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Proceedings Paper

Thermal dose requirement for tissue effect: experimental and clinical findings
Author(s): Mark Dewhirst; Benjamin L. Viglianti; Michael Lora-Michiels; P. Jack Hoopes D.V.M.; Margaret A. Hanson
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Paper Abstract

In this review we have summarized the basic principles that govern the relationships between thermal exposure (temperature and time of exposure) and thermal damage, with an emphasis on normal tissue effects. We have also attempted to identify specific thermal dose information (for safety and injury) for a variety of tissues in a variety of species. We address the use, accuracy and difficulty of conversion of an individual time and temperature (thermal dose) to a standardized value (eg equivalent minutes at 43degC) for comparison of thermal treatments. Although, the conversion algorithm appears to work well within a range of moderately elevated temperatures (2-15degC) above normal physiologic baseline (37-39degC) there is concern that conversion accuracy does not hold up for temperatures which are minimally or significantly above baseline. An extensive review of the literature suggests a comprehensive assessment of the "thermal dose-to-tissue effect" has not previously been assembled for most individual tissues and never been viewed in a semi-comprehensive (tissues and species) manner. Finally, we have addressed the relationship of thermal dose-to-effect vs. baseline temperature. This issues is important since much of the thermal dose-to-effect information has been accrued in animal models with baseline temperatures 1-2 deg higher than that of humans.

Paper Details

Date Published: 10 June 2003
PDF: 21 pages
Proc. SPIE 4954, Thermal Treatment of Tissue: Energy Delivery and Assessment II, (10 June 2003); doi: 10.1117/12.476637
Show Author Affiliations
Mark Dewhirst, Duke Univ. Medical Ctr. (United States)
Benjamin L. Viglianti, Duke Univ. Medical Ctr. (United States)
Michael Lora-Michiels, Duke Univ. Medical Ctr. (United States)
P. Jack Hoopes D.V.M., Dartmouth Medical School (United States)
Margaret A. Hanson, Dartmouth Medical School (United States)

Published in SPIE Proceedings Vol. 4954:
Thermal Treatment of Tissue: Energy Delivery and Assessment II
Thomas P. Ryan, Editor(s)

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