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Antenna Applicator for Microwave Hyperthermia Treatment of Pediatric Brain Cancer

Conference contribution
Authors Hana Dobsicek Trefna
Jonsson Jonathan
Björn Vessman
Joel Wanemark
Emma Woxlin
Albin Hjalmarsson
Leo Adelbäck
Pegah Takook
Johanna Gellermann
Birgitta Lannering
Klas Blomgren
Mikael Persson
Published in 8th European Conference on Antennas and Propagation, EuCAP 2014, The Hague, The Netherlands 6-11 April 2014
ISBN 978-88-907018-4-9
Publication year 2014
Published at Institute of Clinical Sciences, Department of Pediatrics
Language en
Subject categories Medical Equipment Engineering

Abstract

A novel antenna applicator for microwave hyperthermia allowing treatment of deep brain tumors is proposed. The applicator consists of up to 16 antennas placed around the head in a helmet-like set-up and operates at a frequency range of 430-1000~MHz. The self-grounded bow-tie antennas are housed in a molded plastic enclosure with the shape of a truncated cone. The inner space of the enclosure is filled with distilled water. The antennas are attached to a perimetric water bolus with a thickness of 2 cm and aligned with the head shape. The focusing ability of the applicator was investigated on a homogeneous SAM model and on a model of a 13-year old patient containing a spherical tumor of 2 cm radius. Two different tumor positions were investigated: the right frontal lobe and the central brain. The obtained SAR distributions are favorable, although a relatively high level of energy is also absorbed on the surface of the body. This heating is however not expected to cause problems as it can be cooled by blood perfusion and water bolus. Our results show that focused microwave heating in the brain is feasible and warrants further verification on phantoms.

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