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Related Concept Videos

Doppler Effect - II01:05

Doppler Effect - II

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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...
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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...
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To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
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This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
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Doppler Optical Coherence Tomography of Retinal Circulation
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Published on: September 18, 2012

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Advances in Doppler OCT.

Gangjun Liu1, Zhongping Chen1

  • 1Beckman Laser Institute, University of California, Irvine, USA ; Department of Biomedical Engineering, University of California, Irvine, USA.

Chinese Optics Letters : COL
|January 21, 2014
PubMed
Summary
This summary is machine-generated.

Doppler optical coherence tomography (OCT) advances enable precise flow quantification and microvasculature imaging. New functional OCT algorithms extend these capabilities for diverse biomedical applications.

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Optical Physics

Background:

  • Optical Coherence Tomography (OCT) provides cross-sectional imaging of biological tissues.
  • Doppler OCT extends OCT to measure and visualize motion, primarily blood flow.
  • Advancements are crucial for non-invasive physiological monitoring and diagnostics.

Purpose of the Study:

  • To review the fundamental principles of Doppler OCT.
  • To highlight recent advancements in Doppler OCT methodologies.
  • To discuss emerging applications of Doppler OCT in various biomedical fields.

Main Methods:

  • Review of phase-resolved Doppler OCT techniques.
  • Introduction of functional OCT algorithms extending phase-resolved methods.
  • Discussion of experimental setups and data analysis for applications.

Main Results:

  • Demonstration of enhanced phase-resolved Doppler OCT for improved sensitivity and accuracy.
  • Presentation of functional OCT algorithms for advanced motion analysis.
  • Successful application of Doppler OCT in quantifying flow, imaging microvasculature, analyzing vocal fold vibration, and optical coherence elastography.

Conclusions:

  • Doppler OCT is a versatile imaging modality with significant potential.
  • Recent methodological advancements have expanded its diagnostic and research capabilities.
  • Further development promises broader clinical and scientific impact in visualizing dynamic biological processes.