By James C. Lin
This complete and topical quantity offers a couple of major advances on many fronts during this zone of analysis, fairly emphasizing present and destiny biomedical purposes of electromagnetic fields.
Read Online 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)
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. The complexes that do not resemble the template based on a residue measure are rejected. The residue measure R is given by n R= i=1 (Si,complex − Si,template )2 n (5) where Si is the i th sample of the signal.
For the diagnosis of certain arrhythmias, it is important to recognize the P-wave in the raw data. Therefore, the required sensitivity of a fetal magnetocardiograph is about 100 fT or less. The only instruments that are sensitive enough are magnetometer systems that use as a sensor a SQUID (an acronym for Superconductive QUantum Interference Device). The sensitivity of a SQUID is determined by its intrinsic noise. Since the SQUID noise increases as the √ √ square root of the bandwidth, it is expressed in fT/ Hz.
A typical result is given in Fig. 22 from which it is clear that both contributions tend to counterbalance each other. It turns out that small changes in the geometry of the volume conductor modify the degree in which both the primary and secondary source contribution tend to cancel each other. Hence, the extrema in the magnetic ﬁeld distribution of the different models may be found at different positions. 9. DISCUSSION Fetal MCG can be used to classify arrhythmias. Some information can only be obtained from fetal MCG, such a prolonged QT-interval.
Advances in Electromagnetic Fields in Living Systems: Volume 4 (Advances in Electromagnetic Fields in Living Systems) by James C. Lin