Read e-book online Advances in Electromagnetic Fields in Living Systems PDF

By James C. Lin

ISBN-10: 0387239979

ISBN-13: 9780387239972

The goal of this fourth quantity within the sequence Advances in Electromagnetic Fields in residing structures remains just like prior volumes: so as to add a few major advances during this zone of analysis to medical literature.

In common, the interplay of electromagnetic fields and waves with organic platforms is frequency-dependent. furthermore, the mechanisms of interplay for fields at low frequencies are very diversified from these at excessive frequencies. whereas major advances are being made on many fronts, a unique emphasis of this quantity is on present and destiny biomedical purposes of electromagnetic fields, ranging in frequency from quasi-static to the optical area. each one bankruptcy contains a accomplished presentation of an issue of present curiosity and turning out to be significance.

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Schneider U. , 2001, The application of fetal magnetocardiography to investigate fetal arrhythmia and congenital heart defects, Prenat. , 21:176– 182. , 1963, Transmission characteristics in fetal electrocardiography, pp. 134–135 In: 16th annual conference on engineering in medicine and biology. P. , 1974, The fetal magnetocardiogram, J. Perinat. Med. 2(3):214– 216. , Hatzmann W. , 2002, Heart rate variability in growth retarded fetuses as determined by fetal magnetocardiography, in: Proc. 13th Int.

5 S/m is a reasonable estimate for the conductivity of the fetus. The average conductivity of the maternal abdomen can also be estimated. 2 is estimated. 17 S/m. 2 S/m. 2 S/m will be a reasonable estimate for the average conductivity of the maternal abdomen. 2. 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.

It turns out that small changes in the geometry of the volume conductor modify the degree in which both the primary and secondary source contribution tend to cancel each other. Hence, the extrema in the magnetic field distribution of the different models may be found at different positions. 9. DISCUSSION Fetal MCG can be used to classify arrhythmias. Some information can only be obtained from fetal MCG, such a prolonged QT-interval. , 2001]. However, the measurement system is still too expensive for obstetric departments in peripheral hospitals.

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

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