Laser speckle contrast imaging of hepatic microcirculation
Oleg Zhukov1, Dmitry D Postnov2, Kamilla H Hejn3,4
1Department of Biomedical Sciences, University of Copenhagen , Copenhagen, Denmark.
Biomedical Optics Express
|May 5, 2025
Summary
Researchers visualized liver microcirculation in rats using laser speckle contrast imaging. This technique revealed rhythmic blood flow oscillations and flow reduction after Angiotensin II, offering insights into liver hemodynamics and disease.
Area of Science:
- Physiology
- Microcirculation
- Hepatology
Background:
- The liver's role in blood homeostasis relies on adequate blood supply.
- Global regulation of liver blood flow is understood, but microvascular mechanisms are unclear.
Purpose of the Study:
- To investigate hepatic sinusoidal hemodynamics in vivo.
- To visualize and quantify microvascular blood flow in the liver.
Main Methods:
- Utilized laser speckle contrast imaging (LSCI) for high-resolution visualization of liver microcirculation in anesthetized rats.
- LSCI provided spatial resolution of micrometers and temporal resolution for tracking flow dynamics in individual sinusoids and venules.
Main Results:
- Successfully visualized individual liver sinusoids and venules in vivo.
- Detected a reduction in microvascular blood flow following local Angiotensin II administration.
- Observed oscillations in microvascular blood flow at frequencies of 0.05-0.4 Hz, potentially due to upstream vessel contractions.
Conclusions:
- LSCI is effective for studying liver microcirculation dynamics.
- Findings provide novel insights into vessel-specific hemodynamics within the liver.
- This research opens avenues for investigating vascular dysfunction in metabolic liver diseases.
