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This paper assess the intra- and interobserver variability of fetal biometry measurements throughout pregnancy. Authors concluded that although intra- and interobserver variability increases with advancing gestation when expressed in milimeters, both are constant as a percentage of the fetal dimensions or when reported as a Z-score. Thus, measurement variability should be considered when interpreting fetal growth rates.
Useful study. This paper www.sofka.com/AFHB.html contains inter-observer variability in fetal head and brain measurements and compares the statistics to the fully automated system. The measurements are obtained from 3D scans.