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.
(a)
(b)