Abstract
A theoretical model was established to study interaction between ultrasound contrast agents (UCAs, called microbubbles) and compliant microvessels. The predicted microbubble expansion and vessel wall displacement are in good agreement with the ex vivo experimental results using the rat cecum vessels for ultrasound with a center frequency of IMHz and a PRP (peak rarefactional pressure) of 800kPa. We demonstrate that compared to the bubble oscillation within an infinite liquid or within a 200-micron tube, bubble maximum expansion within the small vessels is substantially reduced. With two-cycle 1 MHz, 0.8 MPa PRP ultrasound, the relative expansion of the shelled microbubbles with a diameter of 4 and 7.2-μm estimated by the Rayleigh-Plesset equation is 4.1 and 3.0, respectively, while within a 14-μm vessel, we observed that the bubble expansion was 2.6 and 1.3-fold, respectively. Our model predicted that the corresponding relative expansion is 2.6 and 1.8, respectively. With 0.8 MPa PRP, 1 MHZ ultrasound, a 4 pm bubble within a 25 μm vessel can displace the vessel wall up to 2 microns and induce a circumferential stress near 36kPa.
| Original language | English (US) |
|---|---|
| Title of host publication | Proceedings - IEEE Ultrasonics Symposium |
| Pages | 1981-1984 |
| Number of pages | 4 |
| DOIs | |
| State | Published - 2007 |
| Event | 2007 IEEE Ultrasonics Symposium, IUS - New York, NY, United States Duration: Oct 28 2007 → Oct 31 2007 |
Other
| Other | 2007 IEEE Ultrasonics Symposium, IUS |
|---|---|
| Country | United States |
| City | New York, NY |
| Period | 10/28/07 → 10/31/07 |
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Keywords
- Microbubbles
- Rat cecum vessel
- Ultrasound contrast agents
- Vessel deformation
ASJC Scopus subject areas
- Engineering(all)
Cite this
Dynamics of ultrasound contrast agents within rat cecum vessels. / Qin, Shengping; Caskey, Charles F.; Ferrara, Katherine W.
Proceedings - IEEE Ultrasonics Symposium. 2007. p. 1981-1984 4410071.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Dynamics of ultrasound contrast agents within rat cecum vessels
AU - Qin, Shengping
AU - Caskey, Charles F.
AU - Ferrara, Katherine W.
PY - 2007
Y1 - 2007
N2 - A theoretical model was established to study interaction between ultrasound contrast agents (UCAs, called microbubbles) and compliant microvessels. The predicted microbubble expansion and vessel wall displacement are in good agreement with the ex vivo experimental results using the rat cecum vessels for ultrasound with a center frequency of IMHz and a PRP (peak rarefactional pressure) of 800kPa. We demonstrate that compared to the bubble oscillation within an infinite liquid or within a 200-micron tube, bubble maximum expansion within the small vessels is substantially reduced. With two-cycle 1 MHz, 0.8 MPa PRP ultrasound, the relative expansion of the shelled microbubbles with a diameter of 4 and 7.2-μm estimated by the Rayleigh-Plesset equation is 4.1 and 3.0, respectively, while within a 14-μm vessel, we observed that the bubble expansion was 2.6 and 1.3-fold, respectively. Our model predicted that the corresponding relative expansion is 2.6 and 1.8, respectively. With 0.8 MPa PRP, 1 MHZ ultrasound, a 4 pm bubble within a 25 μm vessel can displace the vessel wall up to 2 microns and induce a circumferential stress near 36kPa.
AB - A theoretical model was established to study interaction between ultrasound contrast agents (UCAs, called microbubbles) and compliant microvessels. The predicted microbubble expansion and vessel wall displacement are in good agreement with the ex vivo experimental results using the rat cecum vessels for ultrasound with a center frequency of IMHz and a PRP (peak rarefactional pressure) of 800kPa. We demonstrate that compared to the bubble oscillation within an infinite liquid or within a 200-micron tube, bubble maximum expansion within the small vessels is substantially reduced. With two-cycle 1 MHz, 0.8 MPa PRP ultrasound, the relative expansion of the shelled microbubbles with a diameter of 4 and 7.2-μm estimated by the Rayleigh-Plesset equation is 4.1 and 3.0, respectively, while within a 14-μm vessel, we observed that the bubble expansion was 2.6 and 1.3-fold, respectively. Our model predicted that the corresponding relative expansion is 2.6 and 1.8, respectively. With 0.8 MPa PRP, 1 MHZ ultrasound, a 4 pm bubble within a 25 μm vessel can displace the vessel wall up to 2 microns and induce a circumferential stress near 36kPa.
KW - Microbubbles
KW - Rat cecum vessel
KW - Ultrasound contrast agents
KW - Vessel deformation
UR - http://www.scopus.com/inward/record.url?scp=48149096871&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=48149096871&partnerID=8YFLogxK
U2 - 10.1109/ULTSYM.2007.498
DO - 10.1109/ULTSYM.2007.498
M3 - Conference contribution
AN - SCOPUS:48149096871
SN - 1424413834
SN - 9781424413836
SP - 1981
EP - 1984
BT - Proceedings - IEEE Ultrasonics Symposium
ER -