Document Detail


A new simplified bioheat equation for the effect of blood flow on local average tissue temperature.
MedLine Citation:
PMID:  3999709     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A new simplified three-dimensional bioheat equation is derived to describe the effect of blood flow on blood-tissue heat transfer. In two recent theoretical and experimental studies [1, 2] the authors have demonstrated that the so-called isotropic blood perfusion term in the existing bioheat equation is negligible because of the microvascular organization, and that the primary mechanism for blood-tissue energy exchange is incomplete countercurrent exchange in the thermally significant microvessels. The new theory to describe this basic mechanism shows that the vascularization of tissue causes it to behave as an anisotropic heat transfer medium. A remarkably simple expression is derived for the tensor conductivity of the tissue as a function of the local vascular geometry and flow velocity in the thermally significant countercurrent vessels. It is also shown that directed as opposed to isotropic blood perfusion between the countercurrent vessels can have a significant influence on heat transfer in regions where the countercurrent vessels are under 70-micron diameter. The new bioheat equation also describes this mechanism.
Authors:
S Weinbaum; L M Jiji
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of biomechanical engineering     Volume:  107     ISSN:  0148-0731     ISO Abbreviation:  J Biomech Eng     Publication Date:  1985 May 
Date Detail:
Created Date:  1985-07-25     Completed Date:  1985-07-25     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7909584     Medline TA:  J Biomech Eng     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  131-9     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Circulation*
Body Temperature*
Hot Temperature*
Mathematics
Models, Biological
Rabbits
Grant Support
ID/Acronym/Agency:
5 RO1 HL 26090/HL/NHLBI NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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