Electromagnetic thermal therapy power optimization for multiple source applicators.

Published

Journal Article

The optimization of power deposition for electromagnetic (EM) thermal therapy is investigated. Several goal or objective functions are examined using a generalized mathematical formulation. These include maximization of: (1) target power absorption, (2) the ratio of target to non-target power absorption, (3) target power absorption weighted by the ratio of target to non-target power absorption, and (4) target power absorption subject to the constraint that the non-target high power volume ('hot spot' volume) is below a chosen level. The merit of these functions was retrospectively tested using an anatomic data base containing 38 cancer patients that were clinically heated with EM phased arrays. CT and/or MRI image data were used to define relevant anatomic geometries and tissue properties for finite element numerical models. Power optimization is achieved by variation of seven available control parameters (four amplitudes and three phases) for these clinical array devices. The results indicate that site dependent improvements in target power absorption can be achieved using these goal functions relative to a configuration that utilizes equal phase and amplitude for the sources. The relative merit among these various functions favours an optimization strategy that maximizes the target power absorption weighted by the ratio of target power to non-target power absorption.

Full Text

Duke Authors

Cited Authors

  • Das, SK; Clegg, ST; Samulski, TV

Published Date

  • July 1999

Published In

Volume / Issue

  • 15 / 4

Start / End Page

  • 291 - 308

PubMed ID

  • 10458569

Pubmed Central ID

  • 10458569

International Standard Serial Number (ISSN)

  • 0265-6736

Language

  • eng

Conference Location

  • England