@inproceedings{oai:repo.qst.go.jp:00053886,
 author = {Kikuchi, Satoru and Saito, Kazuyuki and Ito, Koichi and Ikehira, Hiroo and et.al and 池平 博夫},
 book = {Proceedings of the 2007 International Symposium on Antennas and Propagation : August 20-24, 2007 Niigata, Japan},
 month = {},
 note = {Magnetic resonance imaging (MRI) is one of effective diagnostic modalities without using ionization radiation. The MRI system is composed of several units including radio frequency (RF) technologies,and RF coil is one of the important units for imaging. The RF coil operates as an antenna, which "radiates the RF pulses to the body" and "receives the nuclear magnetic resonance (NMR)signals emitted from the body". Here, according to shape of the RF pulses, various types of images inside the human body can be obtained. Figure 1 shows the one type of RF pulses. In general, although widths of pulses are narrow, their amplitudes are not so low. Therefore, it is necessary to assess the specific absorption rate (SAR) in the human body due to the radiated RF pulse from the RF coils. Until now, the estimation of SAR in the human head has been studied during MR imaging [2], [3]. However, in recent years, MR imaging is used not only for the head but also for other parts of the body. Especially, in this study, the SAR distributions in the abdomen of a pregnant woman are investigated. In general, an ultrasound diagnostic system is used for the medical examination of the pregnant woman. However, the MR imaging is sometimes chosen for the medical reasons. Therefore, it is important to investigate the SAR in the pregnant woman and her fetus [4], [5]. Concretely, we assumed the imaging of a pregnant woman in early period and in her 28th gestational week. In this study, the finite-difference time-domain (FDTD) calculations are employed and two types of realistic woman models as previously developed are adapted for the SAR calculations. Moreover, various position of the RF coil to the SAR inside the fetus is investigated.},
 pages = {434--437},
 publisher = {Institute of Electronics, Information and Communication Engineers},
 title = {SAR Calculations in Various Parts of Pregnant Woman during MR Imaging},
 year = {2007}
}