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Proceedings Paper

Computational modeling of high-intensity focused ultrasound mediated drug delivery
Author(s): Astrid Gasselhuber; Sunil Appanaboyina; Matthew Dreher; Ari Partanen; Bradford Wood; Frank Rattay; Dieter Haemmerich
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Paper Abstract

Low temperature sensitive liposomes (LTSL) are drug delivery vehicles with long plasma half-life, which release the drug upon heating above ~40°C. The combination of LTSL with local heat generated by image-guided focused ultrasound may thus allow non-invasively targeted drug delivery. We combined a heat-transfer model with a drug delivery model to determine temperature-dependent release and tumor tissue accumulation of drug in extravascular-extracellular space, and inside cells. Tissue was heated with a 16 mm focal spot for 7 min at 43°C target temperature. In addition we examined the effect of an additional subsequent high-temperature pulse to eliminate blood flow after drug release. Our results show high local plasma concentration during hyperthermia at the target site, during which drug is taken up by tissue and finally by cells. Following heating, local plasma concentration rapidly drops off and drug not taken up by cells is removed from tissue by blood flow. Elimination of blood flow following hyperthermia by a high-temperature pulse avoided this removal and resulted in ~2x higher intracellular concentration.

Paper Details

Date Published: 23 February 2011
PDF: 8 pages
Proc. SPIE 7901, Energy-based Treatment of Tissue and Assessment VI, 79010F (23 February 2011); doi: 10.1117/12.875660
Show Author Affiliations
Astrid Gasselhuber, Medical Univ. of South Carolina (United States)
Vienna Univ. of Technology (Austria)
Sunil Appanaboyina, Medical Univ. of South Carolina (United States)
Matthew Dreher, National Cancer Institute (United States)
Ari Partanen, National Cancer Institute (United States)
Bradford Wood, National Cancer Institute (United States)
Frank Rattay, Vienna Univ. of Technology (Austria)
Dieter Haemmerich, Medical Univ. of South Carolina (United States)
Clemson Univ. (United States)


Published in SPIE Proceedings Vol. 7901:
Energy-based Treatment of Tissue and Assessment VI
Thomas P. Ryan, Editor(s)

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