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Related Experiment Videos

An electric field measurement system, using two-dimensional array of diodes.

R S Kaatee1, G C van Rhoon

  • 1University Hospital Rotterdam-Daniel den Hoed Cancer Center, Department of Clinical Physics, Rotterdam, The Netherlands. kaatee@kfih.azr.nl

International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group
|October 16, 1999
PubMed
Summary

This study introduces a novel 2D diode array system for measuring electric field (E) distributions on patient skin during hyperthermia cancer treatments. The system provides accurate, real-time feedback for applicator power control, enhancing treatment efficacy.

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Area of Science:

  • Biomedical Engineering
  • Medical Physics
  • Electromagnetics

Background:

  • Accurate measurement of electric field (E) strength is crucial for understanding energy absorption in electromagnetic hyperthermia treatments.
  • Current methods may lack the spatial resolution or real-time feedback needed for precise applicator power control during superficial tumor treatments.

Purpose of the Study:

  • To develop and validate a novel 2D diode array system for measuring E-field distributions on patient skin.
  • To provide real-time feedback for controlling power delivered by electromagnetic applicators during hyperthermia therapy.
  • To assess the system's accuracy by comparing its measurements with infrared thermography.

Main Methods:

  • A 2D array of Schottky diode sensors (2.5 cm spacing) with carbon ink printed leads was fabricated.

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  • Rectified diode voltages were multiplexed, digitized (AD-DA card), and processed on a PC.
  • System performance was evaluated using phantom measurements under different applicators (LCA, CSA) and compared with infrared temperature rise data.

    • Main Results:

    • The system successfully measured relative E-field distributions using 64 sensors, updated within 1 second.
    • A fair agreement was observed between the square of diode voltages and infrared temperature distributions.
    • The system clearly visualized applicator movements and provided accurate feedback for power steering.

    Conclusions:

    • The developed 2D diode matrix E-field measurement system is fast, accurate, and provides valuable feedback for hyperthermia applicator power control.
    • This system has significant potential for quality assurance in hyperthermia treatments and other related fields.