Research Article
Relationship between Twin-to-Twin Selective Intrauterine Growth Restriction with sFas/sFasL Level of Umbilical Cord Blood Using Doppler Ultrasound Fetal Heart Rhythm Detection Algorithm
Figure 2
Ultrasound Doppler fetal heart sound signals. (a) Ultrasound Doppler fetal heart rate signals; (b) two-dimensional time-frequency contour graph of fetal heart rate.
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