New PDF release: Advances in Electromagnetic Fields in Living Systems: Volume
By James C. Lin
This complete and topical quantity offers a couple of major advances on many fronts during this zone of analysis, relatively emphasizing present and destiny biomedical functions 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 resources for Advances in Electromagnetic Fields in Living Systems: Volume 4 (Advances in Electromagnetic Fields in Living Systems)
6. SIGNAL PROCESSING A signal-processing procedure should be able to remove the noise present in a measured fetal MCG. Signal processing tools are also advisable for the automatic extraction of characteristic features from the fetal MCG, including the onset and offset of the P-wave, QRS-complex, and T-wave, amplitude of these waves, spectral plots and heart rate variability measures. An online processing system that can identify various arrhythmias would also be useful. A signiﬁcant number of algorithms used for fetal MCG extraction are based on techniques developed for fetal ECG.
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. The feedback ﬂux compensates the applied change of ﬂux, ke eping the total ﬂux in the SQUID ring constant.
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. 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.
Advances in Electromagnetic Fields in Living Systems: Volume 4 (Advances in Electromagnetic Fields in Living Systems) by James C. Lin