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Result : Searchterm 'Velocity' found in 7 terms [] and 41 definitions [])
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VelocityMRI Resource Directory:<br> - UltraSound Physics -
 
Sound waves must have a medium to pass through. The velocity or propagation speed is the speed at which sound waves travel through a particular medium measured in meters per second (m/s) or millimeters per microsecond (mm/µs). Because the velocity of ultrasound waves is constant, the time taken for the wave to return to the probe can be used to determine the depth of the object causing the reflection.
The velocity is equal to the frequency x wavelength.
V = f x l
The velocity of ultrasound will differ with different media. In general, the propagation speed of sound through gases is low, liquids higher and solids highest.

Velocity (m/s)
point air: 331;
point fat: 1450;
point water (50°C): 1540;
point human soft tissue: 1540;
point brain: 1541;
point liver: 1549;
point kidney: 1561;
point blood: 1570;
point muscle: 1585;
point lens of eye: 1620;
point bone: 4080.
Doppler ultrasound visualizes blood flow-velocity information. The peak systolic velocity and the end diastolic velocity are major Doppler parameters, which are determined from the spectrum obtained at the point of maximal vessel narrowing. Peak systolic velocity ratios are calculated by dividing the peak-systolic velocity measured at the site of flow disturbance by that measured proximal of the narrowing (stenosis, graft, etc.).
See Acceleration Index, Acceleration Time, Modal Velocity, Run-time Artifact and Maximum Velocity.
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• Related Searches:
    • Packet Size
    • Flow
    • Acceleration Index
    • Temporal Mean Velocity
    • Vascular Ultrasound

 Further Reading:
  Basics:
Ultrasound Physics Main differences between Ultrasound and X-rays, Velocity of sound in some Biological MaterialsOpen this link in a new window
   by www.drgdiaz.com    
Doppler ultrasoundOpen this link in a new window
   by www.ob-ultrasound.net    
  News & More:
ULTRASOUND MEASUREMENT OF THE EFFECT OF TEMPERATURE ON MICROPERFUSION IN THE EYEOpen this link in a new window
Thursday, 25 April 2002   by www.ncbi.nlm.nih.gov    
Searchterm 'Velocity' was also found in the following services: 
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Mean VelocityMRI Resource Directory:<br> - Vascular -
 
The mean velocity is a mathematical mean of the spectral shifts in velocity within a given sample volume.
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US Resources  
4d UltraSound - UltraSound Reimbursement - Devices Machines Scanners Systems - Intravascular - Ultrasound Therapy - Used and Refurbished UltraSound Equipment
 
Modal VelocityMRI Resource Directory:<br> - Doppler UltraSound -
 
The modal velocity is the frequency component which contains the most energy. In the display of the Doppler spectrum, the mode corresponds to the brightest parts of the individual spectra.
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Maximum VelocityMRI Resource Directory:<br> - Vascular -
 
(Vmax) The maximum velocity is the highest velocity found with significant amplitude within the sampled region normally for use in Bernoulli type gradient estimations.
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Blood Flow VelocityMRI Resource Directory:<br> - UltraSound Physics -
 
The velocity of flowing blood is usually measured in cm/s. It is always zero at the vessel wall and the velocity profile across a vessel can have various shapes depending upon the type of flow being observed (see also pulsatile flow). Laminar flow giving rise to a laminar velocity profile, plug flow giving rise to a flat velocity profile and disturbed flow can be distinguished.
Normal peak systolic velocities in the femoral and popliteal arteries vary from 90 to 110 cm/s in the femoral artery and from 40 to 70 cm/s in the popliteal artery.
See also Bi-directional Flow, Pulsatility Index, and Acceleration Index.
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 Further Reading:
  Basics:
Noninvasive Evaluation of Peripheral Arterial DiseaseOpen this link in a new window
   by ej.rsna.org    
Ultrasound Imaging of Carotid Artery DiseaseOpen this link in a new window
   by rad.usuhs.mil    
Bernoulli's principleOpen this link in a new window
   by en.wikipedia.org    
  News & More:
Doppler ultrasoundOpen this link in a new window
   by www.ob-ultrasound.net    
US Resources  
Pelvic - Manufacturers - DICOM - Obstetric - UltraSound Physics - Portals
 
Related Searches:
 • Vascular Ultrasound
 • Temporal Mean Velocity
 • Doppler Ultrasound
 • Packet Size
 • Blood Flow Velocity
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