Fiber-optic laser-Doppler anemometer microscope applied to the cerebral microcirculation in rats
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Published on: May 30, 2018
1Department of Biomedical Engineering, National Cardiovascular Center Research Institute, Osaka, Japan.
Abstract:
We have applied our developed fiber-optic laser-Doppler anemometer microscope (FLDAM) for the study of the cerebral microcirculation in the rat. The red cell velocity in single pial microvessels was successfully measured through a closed cranial window for the vessel diameter range from 7.8 to 230 microns. The temporal resolution of the FLDAM was sufficiently high to detect the pulsation in the arterioles. Arterio-venous distributions of the temporal mean red cell velocity and wall shear rate are also described.
Insights
A novel fiber-optic laser-Doppler anemometer microscope (FLDAM) successfully measured red blood cell velocity in rat cerebral microvessels. This technique allows detailed study of microcirculation dynamics, including pulsatile flow in arterioles.
Area of Science:
- Physiology
- Biomedical Engineering
- Microcirculation Research
Background:
- Cerebral microcirculation is vital for brain function.
- Accurate measurement of red blood cell (RBC) velocity is crucial for understanding microvascular dynamics.
- Existing methods may have limitations in temporal resolution or invasiveness.
Purpose of the Study:
- To introduce and validate a novel fiber-optic laser-Doppler anemometer microscope (FLDAM).
- To assess the capability of FLDAM for measuring RBC velocity in rat pial microvessels.
- To characterize arterio-venous distributions of RBC velocity and wall shear rate in the cerebral microvasculature.
Main Methods:
- Development and application of a fiber-optic laser-Doppler anemometer microscope (FLDAM).
- In vivo measurements in rat cerebral pial microvessels through a closed cranial window.
- Measurement of RBC velocity across a range of vessel diameters (7.8–230 microns).
Main Results:
- Successful measurement of RBC velocity in single pial microvessels.
- FLDAM demonstrated high temporal resolution, capturing arteriolar pulsations.
- Detailed description of arterio-venous gradients in temporal mean RBC velocity and wall shear rate.
Conclusions:
- The FLDAM is a viable tool for studying cerebral microcirculation in rats.
- The system provides high-resolution data on RBC dynamics in microvessels.
- The study offers insights into the distribution of flow parameters within the cerebral microvasculature.
