Luminal Diameter Measurement
Luminal Diameter Measurement - Related Videos
08:24
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Cited by 17 •
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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
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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.
09:17
In Vivo Luminal Measurement of Distension-Evoked Urothelial ATP Release in Rodents
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Cited by 1 •
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This protocol describes the procedure for measuring ATP concentrations in the lumen of the bladder in an anesthetized rodent.
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...
10:21
Studying Murine Small Bowel Mechanosensing of Luminal Particulates
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Cited by 3 •
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To study how the small bowel handles particulates of varying sizes, we have modified an established in vivo method to determine small bowel transit.
FAQs
Calibration converts image pixels into physical distance, allowing measurements from different images or magnifications to be compared. The image scale should be established before measuring between opposing luminal boundaries. Without calibration, an apparently larger or smaller lumen may reflect imaging scale rather than biology, weakening conclusions about structural change across samples or experimental time points.
Measuring along an axis perpendicular to the walls establishes a consistent cross-sectional width rather than an arbitrarily oriented distance. This matters when comparing lumens across biological samples because the selected direction becomes part of the measurement rule. Applying the same geometric criterion helps distinguish genuine changes in vessel, duct, or organ morphology from differences caused by image evaluation.
Reliable comparisons depend on more than the measurement itself. Consistent sectioning keeps corresponding structures comparable, adequate image resolution makes the opposing boundaries distinguishable, and a stable rule for selecting those boundaries reduces analyst-dependent variation. If any of these conditions changes between groups or time points, measured diameter differences may reflect methodology instead of altered biological geometry.
A practical workflow begins by selecting a microscopy or medical image that shows the structure clearly, then identifying the two opposing luminal boundaries. After calibrating pixel dimensions to a physical scale, the measurement is taken across the defined cross-section, commonly using the perpendicular axis. Applying this sequence consistently produces values suitable for comparisons among samples.
The measurement can reveal geometric changes associated with vascular remodeling, airway morphology, or intestinal structure. It is also useful when development, disease, or an experimental treatment may alter the size of an internal passage. Because the result is quantitative, investigators can compare structural effects across conditions rather than relying only on descriptive observations.
Comparisons are most informative when images are evaluated with the same sectioning approach, scale calibration, boundary criteria, and cross-sectional orientation. Researchers can then examine whether vessel, duct, or organ geometry differs among samples or changes across time points. Interpreting the values in this standardized context helps connect a measured diameter difference with remodeling or treatment-related morphology.