Assessing cerebral capillary function and stalling using single capillary reporters in ultrasound localization...

Area of Science:

• Neuroimaging
• Vascular Biology
• Biomedical Engineering

Background:

• Transcranial neuroimaging of individual capillary function is crucial for diagnostics but technically challenging.
• Current superresolution ultrasound methods are limited by low microbubble event probability in capillaries.

Purpose of the Study:

• To introduce a novel method, single capillary reporters (SCaRe), for direct imaging of single capillaries.
• To enable transcranial functional assessment of deep capillary networks in the brain.

Main Methods:

• Utilizing complete flow trajectory information from individual microbubbles to image single capillaries.
• Employing computational simulations and pathological neuroinflammation models for validation.
• Quantifying metrics like capillary transit-time and capillary stalling.

Main Results:

• Demonstrated SCaRe's capability for non-invasive, single-capillary resolution imaging.
• Successfully quantified capillary function metrics in simulated and pathological models.
• Resolved immune responses to injury at the single capillary level.

Conclusions:

• SCaRe offers a paradigm shift in imaging deep brain capillary networks.
• This method broadens research into microvascular dysfunction in neurological conditions.
• Enables functional assessment of capillary networks for diagnostic potential.