External Size Calibration
External Size Calibration - Related Videos
10:09
Adjustable Stiffness, External Fixator for the Rat Femur Osteotomy and Segmental Bone Defect Models
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Cited by 19 •
2014
One constraint of preclinical research in the field of bone repair is the lack of experimental control over the local mechanical environment within a healing bone lesion. We report the design and use of an external fixator for bone repair with the ability to change fixator stiffness in vivo.
07:43
Calibration Curves
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2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia Calibration curves are used to understand the instrumental response to an analyte and predict the concentration in an unknown sample. Generally, a set of standard samples are made at various concentrations with a range than includes the unknown of interest and the instrumental response at each concentration is recorded. For more accuracy and to understand the error, the response at each concentration can be repeated so an error...
01:11
Glassware Calibration
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2024
Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes. Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
01:20
Externalities
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2025
Externalities are unintended side effects of economic activities that impact third parties who are not directly involved in the market transaction. They can have positive or negative effects that can influence society and the environment in various ways. Positive Externalities Positive externalities occur when a market activity produces benefits for others without those beneficiaries having to pay for it. Examples include: Education: When individuals receive an education, society benefits...
01:25
The Anchoring-and-Adjustment Heuristic
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2020
In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the $2,000...
FAQs
The key output is a scale factor, typically expressed as physical units per pixel. It is calculated from the known dimension of the reference standard and its measured image dimension, then applied to sample measurements. This conversion turns image-based distances into physical dimensions and can reveal errors caused by incorrect or variable magnification.
Matching optical, detector, or scanning conditions is essential because the calibration relationship belongs to the imaging setup used for measurement. If those conditions change, the apparent image dimensions may no longer correspond to the established factor. Recalibrating under the experimental conditions helps keep size estimates consistent and supports valid comparisons between measurements.
External Size Calibration separates measurement of the reference from the biological or engineered sample while tying both to a shared imaging scale. That separation allows calibrated measurements of cells, particles, pores, microfabricated features, or tissue constructs to be expressed in common physical units. Researchers can therefore compare dimensions across experiments, instruments, and laboratories more consistently.
First, image a reference standard with known dimensions using the same optical, detector, or scanning conditions planned for the sample. Measure the standard in the resulting image, calculate the physical-units-per-pixel relationship, and use that scale to convert sample dimensions. Keeping calibration tied to the experiment helps identify magnification-related error before interpreting results.
It can support quantitative measurements of cell size, particle dimensions, pore dimensions, microfabricated features, and tissue-construct geometry. These uses extend beyond recording image lengths: calibrated values can be compared across experiments or instruments and can contribute to quality-control assessments when biological samples or engineered structures require consistent dimensional measurements.
It can expose magnification-related error by comparing the known physical dimension of the reference standard with its measured image dimension. An incorrect relationship between pixels and physical units can otherwise make a structure appear larger or smaller than it is. Detecting that discrepancy before sample analysis improves confidence in reported dimensions and subsequent cross-study comparisons.