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 'Acoustic Power' 
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Acoustic PowerMRI Resource Directory:<br> - UltraSound Physics -
 
The acoustic power of sound and ultrasound is the energy delivered per unit of time. The power is measured in Watt (W) and is proportional to the square of the amplitude.
1 W = 1 joule/second.
See also Directivity Index, Spatial Average Intensity, and Source Level.
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Ultrasound in diagnostic and therapyOpen this link in a new window
   by www.anst.uu.se    
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Ultrasound Therapy - Fetal - UltraSound Technician and Technologist Schools - Vascular - Patient Information - Resources pool
 
Backscatter EnergyMRI Resource Directory:<br> - UltraSound Physics -
 
The backscatter energy is the portion of the incident acoustic power scattered back toward the transducer.
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BackscatteringMRI Resource Directory:<br> - UltraSound Physics -
 
Ultrasound waves are reflected when there is a change in acoustic impedance. The larger the change, the more ultrasound is reflected. Microbubbles have an enormous difference in acoustic impedance as compared to surrounding fluid due to the large differences in density, elasticity and compressibility.
At low acoustic power (mechanical index less than 0.1), the mechanism of ultrasound reflection is that of Rayleigh scattering and the microbubbles may be regarded as point scatterers. The scattering strength of a point scatterer is proportional to the sixth power of the particle radius and to the fourth power of the ultrasound frequency;; the echogenicity of such contrast agent is therefore highly dependent upon particle size and transmit frequency. The backscattered intensity of a group of point scatterers is furthermore directly proportional to the total number of scatterers in the insonified volume. The concentration of the contrast medium is of importance.
See also Backscatter Energy, Cross-section Scattering.
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A brief introduction to ultrasoundOpen this link in a new window
   by dukemil.egr.duke.edu    
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Science to Practice Which US Microbubble Contrast Agent Is Best for Gene Therapy?Open this link in a new window
   by radiology.rsna.org    
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Bubble RuptureMRI Resource Directory:<br> - Contrast Agents -
 
Ultrasound at the microbubble resonance frequency can cause bubble rupture at high acoustic power (mechanical index (MI) greater than 0.5). The result is a transient high-amplitude, broadband signal containing all frequencies, not only the harmonics. It will create a strong signal in B-mode or a short-lasting multicolored, mosaic-like effect in color Doppler sonography.
Several terms for this typical signal have been used, e.g. induced or stimulated acoustic emission, loss of correlation imaging and sono-scintigraphy.
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Coded ExcitationMRI Resource Directory:<br> - UltraSound Physics -
 
Increasing the frequency of the transmitted power improves the image quality of ultrasound, but the improvement in resolution results in a decreased signal to noise ratio (SNR). Higher acoustic power levels can prevent the loss in SNR, but among other reasons, ultrasound regulations limit this to avoid heating or cavitation.
Coded excitation increase the signal to noise ratio without the loss of resolution by using coded waveforms. Coded excitation allows transmitting a long wide-band pulse with more acoustic power and high penetration of the sound beam.
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Coded Pulse Excitation for Ultrasonic Strain Imaging(.pdf)Open this link in a new window
Wednesday, 2 February 2005   by ultrasonics.bioen.uiuc.edu    
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