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Multi-modal Pulmonary Imaging: Using Complementary Information from CT and Hyperpolarized 129Xe MRI to Evaluate Lung Structure-Function
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Multiple image x-radiography for functional lung imaging.

G K Aulakh1, A Mann2, G Belev3

  • 1Small Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada.

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Synchrotron X-rays reveal changes in lung optical properties. Multiple image radiography can track lung air-tissue barrier changes during acute lung injury.

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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.