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Related Concept Videos

Range00:59

Range

13.9K
The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
15.9; 16.1; 15.2; 14.8; 15.8; 15.9; 16.0; 15.5
Measurements of the amount of soda in a 16-ounce can vary since different subjects record these measurements or since the exact amount - 16 ounces of liquid, was not...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Variation: Normal Distribution, Range, and Standard Deviation02:32

Variation: Normal Distribution, Range, and Standard Deviation

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In the field of psychology, there are several ways to organize measurements of a trait, feature, or characteristic (i.e., variables). Qualitative data, such as ethnicity, can be tabulated into a frequency count to provide information about the proportion, as well as the variety of groups in a sample or population. On the other hand, researchers can perform a wider set of calculations on quantitative data. The mean, mode, and median, for instance, are central tendency measures to identify a...
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Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

778
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
778
Range Rule of Thumb to Interpret Standard Deviation01:13

Range Rule of Thumb to Interpret Standard Deviation

13.4K
The range rule of thumb in statistics helps us calculate a dataset's minimum and maximum values with known standard deviation. This rule is based on the concept that 95% of all values in a dataset lie within two standard deviations from the mean.
For instance, the range rule of thumb can be used to find the tallest and the shortest student in a class, given the mean student height and standard deviation. If the mean student height is 1.6 m and the standard deviation, s is 0.05 m, the height...
13.4K
Circular Shaft - Stresses in Linear Range01:13

Circular Shaft - Stresses in Linear Range

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Consider a scenario where a circular shaft is subject to torque that remains within the boundaries of Hooke's Law, avoiding any permanent deformation. So, the formula for shearing strain is revisited. This formula is multiplied by the modulus of rigidity, and then Hooke's Law for the shearing stress and strain is applied. As a result, the equation for shearing stress in a shaft can be derived.
706

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Updated: Jan 21, 2026

Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography
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Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography

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High dynamic range optical coherence tomography angiography (HDR-OCTA).

Xiang Wei1,2, Tristan T Hormel1, Shaohua Pi1

  • 1Casey Eye Institute, Oregon Health & Science University, Portland, OR, 97239, USA.

Biomedical Optics Express
|July 31, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a new scanning pattern for high dynamic range optical coherence tomography angiography (OCTA), improving image quality by adjusting scan times to better capture varying blood flow speeds.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Current optical coherence tomography angiography (OCTA) suffers from limited dynamic range due to fixed scanning intervals.
  • High-speed OCT technology offers potential for enhancing the flow signal dynamic range.

Purpose of the Study:

  • To develop a novel scanning pattern for high dynamic range OCTA (HDR-OCTA).
  • To improve scanning efficiency and dynamic range in OCTA imaging.

Main Methods:

  • Implemented a bidirectional, interleaved scanning pattern.
  • Utilized adjustable adjacent inter-scan time intervals to accommodate different flow speeds.
  • Generated 3 distinct B-scan time intervals across 3 repetitions.

Main Results:

  • Achieved an improved flow dynamic range in OCTA images.
  • Demonstrated superior scanning efficiency with the novel pattern.
  • The method is sensitive to a wider spectrum of flow speeds.

Conclusions:

  • The novel scanning pattern effectively enhances the dynamic range of OCTA.
  • This approach offers a promising method for improving OCTA image quality and diagnostic capabilities.