Biparietal diameter (BPD): Beginning with the 12th gestational week, measuring the BPD becomes feasible and more accurate than measuring the CRL. At this time, the choroid plexus (104) appears bilaterally and is seen as an echogenic structure. To make the measurement reproducible and accurate, the same reference plane (Fig. 65.1) should be selected, with visualization of the entire circumference of the oval skull (105). It is important to select an orientation paral lel to the midline echo of the falx (106), which is interrupted in the anterior third by the cavum septi pellucidi. Cerebellum or orbits should not be in the imaging plane because the diameter would be measured too far inferiorly. In the same imaging plane, the occipitofrontal diameter (OFD) and the head circumference (HC) can be measured as well. The respective normal values can be found at the end of the book.
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