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 'Enhancement' 
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EnhancementMRI Resource Directory:<br> - UltraSound Physics -
 
Ultrasound enhancement is the increase in reflection amplitude from objects that lie behind a weakly attenuating structure. Contrast agent particles enhance the reflectivity of blood.
The enhancement artifact may occur in structures below a cyst.
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• Related Searches:
    • Contrast Enhanced Ultrasound
    • Contrast Enhanced Doppler Imaging
    • Ultrasound Contrast Agents
    • Microbubbles
    • Coded Excitation

 Further Reading:
  News & More:
Ultrasound compounding with automatic attenuation compensation using paired angle scans(.pdf)Open this link in a new window
June 2006   by mi.eng.cam.ac.uk    
Searchterm 'Enhancement' was also found in the following service: 
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Radiology  (11) Open this link in a new windowMRI  (82) Open this link in a new window
Enhancement ArtifactInfoSheet: - Artifacts - 
Intro, 
Artifacts, 
ReductionMRI Resource Directory:<br> - Artifacts -
 
Enhancement artifacts occur if decreasing of the echo amplitude is not equal with penetration depth caused by inhomogeneous tissue layers and fluids like cysts or air-filled regions. The enhancement artifact appears as a hyperintense (hyperechoic) signal. The attenuation of the ultrasound wave in fluids is much lower as the attenuation in other tissues, therefore tissues distal to fluid are enhanced. Artificial enhancement may also be found distal to a homogeneous solid tumor surrounded by adipose tissue, due to the comparatively high attenuation in fat.
See also Boundary Layer, and Half-Value Layer.
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 Further Reading:
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Types of ultrasound artifacts?Open this link in a new window
   by www.frca.co.uk    
US Resources  
Distributors - Safety - History of UltraSound - General - Jobs - Resources
 
Contrast Agent ParticlesMRI Resource Directory:<br> - Contrast Agents -
 
(CAP) Contrast agent particles are filled with gas and coated by a shell. The reflectivity of a particle increases with the diameter. The used particles are too large to cross the endothelium, so that there is no interstitial phase of enhancement. They are essentially markers for the blood pool and their distribution is similar to those of tagged red cells. In addition, any body cavity that can be accessed can be injected with vascular contrast.
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Modeling and Characterization of Ultrasound Contrast AgentsOpen this link in a new window
   by home.online.no    
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Contrast Enhanced Doppler ImagingInfoSheet: - Modes - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:<br> - Doppler UltraSound -
 
Contrast agents improve the sensitivity of vascular Doppler ultrasound, for example in cerebrovascular sonography or examinations of deep abdominal vessels. They also enlarge the role of transcranial Doppler. Microbubbles can be used with various modes e.g., color and power Doppler imaging, as well as pulsed-wave Doppler to increase the signal intensity. However, the ultrasound system must be suitable for contrast enhanced technology.
Microbubbles usually stay within the vascular space; nevertheless, the contrast enhancement is limited to 2–6 minutes caused by physiologic clearance and bubble destruction.
Depended on the application, contrast agents can be administered with a different injection rate e.g., bolus injection, slow injection, or continuous infusion. Stable, homogeneous, and prolonged enhancement can be obtained with perfusion, lasting until the infusion is stopped.
See also Cerebrovascular Ultrasonography, Multiple Frame Trigger.
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 Further Reading:
  Basics:
Continuous Infusion Versus Bolus Injection Of Ultrasound Contrast Agents in Vascular Doppler Flow Imaging Response(.pdf)Open this link in a new window
Friday, 1 September 2000   by stroke.ahajournals.org    
  News & More:
Carotid artery color doppler ultrasound: 80-90% stenosis of the proximal internal carotid artery secondary to large atherosclerotic plaquesOpen this link in a new window
   by rad.usuhs.mil    
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Radiology  (11) Open this link in a new windowMRI  (82) Open this link in a new window
Contrast Enhanced UltrasoundInfoSheet: - Contrast Agents - 
Intro, 
Historical Development, 
Microbubbles,
etc.MRI Resource Directory:<br> - Vascular -
 
(CEUS) Contrast agents increase the reflection of ultrasonic energy, improve the signal to noise ratio and caused by that the detection of abnormal microvascular and macrovascular disorders. Contrast enhanced ultrasound is used in abdominal ultrasound (liver sonography) as well as in cerebrovascular examinations e.g., for an accurate grading of carotid stenosis. The used contrast agents are safe and well tolerated.

The quality of the enhancement depends on:
point the concentration of the contrast agent;
point the type of injection, flow rate;
point the patient characteristics;
point the microbubble quality and properties of the filling gas and the shell.
The additional use of ultrasound contrast agents (USCAs) may overcome typical limitations like poor contrast of B-mode imaging or limited sensitivity of Doppler techniques. The development of new ultrasound applications (e.g., blood flow imaging, perfusion quantification) depends also from the development of pulse sequences for bubble specific imaging. In addition, contrast enhanced ultrasound improves the monitoring of ultrasound guided interventions like RF thermal ablation.
See also Contrast Enhanced Doppler Imaging, Contrast Harmonic Imaging, Contrast Imaging Techniques and Contrast Pulse Sequencing.
Radiology-tip.comContrast Enhanced Computed Tomography
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Radiology-tip.comContrast Enhanced MRI
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• View the news results for 'Contrast Enhanced Ultrasound' (1).



 Further Reading:
  Basics:
Guidelines and Good Clinical Practice Recommendations for Contrast Enhanced Ultrasound (CEUS)Open this link in a new window
2008   by www.efsumb.org    
  News & More:
Role of ultrasound and contrast-enhanced ultrasound in patients with cerebrovascular disease(.pdf)Open this link in a new window
Friday, 1 March 2002   by eurheartjsupp.oupjournals.org    
The clinical applications of contrast echocardiography(.pdf)Open this link in a new window
2000   by cme.medscape.com     
US Resources  
UltraSound Reimbursement - RIS - Resources - General - Pelvic - Breast
 
Related Searches:
 • Contrast Enhanced Ultrasound
 • Contrast Enhanced Doppler Imaging
 • Ultrasound Contrast Agents
 • Microbubbles
 • Beam Pattern
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