Diagnostic Imaging

New PDF release: Advances in Electromagnetic Fields in Living Systems: Volume

Posted On March 14, 2018 at 2:36 pm by / Comments Off on New PDF release: Advances in Electromagnetic Fields in Living Systems: Volume

By James C. Lin

ISBN-10: 0387239979

ISBN-13: 9780387239972

ISBN-10: 0387240241

ISBN-13: 9780387240244

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.

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

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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.

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Advances in Electromagnetic Fields in Living Systems: Volume 4 (Advances in Electromagnetic Fields in Living Systems) by James C. Lin


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