Multiple image x-radiography for functional lung imaging

Area of Science:

• Medical Imaging
• Pulmonary Research
• Biophysics

Background:

• Lung imaging is challenging due to air predominance.
• X-ray refraction at air-tissue interfaces can create contrast.
• Quantifying lung optical properties offers insights into lung function.

Purpose of the Study:

• To quantify changes in lung optical properties using synchrotron X-rays.
• To assess the impact of bacterial endotoxin on lung optical properties.
• To evaluate the utility of multiple image radiography in tracking lung pathologies.

Main Methods:

• Utilized multiple image radiography (a variant of diffraction enhanced imaging) at the Canadian Light Source.
• Quantified X-ray attenuation, refraction, and ultra-small angle scatter (USAXS) contrast ratios.
• Studied these properties in mice under different respiratory conditions and after lipopolysaccharide instillation.

Main Results:

• Ultra-small angle scatter and attenuation contrast ratios increased significantly 9 hours post-lipopolysaccharide instillation.
• Refraction contrast decreased in magnitude after lipopolysaccharide instillation.
• End-expiratory pressures increased ultra-small angle scatter contrast ratio compared to end-inspiratory pressures.

Conclusions:

• Multiple image radiography can effectively quantify changes in lung optical properties.
• This technique shows promise for monitoring lung pathologies like acute lung injury.
• X-ray optical properties provide valuable information about the lung air-tissue barrier over time.