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Performance evaluation of various antenna configurations for microwave thermography during superficial hyperthermia

Journal of Electromagnetic Waves and Applications, ISSN: 1569-3937, Vol: 15, Issue: 1, Page: 111-134
2001
  • 16
    Citations
  • 0
    Usage
  • 6
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    16
    • Citation Indexes
      16
  • Captures
    6

Article Description

Microwave thermography is currently under investigation for its potential in non-invasive monitoring and control of tissue tem- perature during superficial microwave hyperthermia treatments. In this effort, six antennas were tested for their suitability as radiometric probes in terms of penetration depth, signal-to-noise ratio, and the sensitivity and accuracy of measured temperature signals over the frequency range from 1.2-3.5 GHz. Due to the intended integration of this radiometry technique with large area multi-aperture heat applicators such as Dual Concentric Conductor (DCC) arrays, the size of each receive antenna was limited to 4 cm. The performance of logarithmic and Archimedean spiral microstrip structures was compared to dielectric loaded waveguide antennas. Results showed adequate signal- to-noise ratio for all antennas at frequencies above 2.5 GHz and for all antennas except the electrically small waveguides over the entire frequency range. Overall, the signal sensitivity from 1 to 3 GHz was approximately 2-3 times higher for the three broadband spirals than the waveguides or DCC apertures, and similar at the upper part of the band. Under clinically relevant conditions of probing the tissue load through a 5 mm water bolus maintained at constant 40° C, the spiral antennas all produced comparable accuracy of temperature measurements on the order of 0.15-0.2° C for a uniform temperature load. © Journal of Electromagnetic Waves and Applications. All rights reserved.

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