Evaluation of a patch antenna applicator for time reversal hyperthemia.
Int J Hyperthermia
; 26(2): 185-97, 2010.
Article
em En
| MEDLINE
| ID: mdl-20146572
ABSTRACT
PURPOSE:
To describe the design, analysis and evaluation of a new antenna array system for microwave hyperthermia. The proposed antenna array was evaluated by the focusing method based on the time-reversal principle. MATERIALS ANDMETHODS:
Power absorption distributions in a cylindrical homogeneous and inhomogeneous phantom were calculated for the frequency range 500-900 MHz. Two set-ups with 12 and 16 antennas were analysed by comparing the changes in focusing areas enclosed by the 50%, 75% and 90% iso-SAR contours. For a more quantitative evaluation of the results the average power absorption ratio and remaining tissue maximum index were calculated.RESULTS:
The sharpest focusing area in the centre of the phantom, 151 mm(2) (9 x 20 mm) (90% iso-SAR), was obtained by using 16 antennas at frequency 900 MHz. The largest focusing area of 280 mm(2) (13 x 24 mm) (90% iso-SAR) was obtained by using 16 antennas at 500 MHz. The SAR focus was steered in the desired radial direction obtaining a 43 mm(2) 90% iso-SAR focus-width in a semi-three-dimensional neck phantom. The results showed qualitative agreement between three dimensions (3D) and two dimensions (2D) for the performance indicators.CONCLUSIONS:
The conducted study confirms the feasibility of the time-reversal-based focusing methods for microwave hyperthermia. The proposed system shows promise and is suitable for further development in the treatment of head and neck tumours, and extremities application.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Imagens de Fantasmas
/
Desenho de Equipamento
/
Hipertermia Induzida
Tipo de estudo:
Evaluation_studies
/
Qualitative_research
Limite:
Humans
Idioma:
En
Revista:
Int J Hyperthermia
Assunto da revista:
NEOPLASIAS
/
TERAPEUTICA
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Suécia