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Titolo:
A method of SAR measurement using a high-molecular-weight gel phantom: On the correspondence of the surface of the clouded region to the surface of equipower absorption
Autore:
Hoshina, S; Miyakawa, M; Kanai, Y; Kashiwa, T;
Indirizzi:
Niigata Univ, Grad Sch Sci & Technol, Niigata 9502181, Japan Niigata UnivNiigata Japan 9502181 Sci & Technol, Niigata 9502181, Japan Niigata Univ, Fac Engn, Niigata 9502181, Japan Niigata Univ Niigata Japan 9502181 niv, Fac Engn, Niigata 9502181, Japan Niigata Inst Technol, Fac Engn, Kashiwazaki 9451195, Japan Niigata Inst Technol Kashiwazaki Japan 9451195 ashiwazaki 9451195, Japan Kitami Inst Technol, Fac Engn, Kitami, Hokkaido 0908507, Japan Kitami InstTechnol Kitami Hokkaido Japan 0908507 Hokkaido 0908507, Japan
Titolo Testata:
ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS
fascicolo: 3, volume: 85, anno: 2002,
pagine: 51 - 60
SICI:
8756-6621(2002)85:3<51:AMOSMU>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
ABSORBING BOUNDARY-CONDITIONS; EQUATIONS;
Keywords:
phantom; high-molecular-weight gel; SAR distribution; visualization; FD-TD method;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
--discip_EC--
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Hoshina, S Niigata Univ, Grad Sch Sci & Technol, Niigata 9502181, Japan Niigata Univ Niigata Japan 9502181 ol, Niigata 9502181, Japan
Citazione:
S. Hoshina et al., "A method of SAR measurement using a high-molecular-weight gel phantom: On the correspondence of the surface of the clouded region to the surface of equipower absorption", ELEC C JP 1, 85(3), 2002, pp. 51-60

Abstract

As a method for evaluating the electromagnetic exposure of biological bodies, a visualization technique of the absorbed power inside the phantom using high-molecular-weight gel is proposed. Such gel containing a small amountof nonionic surfactants has the property of quickly becoming clouded at a temperature above a certain value. Therefore, it is possible to observe theportion with a temperature increase due to absorption of electromagnetic energy as a clouded region. The surface of the clouded region represents an equitemperature surface indicating the temperature at which the phantom is clouded. Hence, this is basically the equal power absorption surface. However, depending on the influence of the thermal conduction, the shape of the clouded region and the absorption power distribution may not coincide. In this paper, the equality of the clouded region shape and the equal power absorption surface is verified. The measured shape of the clouded region formed inside the phantom and the absorbed power distribution within the phantomderived by the three-dimensional FD-TD (Finite-Difference Time-Domain) method are com-pared. In addition, the influence of thermal conduction on the temperature distribution in the phantom is discussed. it is confirmed that the clouded shape caused by electromagnetic wave exposure and the computed equal power absorption surface agree well if the electromagnetic wave illumination time is less than about I minute. The validity of this method measuring the amount of electromagnetic wave exposure from the clouded shape is confirmed. (C) 2001 Scripta Technica.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/01/20 alle ore 15:52:37