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Advances in Electromagnetic Fields in Living Systems by James C. Lin

By James C. Lin

The target of this fourth quantity within the sequence Advances in Electromagnetic Fields in dwelling platforms remains almost like prior volumes: so as to add a few major advances during this zone of study to clinical literature.

In common, the interplay of electromagnetic fields and waves with organic structures is frequency-dependent. additionally, the mechanisms of interplay for fields at low frequencies are very varied from these at excessive frequencies. whereas major advances are being made on many fronts, a distinct emphasis of this quantity is on present and destiny biomedical functions of electromagnetic fields, ranging in frequency from quasi-static to the optical area. every one bankruptcy involves a finished presentation of a subject matter of present curiosity and growing to be value.

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Geometry of the Volume Conductor The fetoabdominal anatomy is depicted in Fig. 15. The volume conductor changes throughout gestation, its electrical properties and geometry depend on gestational age. Since we are interested in the influence of the volume conductor on the fetal MCG, only the gestational period from the 20th week onward needs to be considered. In order to be able to use the boundary element method to study the influence of the volume conductor on fetal MCG, the volume conductor has to be described by compartments with a homogeneous conductivity.

The depolarization of the heart can be described by a current dipole layer that is moving as the activity spreads through the heart. At some distance, this current dipole layer can be approximated by a single moving current dipole or by one at a fixed position that rotates 26 Maria J. Peters et al. during the cardiac cycle. The latter model is based on the fact that the dimension of the fetal heart is small in comparison to the distance between the dipole and the point of observation. The volume conductor model is very complicated.

Boston. , 2001, The reliability of the fetal magnetocardiogram, PhD thesis, University of Twente, The Netherlands. G. J, 2002, The influence of fetoabdomenal tissues on fetal ECGs and MCGs, Arch. Physiol. , 110 (3): 165–176. P. , 1999a , The influence of the vernix caseosa on foetal magnetocardiograms, in: Recent Advances in Biomagnetism, T. Yoshimoto, M. Kotani, S. Kuriki, H. Karibe and N. , Tohoku University Press, Sendai, pp. 1070–1073. 40 Maria J. Peters et al. J. , 2001a , Extracting reliable data from the fetal MCG, in: Biomag2000 Proceedings 12th Int Conf on Biomagnetism, pp.

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