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Related Concept Videos

Doppler Effect - II01:05

Doppler Effect - II

The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Doppler Effect - I00:56

Doppler Effect - I

The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
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Upsampling01:22

Upsampling

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Related Experiment Video

Updated: Jun 22, 2026

Assessing Intracardiac Vortices with High Frame-Rate Echocardiography-Derived Blood Speckle Imaging in Newborns
07:13

Assessing Intracardiac Vortices with High Frame-Rate Echocardiography-Derived Blood Speckle Imaging in Newborns

Published on: December 22, 2023

Speckle reduction in optical coherence tomography using angular compounding by B-scan Doppler-shift encoding.

Hui Wang, Andrew M Rollins

    Journal of Biomedical Optics
    |July 2, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We introduce AngularCBD, a new method for reducing speckle in optical coherence tomography (OCT). This technique enhances image clarity without slowing down image acquisition, improving visualization of biological tissues.

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    Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)
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    Published on: August 4, 2018

    Area of Science:

    • Biomedical optics
    • Medical imaging technology
    • Ophthalmology and vision science

    Background:

    • Speckle noise is a significant artifact in optical coherence tomography (OCT) images, degrading image quality and hindering diagnostic accuracy.
    • Traditional speckle reduction methods often compromise image resolution or acquisition speed, limiting their clinical applicability.

    Discussion:

    • AngularCBD utilizes B-scan Doppler-shift encoding to achieve angular compounding, effectively suppressing speckle noise.
    • By decentering the probe beam, different illumination angles are encoded in Doppler shifts, allowing for reconstruction of multiple images from distinct Doppler bands.
    • This approach enables speckle reduction without sacrificing the rapid image acquisition rates crucial for in vivo imaging.

    Key Insights:

    • AngularCBD offers a novel and effective strategy for speckle reduction in OCT.
    • The method successfully suppresses speckle noise while maintaining high image acquisition speeds.
    • Demonstrated efficacy in phantom, in vitro, and in vivo tissue imaging.

    Outlook:

    • AngularCBD holds promise for enhancing the diagnostic capabilities of OCT in various clinical applications.
    • Further research could explore optimization of AngularCBD parameters for specific tissue types and imaging depths.
    • This technique may pave the way for improved visualization of microstructures in biological samples.