id:"swepub:oai:DiVA.org:kth-26979"
Sökning: id:"swepub:oai:DiVA.org:kth-26979" > On the acoustic pro...
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- Grishenkov, Dmitry,1983-KTH,MWL Ultraljud (författare)
On the acoustic properties of polymer-shell ultrasonic contrast agents.
- Artikel/kapitelEngelska2008
Förlag, utgivningsår, omfång ...
- 2008
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:kth-26979
- https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26979URI
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- Språk:engelska
- Sammanfattning på:engelska
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Anmärkningar
- QC 20101209
- Polymer-shelled microbubbles have become the focus of intense research for their enhanced shelf life and demonstrated chemical versatility. These are properties highly sought after in the ultrasonic contrast agents (UCAs) of the next generation, which will be engineered not only to enhance the contrast of ultrasound-based images, but also to function as carriers of drugs to be delivered locally. Here, the results of an experimental investigation of three potentially new UCAs are presented. These microbubbles are stabilized by thick poly (vinyl alcohol) shells. These UCAs differ from each other in their dimensions and shell thickness (order of 0.5 microns). Fundamental to their use as drug carrier is the knowledge of the pressure threshold at which the shell of these UCAs fractures. Therefore, the dependence of this quantity on temperature, number of cycles of the incident pulse, nominal central frequency and pulse repetition frequency of the emitting transducer is examined. The effect of using blood instead of deionized water is also considered. The main conclusion to be drawn from these results is that their thick shell notwithstanding, these microbubbles begin to fracture at values of MI which can be acceptable in clinical applications. This claim is supported also by images acquired by means of commercially available imaging systems. Finally, these values of the pressure threshold are correlated with estimates of the shells’ visco-elastic constants obtained by fitting Church’s model to the frequency-dependent attenuation coefficient and phase velocity. Open questions arising from this comparison are briefly discussed.
Ämnesord och genrebeteckningar
- TEKNIK OCH TEKNOLOGIER Maskinteknik Strömningsmekanik och akustik hsv//swe
- ENGINEERING AND TECHNOLOGY Mechanical Engineering Fluid Mechanics and Acoustics hsv//eng
- TEKNIK OCH TEKNOLOGIER Medicinteknik Medicinsk laboratorie- och mätteknik hsv//swe
- ENGINEERING AND TECHNOLOGY Medical Engineering Medical Laboratory and Measurements Technologies hsv//eng
- Microbubble
- ultrasound
- contrast agent
- attenuation
- phase velocity
- Acoustics
- Akustik
- Medical engineering
- Medicinsk teknik
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Pecorari, ClaudioKTH,MWL Ultraljud(Swepub:kth)u13txzn0 (författare)
- Brismar, Torkel B.Karolinska University Hospital,CLINTEC, Department of Radiology (författare)
- Paradossi, GaioUniversità di Roma Tor Vergata,Dipartimento di Chimica (författare)
- KTHMWL Ultraljud (creator_code:org_t)
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