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La radiologia medica
Published in: La radiologia medica 4/2021

01-04-2021 | COVID-19 | Chest Radiology

COVID-19 pneumonia: computer-aided quantification of healthy lung parenchyma, emphysema, ground glass and consolidation on chest computed tomography (CT)

Authors: Roberto Grassi, Maria Paola Belfiore, Alessandro Montanelli, Gianluigi Patelli, Fabrizio Urraro, Giuliana Giacobbe, Roberta Fusco, Vincenza Granata, Antonella Petrillo, Palmino Sacco, Maria Antonietta Mazzei, Beatrice Feragalli, Alfonso Reginelli, Salvatore Cappabianca

Published in: La radiologia medica | Issue 4/2021

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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 < < 0.01). There were differences statistically significant among the groups based on radiological severity score in terms of healthy residual parenchyma volume, of GGO volume and of consolidations volume (p < < 0.001).

Conclusion

We demonstrated that, using a computer-aided tool, the COVID-19 pneumonia was mirrored with a percentage median value of GGO of 19.50% and that only GGO volume had a difference significant between the patients with suspected or non-suspected CT for COVID-19 infection.
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Metadata
Title
COVID-19 pneumonia: computer-aided quantification of healthy lung parenchyma, emphysema, ground glass and consolidation on chest computed tomography (CT)
Authors
Roberto Grassi
Maria Paola Belfiore
Alessandro Montanelli
Gianluigi Patelli
Fabrizio Urraro
Giuliana Giacobbe
Roberta Fusco
Vincenza Granata
Antonella Petrillo
Palmino Sacco
Maria Antonietta Mazzei
Beatrice Feragalli
Alfonso Reginelli
Salvatore Cappabianca
Publication date
01-04-2021
Publisher
Springer Milan
Published in
La radiologia medica / Issue 4/2021
Print ISSN: 0033-8362
Electronic ISSN: 1826-6983
DOI
https://doi.org/10.1007/s11547-020-01305-9

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