Medical Ultrasound Imaging
Sunday, 28 April 2024
 Info Sheets  Out- side     | ' Diffusion' Searchterm 'Diffusion' found in 2 articles 2 definitions [ • ] Result Pages : •
A microbubble shell, designed to reduce diffusion into the blood, can be stiff (e.g., denatured albumin) or more flexible (phospholipid), varying in thickness from 10-200 nm. The shell stabilizes against dissolution and coalescence with additional materials at the gas-liquid interface. This material can be an elastic solid shell that enhances stability by supporting a strain to counter the effect of surface tension. Also a surfactant, or a combination of two or more, improves the stability by a high reduction of the surface tension at the interface. Current ultrasound contrast agents are micron-sized bubbles with a stabilizing shell.  Further Reading: Basics: News & More:
•
Perfluorochemicals are used as microbubble filling gases because of their low solubility in blood and high vapor pressure. Various types of perfluorochemical gases like perfluorocarbon, perfluorobutane, perfluoropropane, and perfluorohexane are used to substitute the air in microbubbles to improve the stability and plasma longevity of the agents.
Perfluorocarbons are liquids at room temperature but gas at body temperature. The large molecules of perfluorocarbons have slow diffusion and solubility which increase the enhancement time of the ultrasound contrast agent as compared to air. See also Filling Gas, and PESDA. Further Reading: Basics:
Result Pages : | Share This Page     Look Ups |
(.pdf)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]