Journal article
Comparison of hyperpolarized 3He-MRI, CT based parametric response mapping, and mucus scores in asthmatics
Frontiers in physiology, Vol.14, 1178339
08/01/2023
DOI: 10.3389/fphys.2023.1178339
PMCID: PMC10431597
PMID: 37593238
Abstract
Purpose:
The purpose of this study was to anatomically correlate ventilation defects with regions of air trapping by whole lung, lung lobe, and airway segment in the context of airway mucus plugging in asthma.
Methods:
A total of 34 asthmatics [13M:21F, 13 mild/moderate, median age (range) of 49.5 (36.8—53.3) years and 21 severe, 56.1 (47.1—62.6) years] and 4 healthy subjects [1M:3F, 38.5 (26.6—52.2) years] underwent HP
3
He MRI and CT imaging. HP
3
He MRI was assessed for ventilation defects using a semi-automated k-means clustering algorithm. Inspiratory and expiratory CTs were analyzed using parametric response mapping (PRM) to quantify markers of emphysema and functional small airways disease (fSAD). Segmental and lobar lung masks were obtained from CT and registered to HP
3
He MRI in order to localize ventilation defect percent (VDP), at the lobar and segmental level, to regions of fSAD and mucus plugging. Spearman’s correlation was utilized to compare biomarkers on a global and lobar level, and a multivariate analysis was conducted to predict segmental fSAD given segmental VDP (sVDP) and mucus score as variables in order to further understand the functional relationships between regional measures of obstruction.
Results:
On a global level, fSAD was correlated with whole lung VDP (
r
= 0.65,
p
< 0.001), mucus score (
r
= 0.55,
p
< 0.01), and moderately correlated (−0.60
≤
r
≤
−0.56,
p
< 0.001) to percent predicted (%p) FEV1, FEF25-75 and FEV1/FVC, and more weakly correlated to FVC%p (−0.38
≤
r
≤
−0.35,
p
< 0.001) as expected from previous work. On a regional level, lobar VDP, mucus scores, and fSAD were also moderately correlated (r from 0.45–0.66,
p
< 0.01). For segmental colocalization, the model of best fit was a piecewise quadratic model, which suggests that sVDP may be increasing due to local airway obstruction that does not manifest as fSAD until more extensive disease is present. sVDP was more sensitive to the presence of a mucus plugs overall, but the prediction of fSAD using multivariate regression showed an interaction in the presence of a mucus plugs when sVDP was between 4% and 10% (
p
< 0.001).
Conclusion:
This multi-modality study in asthma confirmed that areas of ventilation defects are spatially correlated with air trapping at the level of the airway segment and suggests VDP and fSAD are sensitive to specific sources of airway obstruction in asthma, including mucus plugs.
Details
- Title: Subtitle
- Comparison of hyperpolarized 3He-MRI, CT based parametric response mapping, and mucus scores in asthmatics
- Creators
- Katherine J. Carey - University of Wisconsin–MadisonPeter Hotvedt - University of MichiganDavid G. Mummy - Duke UniversityKristine E. Lee - University of Wisconsin–MadisonLoren C. Denlinger - University of Wisconsin–MadisonMark L. Schiebler - University of Wisconsin–MadisonRonald L. Sorkness - University of Wisconsin–MadisonNizar N. Jarjour - University of Wisconsin–MadisonCharles R. Hatt - Imbio (United States)Craig J. Galban - University of MichiganSean B. Fain - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Frontiers in physiology, Vol.14, 1178339
- DOI
- 10.3389/fphys.2023.1178339
- PMID
- 37593238
- PMCID
- PMC10431597
- NLM abbreviation
- Front Physiol
- eISSN
- 1664-042X
- Publisher
- Frontiers Media S.A
- Grant note
- ;
- Language
- English
- Date published
- 08/01/2023
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Radiology; Electrical and Computer Engineering; Iowa Neuroscience Institute; Health, Sport, and Human Physiology
- Record Identifier
- 9984455655902771
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