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Distance of foetal movement measured using the analytical signal derived from non-directional Doppler sound

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Authors
Karlsson, B
Pourcelot, D
Helgason, T
Pourcelot, L
Berson, M
Issue Date
1998-07-01

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Citation
Med Eng Phys. 1998, 20(5):325-31
Abstract
Foetal heart rate (FHR) monitoring using the Doppler shift resulting from the movements of the foetal heart is a standard examination in most obstetrical wards. Other movements also give rise to a low frequency Doppler shift. These signals are incompletely understood. Their characteristics may offer a way for diagnostic exploitation through complementing or replacing time consuming ultrasound observation of foetal movements. It is shown that a wealth of information is contained in these signals which can easily be extracted on line by a standard PC computer using straightforward methods of signal processing. In its amplitude an ultrasonic Doppler signal contains information concerning the size of the reflector in movement and speed as frequency. The displacement of the reflector can also be derived from the phase evolution of a complex Doppler signal. Examples of signals generated by various types of foetal activity are shown and analyzed.
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http://www.sciencedirect.com/science/article/B6T9K-3TX4KCH-2/2/77f11c7d07415cc91074417ae4f542f0
ae974a485f413a2113503eed53cd6c53
10.1016/S1350-4533(98)00033-2
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English Journal Articles (Peer Reviewed)

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