Diagnostic Imaging

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

By James C. Lin

This accomplished and topical quantity offers a few major advances on many fronts during this zone of analysis, really emphasizing present and destiny biomedical functions 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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This change in field is of the order of the fetal MCG and should be avoided. However, it is impossible to avoid vibrations over 10−8 radian, therefore, a pickup coil is used that forms a gradiometer. 2. Usually, the measurements take place in a magnetically shielded room and the recorded signals are fed to a computer system located outside the shielded room. The measurement setup is pictured in Fig. 10. 2. Electronic Circuit A SQUID can be considered as a flux-to-voltage transducer with a sine-like flux-voltage characteristic.

1997]. 2 times the median amplitude. A template of the PQRST-complex is created by averaging the individual PQRST-complexes. The template is then modified by flattening the baseline, which is done by fitting a linear function in the first and last 15 ms of the interval in which the PQRST-complex is located. The position of the Fetal Magnetocardiography 25 R-peak is then corrected by making a cross correlation of each complex with the template. After these corrections, baseline corrections are made in each complex.

1 Hz and of about 1000 at 100 Hz. 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.

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