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Related Concept Videos

Doppler Effect - I00:56

Doppler Effect - I

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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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Doppler Effect - II01:05

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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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Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

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Direct Method
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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Assessing Blood pressure using a doppler ultrasound01:19

Assessing Blood pressure using a doppler ultrasound

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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.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Related Experiment Video

Updated: Feb 23, 2026

Blood Flow Imaging with Ultrafast Doppler
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Blood Flow Imaging with Ultrafast Doppler

Published on: October 14, 2020

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The Doppler paradox.

Ioannis Ntalas1, Júlia Karády1,2, Stam Kapetanakis1

  • 1Department of Cardiology, Guy's and St. Thomas' NHS Foundation Trust, London, United Kingdom.

Echocardiography (Mount Kisco, N.Y.)
|September 1, 2017
PubMed
Summary
This summary is machine-generated.

Prosthetic valve thrombosis (PVT) can be missed by fluoroscopy. Multimodality imaging, including 3D echocardiography and CT, is crucial for diagnosing PVT and guiding successful treatment with valve replacement.

Keywords:
Dopplercomputed tomographyechocardiographyprosthetic valve

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Area of Science:

  • Cardiology
  • Medical Imaging
  • Cardiac Surgery

Background:

  • Obstructive prosthetic valve thrombosis (PVT) is a severe complication of prosthetic heart valves, often linked to inadequate anticoagulation.
  • Fluoroscopy is a standard tool for assessing prosthetic valve function but has limitations in detecting subtle PVT.
  • Limitations of fluoroscopy include its inability to visualize adjacent tissues and detailed valve physiology, potentially leading to missed diagnoses.

Observation:

  • A 54-year-old woman presented with exertional dyspnea and a mechanical mitral valve.
  • Initial valve fluoroscopy showed normal leaflet motion, despite clinical suspicion of PVT.
  • Advanced imaging techniques, specifically 3D echocardiography and ECG-gated multiphase computed tomography, were employed.

Findings:

  • 3D echocardiography and ECG-gated multiphase computed tomography definitively confirmed obstructive prosthetic valve thrombosis (PVT).
  • The patient's symptoms of exertional dyspnea were attributed to the undiagnosed PVT.
  • Successful treatment was achieved through surgical replacement of the affected prosthetic valve.

Implications:

  • This case highlights the critical role of multimodality imaging in diagnosing challenging cases of PVT.
  • Utilizing advanced imaging techniques can improve the detection of PVT, especially when fluoroscopy is inconclusive.
  • Accurate diagnosis via multimodality imaging is essential for timely and effective management of PVT, improving patient outcomes.