Pulse Wave Doppler
Pulse Wave Doppler - Related Videos
14:19
Fetal Echocardiography and Pulsed-wave Doppler Ultrasound in a Rabbit Model of Intrauterine Growth Restriction
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Cited by 11 •
2013
We describe examination of fetal cardiac function with contemporary functional fetal echocardiography and fetoplacental Doppler ultrasound using the VisualSonics VEVO 2100 microultrasound in a surgically induced model of intrauterine fetal growth restriction in a rabbit.
09:12
Sound Waves and Doppler Shift
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2023
Source: Arianna Brown, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Waves are disturbances that propagate through a material medium or empty space. Light waves can travel through a vacuum and some forms of matter, and are transverse in nature, which means that the oscillations are perpendicular to the direction of propagation. However, sound waves are pressure waves that travel through an elastic medium like air,...
12:25
Peripheral Vascular Exam Using a Continuous Wave Doppler
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2015
Source: Joseph Donroe, MD, Internal Medicine and Pediatrics, Yale School of Medicine, New Haven, CT Peripheral vascular disease (PVD) is a common condition affecting older adults and includes disease of the peripheral arteries and veins. While the history and physical exam offer clues to its diagnosis, Doppler ultrasound has become a routine part of the bedside vascular examination. The video titled "The Peripheral Vascular Exam" gave a detailed review of the physical examination of the...
08:07
Ultrasound-based Pulse Wave Velocity Evaluation in Mice
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Cited by 25 •
2017
Arterial stiffness represents a key factor in cardiovascular disease and pulse wave velocity (PWV) can be considered as a surrogate index for arterial stiffness. This protocol describes an image processing algorithm for calculating PWV in mice based on ultrasound image processing that is applicable at different arterial sites.
09:32
Standing Waves
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2023
Source: Arianna Brown, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Standing waves, or stationary waves, are waves that appear not to propagate and are produced by the interference of two waves traveling in opposite directions with the same frequency and amplitude. These waves appear to vibrate up and down with no linear movement and are most easily identified in vibrating finite media like a plucked guitar string,...
FAQs
Selecting a sample volume allows Pulse Wave Doppler to confine analysis to echoes from a defined depth. This depth resolution helps examine blood moving in a particular location rather than combining signals from unspecified regions. In cardiovascular imaging, that localization helps characterize flow within the area being assessed.
Pulse-repetition frequency determines how often the transducer sends pulses and influences the range of velocities that can be measured. If the setting is not appropriate for the blood-flow velocity, aliasing can occur, causing the displayed velocity pattern to misrepresent the actual signal. PRF is therefore central to accurate interpretation.
Returning echoes contain Doppler frequency shifts produced by moving blood. The system analyzes these shifts and converts them into velocity values displayed over time; the shift also supports assessment of flow direction. This provides a time-dependent description of blood movement that can be used during cardiovascular evaluation.
The technique provides velocity values over time from a selected blood-flow region. In echocardiography, these measurements can be used to estimate pressure gradients, adding hemodynamic information beyond visual assessment of moving blood. This supports evaluation of cardiovascular function and helps clinicians interpret possible flow-related abnormalities.
In vascular imaging, Pulse Wave Doppler can characterize flow patterns at a selected depth and identify abnormal flow associated with stenosis. Because the measurement tracks velocity over time, clinicians can examine how circulation behaves within the region of interest and use that information to support diagnosis of impaired blood flow.
During echocardiographic assessment, measured blood-flow velocity and direction provide information about how blood moves through the heart. These data can help identify impaired valve function and contribute to pressure-gradient estimates. The result is a noninvasive way to add quantitative flow information to cardiovascular evaluation, complementing the broader assessment of circulation.