Correcting Nonpathological Variation in Longitudinal Parametric Response Maps of CT Scans in COPD Subjects: SPIROMICS.

MS#: 
MS097
TitleCorrecting Nonpathological Variation in Longitudinal Parametric Response Maps of CT Scans in COPD Subjects: SPIROMICS.
Publication TypePublication
Year2017
AuthorsFernández-Baldera A, Hatt CR, Murray S, Hoffman EA, Kazerooni EA, Martinez FJ, Han MK, Galbán CJ
JournalTomography
Volume3
Issue3
Pagination138-145
Date Published2017 Sep
ISSN2379-1381
Abstract

Small airways disease (SAD) is one of the leading causes of airflow limitations in patients diagnosed with chronic obstructive pulmonary disease (COPD). Parametric response mapping (PRM) of computed tomography (CT) scans allows for the quantification of this previously invisible COPD component. Although PRM is being investigated as a diagnostic tool for COPD, variability in the longitudinal measurements of SAD by PRM has been reported. Here, we show a method for correcting longitudinal PRM data because of non-pathological variations in serial CT scans. In this study, serial whole-lung high-resolution CT scans over a 30-day interval were obtained from 90 subjects with and without COPD accrued as part of SPIROMICS. It was assumed in all subjects that the COPD did not progress between examinations. CT scans were acquired at inspiration and expiration, spatially aligned to a single geometric frame, and analyzed using PRM. By modeling variability in longitudinal CT scans, our method could identify, at the voxel-level, shifts in PRM classification over the 30-day interval. In the absence of any correction, PRM generated serial percent volumes of functional SAD with differences as high as 15%. Applying the correction strategy significantly mitigated this effect with differences ~1%. At the voxel-level, significant differences were found between baseline PRM classifications and the follow-up map computed with and without correction ( <. 01 over GOLD). This strategy of accounting for nonpathological sources of variability in longitudinal PRM may improve the quantification of COPD phenotypes transitioning with disease progression.

DOI10.18383/j.tom.2017.00013
Alternate JournalTomography
PubMed ID29457137
PubMed Central IDPMC5812694
Grant ListHHSN268200900019C / HL / NHLBI NIH HHS / United States
HHSN268200900015C / HL / NHLBI NIH HHS / United States
HHSN268200900016C / HL / NHLBI NIH HHS / United States
U01 HL137880 / HL / NHLBI NIH HHS / United States
R01 HL122438 / HL / NHLBI NIH HHS / United States
R44 HL118837 / HL / NHLBI NIH HHS / United States
HHSN268200900018C / HL / NHLBI NIH HHS / United States
HHSN268200900017C / HL / NHLBI NIH HHS / United States
HHSN268200900020C / HL / NHLBI NIH HHS / United States
HHSN268200900013C / HL / NHLBI NIH HHS / United States
HHSN268200900014C / HL / NHLBI NIH HHS / United States
K24 HL138188 / HL / NHLBI NIH HHS / United States
Manuscript Lead/Corresponding Author Affiliation: 
Clinical Center: Michigan (University of Michigan)
ECI: 
Manuscript Status: 
Published and Public