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Paper Abstract and Keywords
Presentation 2018-10-18 11:35
Temperature Elevation for Brief Exposure in GHz Region
Sachiko Kodera, Akimasa Hirata (NIT)
Abstract (in Japanese) (See Japanese page) 
(in English) In international guideline/standard for protection from radio-frequency electromagnetic fields, the specific absorption rate (SAR) averaged over 10 g of tissue is used as a physical quantity to prevent local temperature elevation. The averaging time of SAR is set to 6 min for local exposure. The ICNIRP public consultation document introduced a new physical quantity, transmitted power density (TPD), as the basic restriction above 6 GHz. In addition, the limit for the specific absorption (SA) and transmitted energy density (TED) were set to avoid heating for brief exposures (shorter than the averaging time of 6 min). However, to our knowledge, no study evaluated the temperature elevation for single/multiple pulses whose energy satisfies that for 6-min continuous waves. This study computed the temperature elevation for brief pulse exposures based on bioheat computation. We first confirmed that the peak temperature elevation exceeds the steady-state temperature. We then proposed the limit of SA from the regression curve depending on the duration of brief-pulse(s) exposure. The time course of temperature elevation in the multi-layer cube model was computed for typical scenarios of multiple pulses exposures. The SA and TED based on the regression curve can be used as a metric to prevent excess temperature elevation for different brief exposure scenario.
Keyword (in Japanese) (See Japanese page) 
(in English) Bioheat transfer equation / Temperature elevation / Brief exposure / / / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 249, EST2018-59, pp. 17-21, Oct. 2018.
Paper # EST2018-59 
Date of Issue 2018-10-11 (EMCJ, MW, EST) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Conference Date 2018-10-18 - 2018-10-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Hachinohe Chamber of Commerce and Industry(Hachinohe city, Aomori) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Simulation techniques, EMC, Microwave, Electromagnetic field simulation, etc. 
Paper Information
Registration To EST 
Conference Code 2018-10-EST-MW-EMCJ-EMC 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Temperature Elevation for Brief Exposure in GHz Region 
Sub Title (in English)  
Keyword(1) Bioheat transfer equation  
Keyword(2) Temperature elevation  
Keyword(3) Brief exposure  
1st Author's Name Sachiko Kodera  
1st Author's Affiliation Nagoya Institute of Technology (NIT)
2nd Author's Name Akimasa Hirata  
2nd Author's Affiliation Nagoya Institute of Technology (NIT)
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Date Time 2018-10-18 11:35:00 
Presentation Time 25 
Registration for EST 
Paper # IEICE-EMCJ2018-37,IEICE-MW2018-73,IEICE-EST2018-59 
Volume (vol) IEICE-118 
Number (no) no.247(EMCJ), no.248(MW), no.249(EST) 
Page pp.17-21 
#Pages IEICE-5 
Date of Issue IEICE-EMCJ-2018-10-11,IEICE-MW-2018-10-11,IEICE-EST-2018-10-11 

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