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PubMed · 6505143

Theoretical temperature distributions produced by an annular phased array-type system in CT-based patient models.

K D Paulsen·J W Strohbehn·D R Lynch
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Abstract

Theoretical calculations for the specific absorption rate (SAR) and the resulting temperature distributions produced by an annular phased array (APA)-type system are made. The finite element numerical method is used in the formulation of both the electromagnetic (EM) and thermal boundary value problems. A number of detailed two-dimensional patient models based on CT-scan data from the pelvic, visceral, and thoracic regions are generated to simulate a variety of tumor locations and surrounding normal tissues. The SAR values from the EM solution are put into the bioheat transfer equation, and steady-state temperature distributions are calculated for a wide range of blood flow rates. Based on our theoretical modeling, the APA shows no preferential heating of superficial over deep-seated tumors. However, in most cases for all three regions of the human trunk only fair thermal profiles (therapeutic area near 60%) are obtained in tumors with little or no blood flow and poor temperature patterns (therapeutic area less than 50%) are found in tumors with moderate to high perfusion rates. These theoretical calculations should aid the clinician in the evaluation of the effectiveness of APA-type devices in heating tumors located in the trunk region.

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HumansHyperthermia, InducedMicrowavesModels, BiologicalNeoplasmsTemperatureTomography, X-Ray ComputedJournal ArticleResearch Support, U.S. Gov't, Non-P.H.S.Research Support, U.S. Gov't, P.H.S.

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K D Paulsen, J W Strohbehn, D R Lynch. 1984. Theoretical temperature distributions produced by an annular phased array-type system in CT-based patient models.. https://pubmed.ncbi.nlm.nih.gov/6505143/

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