An Exploratory Study to Characterize Noncontrast CT Derived Lung Perfusion in Patients with COPD

Document Type

Conference Proceeding

Publication Date

5-1-2021

Publication Title

American Journal of Respiratory and Critical Care Medicine

Abstract

Rationale: Loss of pulmonary blood vessel volume and perfusion often occur early in COPD. We have previously shown that pulmonary blood mass dynamics induced by tidal breathing can be quantified from non-contrast CT scans. We have extended this concept to develop a novel CT-Perfusion (CT-P) method for computing the magnitude blood mass changes apparent on dynamic non-contrast CT as a surrogate for pulmonary perfusion. We hypothesize decremental loss in CT-P measured mean magnitude blood mass change (BMC) with increasing COPD severity. Methods: The CT-P method applies image processing and physical modeling to an Inhale/Exhale CT image pair to generate a CT-P image. CT-P characterizes the change in spatial blood mass distribution from inhale to exhale and therefore provides a map of blood flow throughout the lungs. We analyzed 50 random patients from COPDGene study according to Global Initiative on Obstructive Lung Disease (GOLD) staging (10 from each stage). For each patient, BMC scores were calculated as the mean CT-P voxel value taken over the full lung volume. Results: BMC values significantly dropped with increasing GOLD stages (Figure-1). On univariate analysis, Log-BMC scores were significantly lower in self-reported African-American population compared to and Non-Hispanic Whites (95% CI: -0.571, -0.070,p 0.01), and with decreased lung function(FEV1%pred - 95%CI: 0.004, 0.009, p

Volume

203

Issue

9

Comments

Intemational Conference of the American-Thoracic-Society (ATS), May 14-19, 2021.

DOI

10.1164/ajrccm-conference.2021.203.1_MeetingAbstracts.A4576

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