Dynamic In Vivo Chest X-ray Dark-Field Imaging in Mice

Area of Science:

• Biomedical imaging
• Medical physics
• Pulmonary diagnostics

Background:

• X-ray grating interferometry offers advanced imaging modalities beyond conventional X-rays.
• Dark-field imaging shows promise for detecting lung diseases like cancer and emphysema.
• Previous dark-field lung imaging lacked dynamic breath cycle information.

Purpose of the Study:

• To demonstrate the first time-resolved, in vivo dark-field imaging of a complete breath cycle in a mouse lung.
• To visualize dynamic changes in X-ray dark-field, phase, and attenuation signals during respiration.
• To explore the diagnostic potential of breath-resolved dark-field lung imaging.

Main Methods:

• Utilized X-ray grating interferometry for imaging.
• Performed time-resolved, in vivo imaging of a mechanically ventilated mouse.
• Achieved a temporal resolution of 0.1 seconds to capture dynamic lung changes.

Main Results:

• Successfully visualized real-time changes in dark-field, phase, and attenuation images during inhalation and exhalation.
• Demonstrated that the dark-field signal correlates with lung air volume and alveolar dimensions.
• Established the feasibility of dynamic, time-resolved dark-field lung imaging.

Conclusions:

• Time-resolved dark-field imaging provides new insights into lung mechanics and structure during breathing.
• This technique could help optimize imaging parameters for disease diagnosis.
• Dynamic dark-field signals during respiration may offer complementary diagnostic information for lung conditions.