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.
Read or Download Advances in Electromagnetic Fields in Living Systems: Volume 4 (Advances in Electromagnetic Fields in Living Systems) PDF
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Extra info for Advances in Electromagnetic Fields in Living Systems: Volume 4 (Advances in Electromagnetic Fields in Living Systems)
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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