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PressureMRI Resource Directory:<br> - UltraSound Physics -
 
Pressure is the force per unit area applied on a surface in a direction perpendicular to that surface.
Pressure can also be described as a form of potential energy in a fluid. The maximum pressure of the fluid medium obtained during propagation of an ultrasonic pulse.
The negative peak pressure is the peak rarefaction pressure attained during the negative portion of a propagating ultrasound pulse in a medium such as tissue.
Sound pressure can be measured using a microphone in air and a hydrophone in water. The SI unit for sound pressure is the Pascal.
Blood pressure is the pressure exerted by the blood on the walls of the blood vessels.
See also Rarefactional Pressure, Low Intensity Pulsed Ultrasound, and Projector.
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Bernoulli's principleOpen this link in a new window
   by en.wikipedia.org    
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Sound PressureMRI Resource Directory:<br> - UltraSound Physics -
 
Sound pressure is reported on a logarithmic scale called sound-pressure level, expressed in decibel (dB) referenced to the weakest audible 1 000 Hz sound pressure of 2´10-5 Pascal (20 mP). Sound level meters contain filters that simulate the ear?s frequency response. The most commonly used filter provides what is called 'A' weighting, with the letter 'A' appended to the dB units, i.e. dBA.
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Ultrasound in diagnostic and therapyOpen this link in a new window
   by www.anst.uu.se    
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Services and Supplies - Resources pool - Carotid - Education - Ultrasound Guided Interventions - UltraSound Training Courses
 
Rarefactional PressureMRI Resource Directory:<br> - UltraSound Physics -
 
The rarefactional pressure is the amplitude of a negative instantaneous sound pressure in an ultrasound beam. Rarefaction is the reduction in pressure of the medium during the acoustic cycle.
See also Mechanical Index.
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An Introduction to UltrasoundOpen this link in a new window
   by www.cis.rit.edu    
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AlbunexInfoSheet: - Contrast Agents - 
Intro, 
Historical Development, 
Microbubbles,
etc.MRI Resource Directory:<br> - Contrast Agents -
 
Albunex and Infoson, used mainly in cardiac evaluations, are first generation one-pass-only contrast agents and have been replaced by the new-generation contrast media. Albunex and Infoson are the same sonicated human serum albumin microbubbles. Infoson is licensed and manufactured in Europe, while Albunex was produced in the USA.
Albunex, an air-filled microbubble with a denatured albumin shell (modified from air-filled albumin microspheres prepared from sonicated 5% human serum albumin), was the first FDA-approved contrast agent, but is no longer in production.
Cardiac shunts and valve regurgitations are often evaluated with Color Doppler Imaging (CDI), which also improved with injections of Albunex, but this agent is pressure-sensitive and does not recirculate. It is effectively a one-pass-only agent, limiting its clinical efficacy.
See also First generation USCA, Echocardiography and Contrast Enhanced Ultrasound.
Drug Information and Specification:
DEVELOPER Mallinckrodt Inc.
INDICATION Contrast sonography and Doppler-echocardiography
APPLICATION Intravenous injection
TYPE Microbubble
SHELL - STABILIZATION Albumin
GAS Air
DO NOT RELY ON THE INFORMATION PROVIDED HERE, THEY ARE NOT A SUBSTITUTE FOR THE ACCOMPANYING PACKAGE INSERT!

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molecular imaging using ultrasoundOpen this link in a new window
   by bjr.birjournals.org    
Detecting and Imaging Microbubble contrast agents with ultrasoundOpen this link in a new window
2000   by www.collectionscanada.ca    
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Beam PatternMRI Resource Directory:<br> - UltraSound Physics -
 
The beam pattern shows the relative amplitude of the acoustic pressure as a function of direction relative to the transducer. Beam patterns are three-dimensional. The transmit and receive beam patterns are basically the same.
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