COVID-19 pneumonia: computer-aided quantification of healthy lung parenchyma, emphysema, ground glass and consolidation
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CHEST RADIOLOGY
COVID‑19 pneumonia: computer‑aided quantification of healthy lung parenchyma, emphysema, ground glass and consolidation on chest computed tomography (CT) Roberto Grassi1 · Maria Paola Belfiore1 · Alessandro Montanelli2 · Gianluigi Patelli3 · Fabrizio Urraro1 · Giuliana Giacobbe1 · Roberta Fusco4 · Vincenza Granata4 · Antonella Petrillo4 · Palmino Sacco5 · Maria Antonietta Mazzei5 · Beatrice Feragalli6 · Alfonso Reginelli1 · Salvatore Cappabianca1 Received: 21 June 2020 / Accepted: 29 October 2020 © Italian Society of Medical Radiology 2020
Abstract Objective To calculate by means of a computer-aided tool the volumes of healthy residual lung parenchyma, of emphysema, of ground glass opacity (GGO) and of consolidation on chest computed tomography (CT) in patients with suspected viral pneumonia by COVID-19. Materials and methods This study included 116 patients that for suspected COVID-19 infection were subjected to the reverse transcription real-time fluorescence polymerase chain reaction (RT-PCR) test. A computer-aided tool was used to calculate on chest CT images healthy residual lung parenchyma, emphysema, GGO and consolidation volumes for both right and left lung. Expert radiologists, in consensus, assessed the CT images using a structured report and attributed a radiological severity score at the disease pulmonary involvement using a scale of five levels. Nonparametric test was performed to assess differences statistically significant among groups. Results GGO was the most represented feature in suspected CT by COVID-19 infection; it is present in 102/109 (93.6%) patients with a volume percentage value of 19.50% and a median value of 0.64 L, while the emphysema and consolidation volumes were low (0.01 L and 0.03 L, respectively). Among quantified volume, only GGO volume had a difference statistically significant between the group of patients with suspected versus non-suspected CT for COVID-19 (p
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