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Diagnostic ultrasound ( PDFDrive )

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1060 PART IV Obstetric and Fetal Sonography

A

B

FIG. 30.14 Normal 12-Week Gestation. (A) Surface rendering image from three-dimensional TVS shows the embryo within the amnion.

(B) Two-dimensional TVS shows the amnion (arrow) approaching, but not fused with, the chorionic sac.

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B

C

D

FIG. 30.15 Normal Embryo With Early Cardiac Activity. (A) Image shows 5-week 6-day embryo (calipers) adjacent to the yolk sac. (B)

M-mode ultrasound shows a heart rate of 96 beats/min. (C) Two days later, the embryonic pole (calipers) has grown and (D) the heart rate has

increased to 111 beats/min. See also Video 30.1.

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