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Calculated RF electric field and temperature distributions in RF thermal ablation: Comparison with gel experiments and liver imaging
Author(s) -
Cheng YuChung N.,
Brown Robert W.,
Chung YiuCho,
Duerk Jeffrey L.,
Fujita Hiroyuki,
Lewin Jonathan S.,
Schuele Donald E.,
Shvartsman Shmaryu
Publication year - 1998
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880080116
Subject(s) - ablation , radiofrequency ablation , materials science , rf ablation , thermal ablation , ablation zone , rf probe , electric field , biomedical engineering , thermal , current (fluid) , joule heating , optoelectronics , medicine , composite material , physics , thermodynamics , rf power amplifier , amplifier , cmos , quantum mechanics
The present paper is a study of theoretic modeling and experimental tests of that modeling for the local heating due to radiofrequency thermal ablation. A model is developed for the current and the associated electric field produced by a radiofrequency ablation probe. The temperature distributions resulting from the induced ohmic currents in the surrounding material are considered. A comparison is made between the theoretic temperature profiles and the shapes of thermal ablation ‘lesions’ produced in a controlled gelatin sample experiment. Comparison with the contours of human thermally induced liver lesions found in MRI studies also provides a validation of the success of the modeling. Successful modeling should lead to methods for optimization of the ablation procedure, especially as it is used in interventional MRI.