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• W2102007193 abstract "Purpose To compare manual measurements of diameter, volume, and mass of pulmonary ground-glass nodules (GGNs) to establish which method is best for identifying malignant GGNs by determining change across time. Materials and Methods In this ethics committee–approved retrospective study, baseline and follow-up CT examinations of 52 GGNs detected in a lung cancer screening trial were included, resulting in 127 GGN data sets for evaluation. Two observers measured GGN diameter with electronic calipers, manually outlined GGNs to obtain volume and mass, and scored whether a solid component was present. Observer 1 repeated all measurements after 2 months. Coefficients of variation and limits of agreement were calculated by using Bland-Altman methods. In a subgroup of GGNs containing all resected malignant lesions, the ratio between intraobserver variability and growth (growth-to-variability ratio) was calculated for each measurement technique. In this subgroup, the mean time for growth to exceed the upper limit of agreement of each measurement technique was determined. Results The κ values for intra- and interobserver agreement for identifying a solid component were 0.55 and 0.38, respectively. Intra- and interobserver coefficients of variation were smallest for GGN mass (P < .001). Thirteen malignant GGNs were resected. Mean growth-to-variability ratios were 11, 28, and 35 for diameter, volume, and mass, respectively (P = .03); mean times required for growth to exceed the upper limit of agreement were 715, 673, and 425 days, respectively (P = .02). Conclusion Mass measurements can enable detection of growth of GGNs earlier and are subject to less variability than are volume or diameter measurements. © RSNA, 2010" @default.
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• W2102007193 date "2010-04-01" @default.
• W2102007193 modified "2023-09-26" @default.
• W2102007193 title "Pulmonary Ground-Glass Nodules: Increase in Mass as an Early Indicator of Growth" @default.
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• W2102007193 doi "https://doi.org/10.1148/radiol.09090571" @default.
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