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By James C. Lin

The goal of this fourth quantity within the sequence Advances in Electromagnetic Fields in dwelling platforms remains just like past volumes: so as to add a couple of 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 diversified 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 purposes of electromagnetic fields, ranging in frequency from quasi-static to the optical area. every one bankruptcy comprises a entire presentation of a subject of present curiosity and transforming into value.

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1. Filtering The first step of the signal-processing procedure is the suppression of the baseline wandering. This may be performed by applying the following two band-pass filters. First, a pre-detection finite impulse response (FIR) filter with 50 coefficients and a bandwidth of 10–40 Hz is applied to the fetal MCG signal. This range is chosen because it excludes the power-line frequency of 50 Hz as well as the bandwidth in which the fetal cardiac complex has most of its signal energy. When the power-line frequency is 60 Hz, the bandwidth is of course chosen somewhat differently.

Haueisen, F. Gieszler and R. , VDE Verlag GMBH, Berlin, pp. 633–635. Leeuwen P. , Gr¨onemeyer D. , 1999a , Fetal heart rate variability and complexity in the course of pregnancy, Early Hum. , 54: 259–269. Leeuwen P. , Trowitzsch E. , 1999b , Magnetocardiography in the diagnosis of fetal arrhythmia, Brit. J. Obstet. , 106(11):1200–1208. Fetal Magnetocardiography 39 Leeuwen P. van and Sch¨uszler, 2000, Fetal magnetocardiography in twin pregnancy, Proc. 10th Int. Conf. J. , Springer, New York, 585–588.

8. SIMULATIONS Fetal MCGs are influenced by the current distribution in the volume conductor. This influence can be studied by means of simulations. Simulations can be helpful to determine which features are reflected in the measurements. For instance, an enlarged P-wave may be due to atrial hypertrophy but also due to a large distance between the fetal heart and the point of observation or due to a condition in which the amount of amniotic fluid is very low. Moreover, simulations may help to find the optimal measuring positions.

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