Contribution of Direct Heating, Thermal Conduction and Perfusion during Radiofrequency and Microwave Ablation.

Contribution of Direct Heating, Thermal Conduction and Perfusion during Radiofrequency and Microwave Ablation. Research Abstract Details 

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Contribution of Direct Heating, Thermal Conduction and Perfusion during Radiofrequency and Microwave Ablation. Abstract Text:

W Schramm,D Yang,D Haemmerich,W Schramm,D Yang,D Haemmerich,

Heat based tumor ablation methods such as radiofrequency (RF) and microwave (MW) ablation are increasingly accepted treatment methods for tumors not treatable by traditional surgery. Typically, an interstitial applicator is introduced under imaging guidance into the tumor, and tissue is destroyed by heating to above -50degC, with maximum tissue temperatures over 100degC. Since high thermal gradients occur during the procedure, thermal conduction contributes significantly towards tissue heating. We created finite element method (FEM) computer models of RF and MW applicators, and determined the thermal conduction term, the resistive (for RF) or dielectric (for MW) loss term, and perfusion term. We integrated these terms over the heating period to obtain relative contribution towards tissue temperature rise (indegC) as a function of distance from the applicator. We performed simulations without and with perfusion, where perfusion was assumed to stop above 50degC. During the first 6 minutes, direct heating by RF and MW were dominating throughout the tissue. Over the treatment period (12 min for RF, and 6 min for MW), thermal conduction was dominating at distances between than 12 and 19 mm from the RF electrode, while for MW ablation direct heating dominated everywhere. Even though thermal conduction significantly contributes towards tissue heating during ablative therapies, direct heating by RF or MW is dominating throughout most of the tissue volume. Tissue cooling due to perfusion is more significant during RF heating, in part due to the longer treatment times.

Contribution of Direct Heating, Thermal Conduction and Perfusion during Radiofrequency and Microwave Ablation. Publishing Authors By Initials

W Schramm,D Yang,D Haemmerich,W Schramm,D Yang,D Haemmerich,

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Contribution of Direct Heating, Thermal Conduction and Perfusion during Radiofrequency and Microwave Ablation. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Conference proceedings : ... Annual International

VOLUME: 1

Page Numbers: 5013-6

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ISSN: 1557-170X

DAY: 23

MONTH: 10

YEAR: 2006

Contribution of Direct Heating, Thermal Conduction and Perfusion during Radiofrequency and Microwave Ablation. Information

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LANGUAGE: eng

NlmUniqueID: 101243413

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Grant and Affiliation Information for Contribution of Direct Heating, Thermal Conduction and Perfusion during Radiofrequency and Microwave Ablation.

AFFILIATION: Div. of Pediatric Cardiology, South Carolina Med. Univ., Charleston, SC.

Country: United States

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MEDLINETA: Conf Proc IEEE Eng Med Biol So

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