Journal article
Subharmonic backscattering from ultrasound contrast agents
The Journal of the Acoustical Society of America, v 106(4 Pt 1), pp 2104-2110
Oct 1999
PMID: 10530033
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The ultrasonic contrast of blood in tissue, which is needed for ultrasonic estimation of tissue perfusion, can be increased by injecting the blood with bubbles or hollow microspheres. It has been shown that an even greater improvement in contrast can be obtained by using the subharmonic generated by irradiated microspheres. By obtaining analytical solutions to the modified RPNNP equation for a coated microbubble, the relationship between the physical parameters of the encapsulated bubble and the threshold pressure is established. The observed increase in the resonance frequency of a coated microsphere is explained by introducing the concept of "acoustic radius" of the encapsulated bubble. It is predicted that subharmonic generation in contrast agents requires a threshold insonifying pressure, and should be a minimum when microspheres are insonated at twice their resonance frequency. Experiments confirm the existence of this optimum incident frequency and of a reasonably low threshold pressure for the generation of the subharmonic. The existence of the low threshold pressures for subharmonic generation in contrast agents may prove to be very valuable in ultrasonic contrast imaging.
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Details
- Title
- Subharmonic backscattering from ultrasound contrast agents
- Creators
- P M Shankar - Drexel UniversityP D KrishnaV L Newhouse
- Publication Details
- The Journal of the Acoustical Society of America, v 106(4 Pt 1), pp 2104-2110
- Grant note
- CA 52823 / NCI NIH HHS
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Electrical and Computer Engineering; [Retired Faculty]
- Web of Science ID
- WOS:000083071300047
- Scopus ID
- 2-s2.0-0032875232
- Other Identifier
- 991019167636404721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Acoustics
- Audiology & Speech-language Pathology