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WavelengthMRI Resource Directory:<br> - UltraSound Physics -
 
The wavelength is a unit of relative distance equal to the length of a wave. This could be a light wave, a radio wave, or even a sound wave. For sound waves the formula is:
l=c/f (wavelength = propagation speed/frequency)
In ultrasound imaging is the wavelength the distance between the onset of peak compression or cycle to the next. The wave propagates as bands of compression and rarefaction. One wavelength is the distance between two bands of compression, or rarefaction. Maximum compression corresponds to maximum pressure. The wavelength (see also Angstrom) is important in image resolution.
See also Spectral Reflector.
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 Further Reading:
  Basics:
An Introduction to UltrasoundOpen this link in a new window
   by www.cis.rit.edu    
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AngstromMRI Resource Directory:<br> - UltraSound Physics -
 
(Å* or A*) A unit used to measure the wavelength of X-rays.
Definition: 0.1 nanometer or 10-10 meter.
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Endoscopic - Software - DICOM - Education - Education pool - Hospitals
 
Cross-section ScatteringMRI Resource Directory:<br> - UltraSound Physics -
 
Cross-section scattering is a measure of the scattering strength of a point scatterer. The scattering strength is dependent on the size of the scatterer, the density and compressibility of the scatterer and the surrounding medium, and the ultrasound wavelength.
If a transducer emits ultrasound with a total acoustic power of P, and the power is assumed to be uniform distributed over the US beam cross-sectional area, then the ultrasound intensity at a certain range, is defined by:
I = P/A
where I is the intensity, and A is the cross-sectional beam area at that range.
A point scatterer located in the ultrasound beam at this range, will scatter the ultrasound with a total acoustic power of Ps, defined by:
Ps = I s
where s is the scattering cross-section of the point scatterer.
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 Further Reading:
  Basics:
A brief introduction to ultrasoundOpen this link in a new window
   by dukemil.egr.duke.edu    
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DivergenceMRI Resource Directory:<br> - UltraSound Physics -
 
The divergence is an ultrasound beam characteristic of the far field. The beam divergence angle, q, depends on the transducer frequency and diameter according to the following approximation:
sin q º 1.22 ld
where l is the wavelength of the ultrasound in the medium of propagation and d is the diameter of the transducer element.
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  Basics:
Physics Tutorial: Ultrasound PhysicsOpen this link in a new window
   by www.physics247.com    
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FrequencyMRI Resource Directory:<br> - UltraSound Physics -
 
(F) The number of cycles of a periodic process per unit time. Frequency and wavelength are inversely related. The higher the frequency the smaller the wavelength. The frequency of ultrasound is expressed in units of hertz (Hz), where 1 Hz = 1 cycle per second.
The effect of different frequencies on tissue penetration:
The higher the frequency the less the penetration, the lower the frequency the greater the penetration. As frequency increases, resolution improves but the imaging depth or penetration decreases. The lower the axial resolution, the more detail can be seen.
Usual frequencies for pediatric ultrasound: 5.0mHz to 7.5mHz and 10mHz.
Usual frequencies for adult ultrasound: 2.0mHz to 3.0mHz.
See also Doppler Interrogation Frequency, Multi-frequency Probe, and Huygens Principle.
Radiology-tip.comFrequency
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 Further Reading:
  Basics:
An Introduction to UltrasoundOpen this link in a new window
   by www.cis.rit.edu    
  News & More:
Normal Ultrasound of the SpineOpen this link in a new window
   by rad.usuhs.mil    
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Abdominal - UltraSound Physics - UltraSound Technician and Technologist Schools - Research Labs - Rental - Thyroid
 
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