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. Author manuscript; available in PMC: 2015 Feb 1.
Published in final edited form as: Ultrasound Med Biol. 2013 Dec 15;40(2):351–360. doi: 10.1016/j.ultrasmedbio.2013.09.026

Figure 6.

Figure 6

Doppler velocities and resistance index (RI) from gestational day 12 to gestational day 18 of the common carotid artery PSV, peak systolic velocity (1a); EDV, end diastolic velocity (1b); RI, resistance index (1c) and middle cerebral artery PSV, peak systolic velocity (2a); EDV, end diastolic velocity (2b); RI, resistance index (2c). The solid line represents the best fitting mean determined using a generalized linear model, whereas dashed lines represent the 95% confidence limits of the mean.