In Vivo 4D X-Ray Dark-Field Lung Imaging in Mice.

Area of Science:

• Medical Imaging
• Pulmonology
• Biophysics

Background:

• X-ray dark-field imaging excels at visualizing lung alveoli due to strong signals.
• Current time-resolved (4D) dark-field imaging is limited by multi-exposure requirements and motion artifacts.

Purpose of the Study:

• To develop and demonstrate the first in vivo 4D X-ray dark-field lung imaging in mice.
• To assess the potential of this technique for functional lung imaging and disease assessment.

Main Methods:

• A single-exposure, grid-based X-ray dark-field imaging approach was synchronized with the respiratory cycle.
• Data acquisition was optimized for minimal motion-blurring and reduced overall scan time.
• Imaging was performed on control mice and mouse models of muco-obstructive disease and lung cancer.

Main Results:

• Successfully achieved in vivo 4D X-ray dark-field lung imaging in mice.
• Demonstrated that 4D dark-field signals provide complementary tomographic information beyond conventional CT.
• Observed and quantified changes in alveolar size and lung expansion during the breath cycle across different lung conditions.

Conclusions:

• This technique enables functional lung imaging by quantifying alveolar changes.
• It offers insights into global and regional lung conditions affecting alveolar size and expansion.
• The method holds promise for assessing lung health and disease progression in preclinical models.