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Finite difference time domain modelling of hyperthermia applicators for cancer therapy

Research output: Contribution to conferenceAbstract

  • NM Pothecary
  • CJ Railton
Original languageEnglish
Pages1151 - 1154
StatePublished - 1993


An enhanced version of the finite-difference-time-domain (FDTD) method is used to calculate the field penetration and specific absorption rate (SAR) pattern for a current sheet applicator used in hyperthermia treatment. The FDTD method uses modified equations to rigorously model three-dimensional dielectric boundaries and a nonuniform grid for computational efficiency. Results obtained using the FDTD method are compared with experimental measurements made on phantoms, and excellent agreement is obtained. It is found both experimentally and theoretically that at low phantom conductivities the penetration depth is almost independent of conductivity due to the presence of circulating currents. In addition, the SAR pattern (calculated and measured) shows two null spots whose positions are correctly predicted by the FDTD method and match experimental measurements.

Additional information

Sponsorship: The authors would like to thank Prof J.P. McGeehan for provision of facilities at the Centre for Communications Research and are grateful to GPT Ltd and SERC UK for financial support. Terms of use: Copyright © 1993 IEEE. Reprinted from IEEE MTT-S International Microwave Symposium, 1993. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it. Name of Conference: IEEE MTT-S International Microwave Symposium Venue of Conference: Atlanta, GA, USA

    Research areas

  • finite difference time-domain analysis (FDTD), biothermics

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