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Diagnostic ultrasound ( PDFDrive )

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CHAPTER 42 Fetal Measurements 1459

A

B

C

D

FIG. 42.12 Umbilical Artery Doppler. (A) Color and spectral Doppler of umbilical artery demonstrating normal low with systolic to diastolic

ratio (S/D) normal at 2.13. (B) Sonogram of term fetus showing Doppler gate on umbilical artery and spectral waveform with elevated S/D of 4.15

due to diminished diastolic low. (C) Sonogram showing Doppler gate on umbilical artery and spectral waveform below demonstrating absent

end-diastolic low (arrows). (D) Color and spectral Doppler demonstrating reversed end-diastolic low (arrows).

A

B

FIG. 42.13 Ductus Venosus Doppler. (A) Color and spectral Doppler of the ductus venosus demonstrating normal low, toward the heart

throughout the cardiac cycle. (B) Color and spectral Doppler of the ductus venosus demonstrating reversed low (arrows) during part of the cardiac

cycle, an abnormal inding.

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