Ultrasound Waves
Ultrasound Waves - 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,...
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.
14:20
High-frequency Ultrasound Imaging of the Abdominal Aorta
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2023
Source: Amelia R. Adelsperger, Evan H. Phillips, and Craig J. Goergen, Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana High-frequency ultrasound systems are used to acquire high resolution images. Here, the use of a state-of-the-art system will be demonstrated to image the morphology and hemodynamics of small pulsatile arteries and veins found in mice and rats. Ultrasound is a relatively inexpensive, portable, and versatile method for the noninvasive...
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
A piezoelectric transducer sends brief high-frequency pulses into the body and detects echoes returning from internal boundaries. The system relates echo timing and strength to changes encountered within soft tissue, allowing it to construct information about internal structures during real-time imaging. This pulse-and-detection cycle enables repeated observations rather than a single static measurement.
Echoes vary because tissues have different acoustic properties, which affect how much of the transmitted energy returns to the transducer. The timing of an echo indicates when a boundary was encountered, while its strength reflects the character of that interaction. Together, these differences help separate internal structures in a clinical image.
Doppler analysis adds information about motion, particularly blood-flow motion, to the structural information obtained from returning echoes. This makes ultrasound useful not only for viewing organs and tissue boundaries but also for assessing movement within blood vessels. The combination supports clinical evaluation of vascular structures and their changing flow conditions.
The transducer delivers brief pulses, receives the returning echoes, and evaluates their timing and strength as the examination proceeds. These measurements are converted into real-time imaging information, allowing clinicians to observe organs, pregnancies, or vessels while the study is underway. Doppler analysis can be incorporated when blood-flow motion is clinically relevant.
Clinical applications include imaging organs, monitoring pregnancies, examining blood vessels, and supporting guided procedures. Its portability and repeatability make repeated assessments practical, while the absence of ionizing radiation supports its use when clinicians need ongoing diagnostic or monitoring information. The same imaging principles can be adapted to different soft-tissue targets.
Focused ultrasound uses concentrated acoustic energy for therapeutic purposes rather than relying only on echoes to display anatomy. This approach supports selected treatments, while diagnostic ultrasound primarily provides information for evaluation, monitoring, or procedural guidance. The distinction is based on whether acoustic energy is being used mainly to obtain clinical information or to deliver treatment.