Radiation-induced lung injury using a pig model. Evaluation by high-resolution computed tomography

Area of Science:

• Radiology
• Pulmonary Medicine
• Experimental Pathology

Background:

• Radiation therapy can cause lung injury, impacting patient outcomes.
• Early detection of radiation-induced lung injury (RILI) is crucial for management.
• High-resolution computed tomography (CT) is a key imaging modality for lung assessment.

Purpose of the Study:

• To evaluate early-phase radiation-induced lung injury (RILI) using high-resolution CT in an experimental model.
• To establish precise correlations between CT findings and pathological changes in the lung.
• To validate the utility of high-resolution CT in assessing RILI.

Main Methods:

• Five Yorkshire pigs were subjected to a single 12.5 Gy radiation dose to the right lower lung.
• High-resolution CT scans were performed bi-weekly for up to 16 weeks.
• Post-mortem lung examination included specimen radiography and detailed histologic analysis for radiologic-pathologic correlation.

Main Results:

• CT revealed various findings including ground-glass opacity, consolidation, and thickened septa/bronchovascular bundles within 16 weeks.
• Ground-glass opacity correlated with thickened alveolar walls and fibrotic foci.
• Consolidation corresponded to intra-alveolar edema, hemorrhage, and inflammatory cell infiltration.

Conclusions:

• High-resolution CT demonstrated a strong correlation with the pathological findings of radiation-induced lung injury.
• Precise radiologic-pathologic correlation validates the effectiveness of high-resolution CT in characterizing early RILI.
• This study supports the use of high-resolution CT for monitoring and understanding lung damage post-radiation.