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Related Concept Videos

Normal Stress01:19

Normal Stress

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Normal stress is a type of stress that occurs when forces act perpendicular, or normal, to a material's cross-sectional area. This stress often arises in structures when subjected to axial loading, which is the application of force along the axis of an object. A practical example of this can be found in bridge truss members.
When a rod is under axial loading, the internal forces and corresponding stress are normal to the plane of the section, so it is termed normal stress. It's important to...
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Normal Distribution01:11

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The normal, a continuous distribution, is the most important of all the distributions. Its graph is a bell-shaped symmetrical curve, which is observed in almost all disciplines. Some of these include psychology, business, economics, the sciences, nursing, and, of course, mathematics. Some instructors may use the normal distribution to help determine students’ grades. Most IQ scores are normally distributed. Often real-estate prices fit a normal distribution. The normal distribution is...
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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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When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
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Dimensional Analysis03:40

Dimensional Analysis

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Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this approach is: the units of quantities must be subjected to the same mathematical operations as their associated numbers. This method can be applied to computations ranging from simple unit conversions to more complex and multi-step calculations involving several different quantities and their units.
Conversion Factors and Dimensional Analysis
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Applications of Normal Distribution01:22

Applications of Normal Distribution

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The normal distribution is a useful statistical tool. One of its practical applications is determining the door height after considering the normal distribution of heights of persons, such that many can pass through it easily without striking their heads. The normal distribution can also determine the probability of a person having a height less than a specific height.
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Related Experiment Video

Updated: Jan 27, 2026

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
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Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

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Normalized field autocorrelation function-based optical coherence tomography three-dimensional angiography.

Jianbo Tang1,2,3, Sefik Evren Erdener1,2,3, Smrithi Sunil1

  • 1Boston University, Neurophotonics Center, Department of Biomedical Engineering, Boston, Massachusett, United States.

Journal of Biomedical Optics
|March 15, 2019
PubMed
Summary
This summary is machine-generated.

A new method called normalized field autocorrelation function-based OCTA (g1-OCTA) improves 3-D vascular imaging by reducing artifacts and distinguishing blood flow direction. This advanced OCTA technique offers clearer visualization of microvasculature.

Keywords:
normalized autocorrelation functionoptical coherence tomography angiographythree-dimensional vascular imagingvessel tail artifacts

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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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Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Optical coherence tomography angiography (OCTA) enables en face visualization of microvasculature.
  • Standard OCTA faces challenges in 3-D imaging, including "tail" artifacts below large vessels.
  • OCTA struggles to differentiate descending arterioles from ascending venules.

Purpose of the Study:

  • To introduce a novel OCTA technique, g1-OCTA, for improved 3-D vascular imaging.
  • To minimize "tail" artifacts and enable differentiation of arterioles and venules.
  • To enhance the accuracy and quantitative potential of vascular network characterization.

Main Methods:

  • Calculated normalized field autocorrelation function g1(τ) from repeated OCT acquisitions.
  • Retrieved decay amplitude of g1(τ) to represent voxel dynamics.
  • Utilized Intralipid injection to enhance OCT signal in capillaries for improved flow detection.

Main Results:

  • The g1-OCTA technique significantly minimized "tail" artifacts in 3-D OCTA.
  • Penetrating arteries were readily identified, and blood flow direction was distinguished.
  • g1-OCTA demonstrated a largely increased depth-of-field compared to regular OCTA.

Conclusions:

  • g1-OCTA provides a more accurate 3-D rendering of vascular anatomy.
  • The technique effectively distinguishes arterioles from venules.
  • g1-OCTA holds potential for more quantitative characterization of vascular networks.