Journal of Medical Physics
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TECHNICAL NOTE
Year : 2018  |  Volume : 43  |  Issue : 2  |  Page : 141-145

Documentation of a new intracavitary applicator for transrectal hyperthermia designed for prostate cancer cases: A phantom study


1 Department of Electrical and Computer Engineering, National Technical University of Athens; 2nd Department of Radiology, Radiotherapy Unit, Medical School, National and Kapodistrian University of Athens, Athens, Greece
2 1st Department of Radiology, Medical Physics Unit, Medical School, National and Kapodistrian University of Athens, Athens, Greece
3 Department of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece

Correspondence Address:
Dr. Aggeliki Nikolakopoulou
1st Department of Radiology, Aretaieion Hospital, Vas Sofias 76 Ave., Athens 11528
Greece
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jmp.JMP_67_17

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Concerning clinical trials, intracavitary hyperthermia has already shown antitumor activity and has a potential role in the treatment of prostate cancer. The aim of this study was to document a new intracavitary applicator operating at 433 MHz, designed for transrectal hyperthermia, as well as to assess the specific absorption rate (SAR) distributions in terms of temperature measurements in a soft-tissue phantom. The microwave applicator consists of a dipole-type λ/2, a reflector, and the cooling system. The applicator was placed into a soft-tissue gel-phantom box that was mimicking the dielectric properties of the normal tissue. A calibrated thermometer was implanted inside the phantom at specific locations, to calculate temperature distributions. The maximum value of the SAR was 108 W/kg on the surface's central area at the footprint of the antenna, while the penetration depth was at around 3 cm. Our experimental measurements confirmed the role of the reflector concerning the directivity in a certain area and non icotropic, by means of protecting normal tissues around the prostate. The SAR experimental measurements showed that our applicator might be used effectively as a treatment device for prostate cancer, demonstrating a clear advantage over other similar transrectal devices.


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