Ultrasound contrast medium is an exogenous substance that changes the echo ultrasonography or Doppler ultrasound applications.
 
 
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Marketing Challenges Continue for Ultrasound Contrast Media
Offers data about Definity, Optison, and Imagent and their approval for opacification of the left ventricle to delineate wall motion effectively and the challenges of marketing the products.
http://www.biotechsystems.com/breakingmarketnews/challenges_for_ultrasound_contrast_media.asp
New Contrast Media Boost Image Quality
Article expounds upon the discovery of efficacious ultrasound contrast agents, contrast techniques, and vascular ultrasounds.
http://www.diagnosticimaging.com/dimag/legacy/AdvancedUS/contrast.html
Provides information about the contract medium for ultrasound, backscattering, bubble resonance and harmonics. It also contains tables which classify gas microbubble contrast media.
http://www.medcyclopaedia.com/library/topics/volume_i/u/ULTRASOUND_CONTRAST_MEDIUM.aspx