High-resolution computed tomography of the pig lung

Area of Science:

• Veterinary Radiology
• Comparative Anatomy
• Pulmonary Imaging

Background:

• Accurate radiologic-pathologic correlation is crucial for understanding lung diseases.
• The Yorkshire pig is a common animal model in biomedical research.
• Detailed understanding of normal and pathological lung anatomy in animal models is essential for imaging studies.

Purpose of the Study:

• To perform a computed tomographic (CT)-anatomic correlation of the lung in young Yorkshire pigs.
• To establish the normal pulmonary anatomy in this model using CT, bronchography, and arteriography.
• To evaluate the pig lung as a model for radiologic-pathologic correlation, particularly for airspace disease.

Main Methods:

• In vivo CT scans were performed on young Yorkshire pigs.
• Lungs were explanted, fixed, dried, and studied with CT, bronchography, and arteriography.
• Specimens were sliced at CT levels, with histology performed as needed.
• Standard and bone detail algorithms were used for CT analysis.

Main Results:

• Yorkshire pig lungs exhibit well-demarcated lobules and uniform sublobular units.
• In vivo CT with standard algorithm visualized pulmonary artery and bronchus branches to segmental bronchi.
• The bone detail algorithm enhanced visualization of vessels and lobar bronchi.
• Lobular demarcations were not visible in normal pig lungs but were apparent in pulmonary edema.
• Sublobular units and bronchi (0.5-0.7 mm) were appreciated in pulmonary edema cases.

Conclusions:

• The Yorkshire pig lung, with its well-developed lobules and uniform sublobular units, serves as a suitable model for radiologic-pathologic correlation.
• CT imaging, particularly with specific algorithms, can effectively delineate pulmonary structures.
• The model is especially promising for the study of pulmonary edema and other airspace diseases.