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. Author manuscript; available in PMC: 2010 Feb 1.
Published in final edited form as: J Am Soc Echocardiogr. 2009 Jan 8;22(2):170–176. doi: 10.1016/j.echo.2008.11.028

Figure 2.

Figure 2

a) Example of the measured cyclic variation of backscatter expressed in dB for 6 heart cycles from the left-ventricular free wall of one of the fetuses with the end-diastolic frames indicated by “ED”. b) Corresponding composite cyclic variation curve. The average systolic and diastolic intervals are indicated.