalograph-COPD-6

portable device and the FEV(1), FVC and FEV(1)/FVC by conventional spirometry, and to analyse the validity of this device to detect obstruction.\n\nMethodology: A cross-sectional, descriptive, prospective study, that included 180 subjects. A conventional spirometry and one with the Vitalograph-COPD-6 were sequentially performed on them. The agreement was analysed [kappa index and interclass correlation coefficient (ICC)], as well as the association [Pearson correlation coefficient (r)] area under the ROC curve (AUC) of the FEV(1)/FEV(6) in detecting obstruction, and the sensitivity, specificity, predictive values (PPV and NPV), and probability ratios (PR+ and PR-) of the different FEV(1)/FEV(6) cut-off points in the detection of obstruction.\n\nResults: The prevalence of obstruction was 47%. The kappa index was 0.59 when an FEV(1)/FEV(6) < cut-off point of <0.7 was used. The ICC and the r between the FEV(1) measured by the two instruments, FEV(6) and FEV(1)/FEV(6) measured by the Vitalograph-COPD-6 and the FVC and FEV(1)/FVC determined by the spirometer were all greater than 0.92. The ROC AUC was 0.97. To detect obstruction, if the cut-off point of FEV(1)/FEV(6) (for COPD-6) was <0.70.