Document Detail


Spatial steering with quadruple electrodes in 27 MHz capacitively coupled interstitial hyperthermia.
MedLine Citation:
PMID:  10323621     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: The 27 MHz Multi Electrode Current Source (MECS) interstitial hyperthermia system uses probes consisting of multiple independent electrodes, 10-20 mm long, to steer the 3-D power deposition. Seven point thermocouples integrated into the probes provide matching 3-D temperature feedback data. To improve spatial steering the number of independent segments was increased; the feasibility and reliability of four independent electrodes integrated into a single probe were evaluated, with special attention to efficiency and to interference between separate electrodes. METHODS: The contribution of secondary coupling on the apparent electrode impedance and the dependence of cross coupling on the distance between leads, thermocouple and electrodes are computed using simple analytical models. The effect of this secondary coupling was assessed experimentally by comparing power delivery by dual and quadruple electrodes, and by quadruple electrodes in different electrode configurations (segment length 10 or 20 mm) in a nylon catheter in a muscle equivalent medium. RESULTS: Cross coupling with the thermocouple and other electrodes was computed to be of the same magnitude as the primary coupling for a quadruple electrode. Fortunately, this does not affect operation of the electrode, there was no difference in performance between quadruple and dual electrodes, and the output power was effectively independent of the electrode configuration. CONCLUSION: Quadruple MECS electrodes for improved 3-D power control are feasible.
Authors:
J Crezee; R S Kaatee; J F van der Koijk; J J Lagendijk
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of hyperthermia : the official journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group     Volume:  15     ISSN:  0265-6736     ISO Abbreviation:  Int J Hyperthermia     Publication Date:    1999 Mar-Apr
Date Detail:
Created Date:  1999-06-09     Completed Date:  1999-06-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8508395     Medline TA:  Int J Hyperthermia     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  145-56     Citation Subset:  IM    
Affiliation:
Department of Radiotherapy, University Hospital Utrecht, The Netherlands.
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MeSH Terms
Descriptor/Qualifier:
Electrodes*
Hyperthermia, Induced / instrumentation*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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