Arteriolar Diameter Measurement
Arteriolar Diameter Measurement - Related Videos
02:38
Analysis of Calcium Dynamics and Membrane Potential Changes in a Mouse Arteriolar Endothelium
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2025
Source: Hakim, M. A. et al., Isolation and Functional Analysis of Arteriolar Endothelium of Mouse Brain Parenchyma. J. Vis. Exp. (2022).This video demonstrates the functional analysis of an arteriolar endothelial tube isolated from a mouse brain. It outlines the steps for measuring intracellular calcium levels and membrane potential, both at baseline and in response to pharmacological stimulation.
08:24
Size Matters: Measurement of Capsule Diameter in Cryptococcus neoformans
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Cited by 17 •
2018
The polysaccharide capsule is the primary virulence factor in Cryptococcus neoformans, and its size correlates with strain virulence. Capsule diameter measurements are used in phenotypic testing and to gauge therapeutic efficacy. Here a standard method of capsule induction is presented, and two methods of staining and measuring diameter are compared.
04:04
Measuring Retinal Vessel Diameter from Mouse Fluorescent Angiography Images
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Cited by 2 •
2023
Mouse retinal vasculature is particularly interesting in understanding the mechanisms of vascular pattern formation. This protocol automatically measures the diameter of mouse retinal vessels from fluorescent angiography fundus images at a fixed distance from the optic disk.
11:37
Propeller Characterization: Variations in Pitch, Diameter, and Blade Number on Performance
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2023
Source: Shreyas Narsipur, Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC A propeller is a twisted airfoil, where the angle of the chord changes with respect to the location, along the radial station, as shown in Figure 1. Propellers are widely used in aircraft and watercraft propulsion systems thereby necessitating detailed characterizations of propellers to design high performance vehicles. Figure 1. Chord, thickness, and pitch at a radial station. One of...
16:43
Murine Spinotrapezius Model to Assess the Impact of Arteriolar Ligation on Microvascular Function and Remodeling
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Cited by 7 •
2013
We demonstrate a novel arterial ligation model in murine spinotrapezius muscle, including a step-by-step procedure and description of required instrumentation. We describe the surgery and relevant outcome measurements relating to vascular network remodeling and functional vasodilation using intravital and confocal microscopy.
FAQs
Changes in lumen width provide a readout of vascular tone because constriction and dilation reflect activity of vascular smooth muscle. Measuring these changes in brain arterioles therefore helps researchers evaluate local blood-flow regulation at the vessel level rather than relying only on a general vascular response.
A time-resolved record shows whether the lumen narrows or widens and links that change to vascular smooth muscle activity. This distinguishes transient constriction from dilation and reveals how the vessel responds during changing neural or hemodynamic conditions. In neuroscience experiments, the resulting trajectory can be compared with sensory stimulation, neuronal activation, or blood-pressure changes.
By quantifying arteriolar narrowing and widening during neuronal activation or sensory stimulation, the measurement supplies a vascular counterpart to neural events. Researchers can use this relationship to examine how local vessel responses contribute to hemodynamic signals. That connection is especially relevant when interpreting functional imaging signals as consequences of activity-linked vascular regulation.
Researchers use calibrated high-resolution images or video, identify the two vessel boundaries, and determine the lumen width between them. Repeating the measurement over time produces a record of diameter changes rather than a single value. Calibration allows image dimensions to be converted into a quantitative vessel-width measurement suitable for comparing vascular responses.
This approach can be applied during sensory stimulation, neuronal activation, or changes in blood pressure to examine corresponding vascular responses. It also supports testing of pharmacological responses, where diameter changes provide an outcome for evaluating effects on vascular behavior. Across these conditions, measurements help characterize how local arterioles respond to neural, hemodynamic, or drug-related challenges.
Because vessel width directly reports changes in vascular tone, it can reveal altered constriction or dilation associated with cerebrovascular disease. The same measurements can be related to mechanisms connecting neural activity with hemodynamic signals used in functional imaging. This makes the technique useful for studying disease-related vascular behavior and interpreting activity-linked blood-flow changes.