Medical Ultrasound Imaging
Sunday, 19 May 2024
 Info Sheets  Out- side     | 'Pancreas Ultrasound' p3 Searchterm 'Pancreas Ultrasound' found in 11 articles 11 booleans [ • ]Result Pages : •
Vascular ultrasound contrast agents are gas microbubbles with a diameter less than 10 μm (2 to 5 μm on average for most of the newer agents) to pass through the lung capillaries and enter into the systemic circulation. Air bubbles in that size persist in solution for only a short time; too short for systemic vascular use in medical ultrasound imaging. So the gas bubbles have to be stabilized to persist long enough and survive pressure changes in the heart. Most vascular contrast media are stabilized against dissolution and coalescence by the presence of additional materials at the gas-liquid interface. In some cases, this material is an elastic solid shell that enhances stability by supporting a strain to counter the effect of surface tension. In other cases, the material is a surfactant, or a combination of two or more surfactants. Typically the effective duration of vascular enhancement is a few minutes, after which the microbubbles dissipate. This rather short duration of vascular enhancement makes it easy to perform repeated dynamic studies. Intravenous vascular contrast agents will be used in imaging malignant tumors in the liver, kidney, ovary, pancreas, prostate, and breast. Tumor neovascularization can be a marker for angiogenesis, and Doppler signals from small tumor vessels may be detectable after contrast injection. Contrast agents are useful for evaluating vessels in a variety of organs, including those involved in renal, hepatic, and pancreatic transplants. If an area of ischemia or a stenosis is detected after contrast administration, the use of other more expensive imaging modalities, including CT and MRI, can often be avoided. See also Acoustically Active Lipospheres. • View NEWS results for 'Vascular Ultrasound Contrast Agents' (1).  Result Pages : | Share This Page     Look Ups |
Medical-Ultrasound-Imaging.com
former US-TIP.com
Member of SoftWays' Medical Imaging Group - MR-TIP • Radiology TIP • Medical-Ultrasound-Imaging
Copyright © 2008 - 2024 SoftWays. All rights reserved.
Terms of Use | Privacy Policy | Advertise With Us
former US-TIP.com
Member of SoftWays' Medical Imaging Group - MR-TIP • Radiology TIP • Medical-Ultrasound-Imaging
Copyright © 2008 - 2024 SoftWays. All rights reserved.
Terms of Use | Privacy Policy | Advertise With Us
[last update: 2023-11-06 01:42:00]