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Absorbed power distributions from two tilted waveguide applicators

Nilsson, P. LU orcid ; Larsson, T. LU and Persson, B. LU orcid (1985) In International Journal of Hyperthermia 1(1). p.29-43
Abstract

One major problem in microwave-induced clinical hyperthermia treatment of superficial tumours is to obtain therapeutic temperatures at the tumour periphery and adequate deep heating when using a single applicator. The use of multiple applicators has therefore been investigated in order to improve the power distribution. Anatomical surface topography often permits the application of two tilted applicators, e.g. in the head and neck area, on extremities and on large protruding tumours. Theoretical calculations of the absorbed power distribution from such an applicator configuration were performed in a homogeneous muscle equivalent medium. The power distribution from two conventional radiative apertures (TE10) was studied at... (More)

One major problem in microwave-induced clinical hyperthermia treatment of superficial tumours is to obtain therapeutic temperatures at the tumour periphery and adequate deep heating when using a single applicator. The use of multiple applicators has therefore been investigated in order to improve the power distribution. Anatomical surface topography often permits the application of two tilted applicators, e.g. in the head and neck area, on extremities and on large protruding tumours. Theoretical calculations of the absorbed power distribution from such an applicator configuration were performed in a homogeneous muscle equivalent medium. The power distribution from two conventional radiative apertures (TE10) was studied at different frequencies, aperture sizes, tilting angles and non-coherent or coherent fields in phase, both theoretically and with phantom experiments using a thermographic camera. With controlled phase relations between two tilted applicators excited at the lower microwave or upper radiofrequency band, the absorbed power distribution can be varied in a wide range. The theoretical calculations and thermographic phantom experiments in simple geometries give valuable information on absorbed power distributions and guidance for the location of temperature probes in clinical hyperthermia.

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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
keywords
200 MHz, 434 MHz, Coherent fields, Dual applicators, Hyperthermia, Power distributions
in
International Journal of Hyperthermia
volume
1
issue
1
pages
15 pages
publisher
Taylor & Francis
external identifiers
  • scopus:0022296184
  • pmid:3837079
ISSN
0265-6736
DOI
10.3109/02656738509029272
language
English
LU publication?
yes
id
3740b57a-3972-45aa-8485-72efedbb8e93
date added to LUP
2020-05-07 21:23:38
date last changed
2024-01-02 10:52:21
@article{3740b57a-3972-45aa-8485-72efedbb8e93,
  abstract     = {{<p>One major problem in microwave-induced clinical hyperthermia treatment of superficial tumours is to obtain therapeutic temperatures at the tumour periphery and adequate deep heating when using a single applicator. The use of multiple applicators has therefore been investigated in order to improve the power distribution. Anatomical surface topography often permits the application of two tilted applicators, e.g. in the head and neck area, on extremities and on large protruding tumours. Theoretical calculations of the absorbed power distribution from such an applicator configuration were performed in a homogeneous muscle equivalent medium. The power distribution from two conventional radiative apertures (TE<sub>10</sub>) was studied at different frequencies, aperture sizes, tilting angles and non-coherent or coherent fields in phase, both theoretically and with phantom experiments using a thermographic camera. With controlled phase relations between two tilted applicators excited at the lower microwave or upper radiofrequency band, the absorbed power distribution can be varied in a wide range. The theoretical calculations and thermographic phantom experiments in simple geometries give valuable information on absorbed power distributions and guidance for the location of temperature probes in clinical hyperthermia.</p>}},
  author       = {{Nilsson, P. and Larsson, T. and Persson, B.}},
  issn         = {{0265-6736}},
  keywords     = {{200 MHz; 434 MHz; Coherent fields; Dual applicators; Hyperthermia; Power distributions}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{1}},
  pages        = {{29--43}},
  publisher    = {{Taylor & Francis}},
  series       = {{International Journal of Hyperthermia}},
  title        = {{Absorbed power distributions from two tilted waveguide applicators}},
  url          = {{http://dx.doi.org/10.3109/02656738509029272}},
  doi          = {{10.3109/02656738509029272}},
  volume       = {{1}},
  year         = {{1985}},
}