Strain analysis based on dynamic ventilation computed tomography in fibrotic interstitial lung disease and its...

Area of Science:

• Pulmonary Medicine
• Radiology
• Medical Imaging

Background:

• Fibrotic interstitial lung disease (fILD) is a progressive lung condition causing reduced elasticity and restrictive ventilatory impairment.
• Dynamic ventilation computed tomography (DVCT) strain analysis quantifies lung deformation, offering a novel method to monitor lung pathophysiology.
• Understanding regional lung motion abnormalities is crucial for managing fILD.

Purpose of the Study:

• To quantitatively identify abnormal lung motion in fILD patients using strain analysis.
• To correlate strain metrics with spirometric indices in fILD.
• To assess the utility of DVCT-derived strain in evaluating regional mechanical impairment.

Main Methods:

• 27 fILD patients and 20 healthy controls underwent DVCT scanning.
• Strain metrics were computed across nine axial lung levels using computational fluid dynamics software.
• Pearson correlations assessed associations between strain metrics, lung fibrosis percentage, and pulmonary function parameters.

Main Results:

• Lung strain exhibited heterogeneous temporal and spatial distributions, with significant differences between lung regions in both groups.
• fILD patients showed consistently lower strain values compared to significantly higher values in healthy controls.
• Strain parameters strongly correlated with forced expiratory volume, forced vital capacity, and total lung capacity.

Conclusions:

• DVCT-derived strain analysis provides a quantitative measure of abnormal regional lung motion in fILD.
• This technique complements spirometry by capturing local ventilatory mechanics.
• Strain analysis shows promise for evaluating regional mechanical impairment in fibrotic lung diseases.