The author describes a method of identifying and measuring the fetal biparietal diameter ultrasonically, based on an anatomical pattern. This pattern takes the form of an arrow whose components lie in both the sagittal and coronal planes. It is a practical method of obtaining adequate and consistent biparietal measurements in both A/B-scan and real-time modes; in 100 patients studied both ways, the mean difference was 0.0632 mm.
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G. Bryan Young (1980) studied this question.