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EJNMMI Research
Published in: EJNMMI Research 1/2020

Open Access 01-12-2020 | Computed Tomography | Original research

Correlation of positron emission tomography ventilation-perfusion matching with CT densitometry in severe emphysema

Authors: Asha Bonney, Carrie-Anne Wagner, Shankar Siva, Jason Callahan, Pierre-Yves Le Roux, Diane M. Pascoe, Louis Irving, Michael S. Hofman, Daniel P. Steinfort

Published in: EJNMMI Research | Issue 1/2020

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Abstract

Background

Emphysema severity is frequently measured on CT via densitometry. Correlation with scintigraphic and spirometric functional measures of ventilation or perfusion varies widely, and no prior study has evaluated correlation between densitometry and lobar ventilation/perfusion in patients with severe emphysema. The aim of this study was to evaluate the utility and findings of gallium-68 (68Ga) ventilation/perfusion positron emission tomography-CT (68Ga-VQ/PET-CT) in severe emphysema assessment.

Methods

Fourteen consecutive patients undergoing evaluation for bronchoscopic lung volume reduction between March 2015 and March 2018 underwent 68Ga-VQ/PET-CT assessment for lobar functional lung mapping, in addition to CT densitometry. Correlations between CT densitometry and 68Ga-VQ/PET-CT parameters for individual lobar lung function were sought.

Results

CT densitometry assessment of emphysema correlated only weakly (R2 = 0.13) with lobar perfusion and was not correlated with ventilation (R2 = 0.04). Densitometry was moderately (R2 = 0.67) correlated with V/Q units in upper lobes, though poorly reflected physiological function in lower lobes (R2 = 0.19). Emphysema severity, as measured by CT densitometry, was moderately correlated with proportion of normal V/Q units and matched V/Q defects in individual lobes.

Conclusions

Assessment of lobar pulmonary function by 68Ga-VQ/PET-CT provides physiologic information not evident on CT densitometry such as ventilation and perfusion specifics and matched defects. Further research is needed to see if the discordant findings on 68Ga-VQ/PET-CT provide prognostic information or can be used to modify patient management and improve outcomes.
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Metadata
Title
Correlation of positron emission tomography ventilation-perfusion matching with CT densitometry in severe emphysema
Authors
Asha Bonney
Carrie-Anne Wagner
Shankar Siva
Jason Callahan
Pierre-Yves Le Roux
Diane M. Pascoe
Louis Irving
Michael S. Hofman
Daniel P. Steinfort
Publication date
01-12-2020
Publisher
Springer Berlin Heidelberg
Published in
EJNMMI Research / Issue 1/2020
Electronic ISSN: 2191-219X
DOI
https://doi.org/10.1186/s13550-020-00672-8

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