By James C. Lin
This entire and topical quantity offers a few major advances on many fronts during this zone of analysis, really 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)
Three of these modiﬁcations are: 1) Cooling the resonant transformer stage. This results in an ampliﬁcation of the output voltage of the SQUID by about a factor of ten; thus increasing VOˆ in Eq. (1) by the same factor. To do so, the ﬂux in the SQUID ring is modulated via a feedback circuit by a frequency in the range of 100−500 kHz. Apart from increasing VOˆ , this modiﬁcation provides another advantage. By means of the modulation, the spectral content of the signal shifts towards higher frequencies, thus escaping from the low-1/f noise of the preampliﬁer.
Peters et al. A) 0 1000 2000 3000 4000 5000 Time [ms] B) 0 1000 2000 3000 4000 5000 Time [ms] Figure 14. An example of application of ICA. A) Raw fMCG data. The maternal MCG and fetal MCG are present in all channels. B) Output of ICA. The maternal and fetal MCG are separated. The ﬁrst channel shows the fMCG signal only. The last channel shows the maternal MCG. The middle channel is a combination of fMCG, mMCG and white noise. The R-peaks in the fetal MCG can be detected using the following method.
2002; Bachir and Dunajski, 2002]. Such systems will lead to better fetal monitoring and health care. , Kotini A. , 2001, Fetal heart rate patterns in normal and ritrodine-treated pregnancies, detected by magnetocardiography, J. Matern. , 10(5):350–354. E. , 2001, Reference values for time intervals between atrial and ventricular contractions of the fetal heart measured by two Doppler techniques, Am. J. of Cardiol, 88(12):1433–1436. Bachir W. , 2002, Flux transformer for fetal magnetocardiography in an unshielded environment, Proc.