By James C. Lin

This accomplished and topical quantity offers a few major advances on many fronts during this region of analysis, relatively emphasizing present and destiny biomedical purposes of electromagnetic fields.

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Extra info for Advances in Electromagnetic Fields in Living Systems: Volume 4 (Advances in Electromagnetic Fields in Living Systems)

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A) B) 0 10 20 30 40 50 60 Time [sec] Figure 13. An example of the filtering procedure. A) The raw signal. B) The filtered signal. be discussed that have proved to be adequate for measurements carried out inside a shielded room. 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.

In fetuses, the ventricular wall is supposed to be homogeneous. 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.

Electronic Circuit A SQUID can be considered as a flux-to-voltage transducer with a sine-like flux-voltage characteristic. 07 × 10−15 Wb. An example of the flux-voltage characteristic is given in Fig. 11A. In order to linearize the relationship between the measured voltage and the applied magnetic flux, a zero-detector is commonly used (a so-called flux-locked loop). In Fig. 11B, a simplified scheme of a flux-locked loop is depicted. A change of flux in the SQUID ring causes a change in the output voltage that is amplified, filtered and converted into a flux in the feedback circuit consisting of a resistor and inductance.

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