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Image-based vessel-by-vessel analysis for red blood cell and plasma dynamics with automatic segmentation
Hiroshi Kawaguchi1, Kazuto Masamoto, Hiroshi Ito
1Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan.
Microvascular Research
|May 17, 2012
Summary
Cortical blood flow dynamics can be dissociated. Novel imaging reveals distinct responses of surface arteries and parenchymal microcirculation to different stimuli, supporting independent coordination.
Area of Science:
- Neuroscience
- Physiology
- Biomedical Engineering
Background:
- Understanding the regulation of cerebral blood flow is crucial for diagnosing and treating neurological disorders.
- Previous studies suggest that cortical surface vessels and parenchymal microcirculation may respond differently to physiological stimuli.
- Dissociating these responses is key to understanding localized brain function and disease progression.
Purpose of the Study:
- To test the hypothesis that vascular tone of the cortical surface and parenchymal blood flow can be dissociated.
- To develop and validate a novel image-based analytical method for quantifying vessel diameters and flow dynamics.
- To compare the effects of global (vasodilation) and local (sensory stimulation) perturbations on cerebral blood flow.
Main Methods:
- Developed a novel image-based analytical method using confocal laser scanning fluorescent microscopy.
- Utilized fluorescently labeled red blood cells (RBC) and plasma agents to track flow dynamics.
- Measured vessel diameters, time to signal appearance, and signal width under different perturbation conditions (sodium nitroprusside and sensory stimulation) in rat cerebral cortex.
Main Results:
- Sodium nitroprusside induced significant vasodilation in surface arteries (1.8-fold increase in small arteries).
- Sensory stimulation-induced vasodilation depended on vessel size, significantly affecting small arteries and veins.
- Sodium nitroprusside extended venous appearance time, while forepaw stimulation shortened it, indicating parenchymal microcirculation involvement.
Conclusions:
- Cortical surface vascular tone and parenchymal blood flow are individually coordinated.
- The developed imaging method allows for the quantitative assessment of dissociated vascular responses.
- Findings provide insights into the differential regulation of cerebral vasculature during varying physiological demands.
