Density-based MDCT quantification of lobar lung volumes: a study of inter- and intraobserver reproducibility Quantificazione dei volumi polmonari lobari attraverso la TC multidetettore: studio di riproducibilità inter- ed intra-osservatore

Purpose. The authors assessed the reproducibility of multidetector-row computed tomography (MDCT) volumetry of the total and emphysematous parenchyma of pulmonary lobes. Materials and methods. Two observers analyzed 23 MDCT examinations of patients with emphysema during two sessions held 3 months apart. Both lungs and all lobes were delimited by a combination of semiautomated and manual segmentation. Emphysematous parenchyma was obtained by applying density thresholds of ‐1,024/‐950 HU. To assess the reproducibility of total volume (V), volume of emphysema (VE) and emphysema index (EI), intra- and interobserver differences of those measurements were assessed.