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  • Title: [The characterization of semirigid coaxial antennae for interstitial and endocavitary microwave hyperthermia].
    Author: Erb J, Klautke G, Seegenschmiedt HM, Engelbrecht R, Schaller G, Sauer R.
    Journal: Strahlenther Onkol; 1994 Nov; 170(11):654-64. PubMed ID: 7974181.
    Abstract:
    PURPOSE: The increased dissemination of interstitial hyperthermia techniques requires suitable action in quality assurance for the used applicators. This work presents physical-technical methods for complete characterisation of interstitial and endocavitary coaxial antennas used for microwave hyperthermia. METHODS: After a short introduction about the antennas' physical principle 2 fundamental experiments for acquisition of specific absorption rate (SAR) are described: There are the thermometric method, especially the power pulse technique, using a static solid state phantom and the direct measurement of the amplitude square of emitted electric field using miniaturized E-field probes in a fluid phantom. Principal problems occurring during E-field measurements in the near field zone of insulated antennas in media (phantom fluid) are discussed in detail. RESULTS: Characteristic relative SAR profiles were found for each tested applicator design. The profiles were described using the following parameters: depths of SAR maximum, effective heating lengths and lengths of the dead end of the antennas relative to the 50%-iso-SAR-surface. Antenna designs for endocavitary and interstitial purposes were measured at variable insertion depths. The changing SAR-patterns were discussed regarding the found measurement data. Additionally measurements of parallel and inclined antenna arrays consisting of 4 interstitial applicators are described. CONCLUSION: The final discussion give future perspectives to forthcoming developments for interstitial and endocavitary microwave hyperthermia.
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