The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Este artigo apresenta a dosimetria eletromagnética computacional dentro de modelos anatômicos de gestantes expostas a ondas eletromagnéticas durante ressonância magnética. Os dois tipos de modelos de gestante correspondentes ao início da gestação e 26 semanas de gestação foram utilizados para este estudo. A taxa de absorção específica (SAR) dentro e ao redor de um feto foi calculada por ondas eletromagnéticas irradiadas de bobinas de gaiola de passagem alta e passa baixa. Os resultados dos cálculos numéricos mostraram que a região de alta SAR é observada no corpo nas proximidades das lacunas da bobina e está relacionada ao campo elétrico concentrado nas lacunas do corpo humano, como axilas e coxas. Além disso, confirmou que a SAR no feto é inferior ao limite da Comissão Electrotécnica Internacional de 10 W/kg, quando as SAR médias do corpo inteiro são de 2 W/kg e 4 W/kg, que são o modo de funcionamento normal e o primeiro nível modo de operação controlado, respectivamente.
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Satoru KIKUCHI, Kazuyuki SAITO, Masaharu TAKAHASHI, Koichi ITO, Hiroo IKEHIRA, "SAR Computation inside Fetus by RF Coil during MR Imaging Employing Realistic Numerical Pregnant Woman Model" in IEICE TRANSACTIONS on Communications,
vol. E92-B, no. 2, pp. 431-439, February 2009, doi: 10.1587/transcom.E92.B.431.
Abstract: This paper presents the computational electromagnetic dosimetry inside an anatomically based pregnant woman models exposed to electromagnetic wave during magnetic resonance imaging. The two types of pregnant woman models corresponding to early gestation and 26 weeks gestation were used for this study. The specific absorption rate (SAR) in and around a fetus were calculated by radiated electromagnetic wave from highpass and lowpass birdcage coil. Numerical calculation results showed that high SAR region is observed at the body in the vicinity of gaps of the coil, and is related to concentrated electric field in the gaps of human body such as armpit and thigh. Moreover, it has confirmed that the SAR in the fetus is less than International Electrotechnical Commission limit of 10 W/kg, when whole-body average SARs are 2 W/kg and 4 W/kg, which are the normal operating mode and first level controlled operating mode, respectively.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.431/_p
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@ARTICLE{e92-b_2_431,
author={Satoru KIKUCHI, Kazuyuki SAITO, Masaharu TAKAHASHI, Koichi ITO, Hiroo IKEHIRA, },
journal={IEICE TRANSACTIONS on Communications},
title={SAR Computation inside Fetus by RF Coil during MR Imaging Employing Realistic Numerical Pregnant Woman Model},
year={2009},
volume={E92-B},
number={2},
pages={431-439},
abstract={This paper presents the computational electromagnetic dosimetry inside an anatomically based pregnant woman models exposed to electromagnetic wave during magnetic resonance imaging. The two types of pregnant woman models corresponding to early gestation and 26 weeks gestation were used for this study. The specific absorption rate (SAR) in and around a fetus were calculated by radiated electromagnetic wave from highpass and lowpass birdcage coil. Numerical calculation results showed that high SAR region is observed at the body in the vicinity of gaps of the coil, and is related to concentrated electric field in the gaps of human body such as armpit and thigh. Moreover, it has confirmed that the SAR in the fetus is less than International Electrotechnical Commission limit of 10 W/kg, when whole-body average SARs are 2 W/kg and 4 W/kg, which are the normal operating mode and first level controlled operating mode, respectively.},
keywords={},
doi={10.1587/transcom.E92.B.431},
ISSN={1745-1345},
month={February},}
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TY - JOUR
TI - SAR Computation inside Fetus by RF Coil during MR Imaging Employing Realistic Numerical Pregnant Woman Model
T2 - IEICE TRANSACTIONS on Communications
SP - 431
EP - 439
AU - Satoru KIKUCHI
AU - Kazuyuki SAITO
AU - Masaharu TAKAHASHI
AU - Koichi ITO
AU - Hiroo IKEHIRA
PY - 2009
DO - 10.1587/transcom.E92.B.431
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 2
JA - IEICE TRANSACTIONS on Communications
Y1 - February 2009
AB - This paper presents the computational electromagnetic dosimetry inside an anatomically based pregnant woman models exposed to electromagnetic wave during magnetic resonance imaging. The two types of pregnant woman models corresponding to early gestation and 26 weeks gestation were used for this study. The specific absorption rate (SAR) in and around a fetus were calculated by radiated electromagnetic wave from highpass and lowpass birdcage coil. Numerical calculation results showed that high SAR region is observed at the body in the vicinity of gaps of the coil, and is related to concentrated electric field in the gaps of human body such as armpit and thigh. Moreover, it has confirmed that the SAR in the fetus is less than International Electrotechnical Commission limit of 10 W/kg, when whole-body average SARs are 2 W/kg and 4 W/kg, which are the normal operating mode and first level controlled operating mode, respectively.
ER -