遠方界ばく露による妊婦と子供のボクセルSARの外れ値が全身平均SARに及ぼす影響

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2013/01/01

タイトル(英語): Statistical Outliers in Voxel SARs and their Effect of Whole-Body Average SARs in Pregnant Woman and Child for Far-Field Exposure

著者名: 浅山　遼太（名古屋工業大学大学院），王　建青（名古屋工業大学大学院），藤原　修（名古屋工業大学大学院），長岡　智明（(独) 情報通信研究機構），渡邊　聡一（(独) 情報通信研究機構）

著者名(英語): Ryota Asayama (Graduate School of Engineering, Nagoya Institute of Technology), Jianqing Wang (Graduate School of Engineering, Nagoya Institute of Technology), Osamu Fujiwara (Graduate School of Engineering, Nagoya Institute of Technology), Tomoaki Nagaoka (National Institute of Information and Communications Technology), Soichi Watanabe (National Institute of Information and Communications Technology)

キーワード: 遠方界ばく露，妊娠女性，3歳児，ボクセルSAR，統計的外れ値，全身平均SAR　　far-field exposure，pregnant woman，3-years child，voxel SAR，statistical outliers，whole-body average SARs

要約(英語): The WHO (World Health Organization) recommended the necessity of electromagnetic (EM) dosimetry evaluation for pregnant women with fetus and children as one of the most primary research subjects in 2006, which has promoted the studies on whole-body-average specific absorption rates (WBA-SARs) in various kinds of numerical pregnant woman and child models with respect to safety limits of WBA-SARs. For the present safety limits, however, they are being determined in view of the behavior destruction of health adult animals for radio-frequency EM exposure and EM absorption characteristics at resonant frequencies, which are not based on experiments for pregnant and young animals. In this paper, we calculated the voxel SARs and WBA-SARs in anatomical detailed models developed for a pregnant woman and a 3-years child at their resonant frequencies. The histograms and cumulative relative distributions of voxel SARs were also derived to determine the statistical outlier in voxel SARs for pregnant woman and 3-years child models. As a result, we found that the mean voxel SARs agree with the WBA-SARs, and that the medians of voxel SARs in the pregnant woman and 3-years child models are 47% and 55% of their means, respectively, while their peak voxel SARs are 70 times larger than both of the means. This suggests a possibility that the FDTD calculated WBA-SARs could be overestimated due to the existence of statistical outliers. It was also found that although the total number ratio of voxel SARs for the outliers is 0.36% for the pregnant woman model and 0.34% for the 3-years child model, WBA-SARs except for these outliers are less than those in the pregnant woman and 3-years child models by 6.8% and 5.7%, respectively.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.133 No.1 （2013）

本誌掲載ページ: 2023/07/12 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/133/1/133_7/_article/-char/ja/