Page 21 - SONO 260 The Fetal Head and Brain

Fetal Head Measurements Head Circumference
The head circumference (HC) measurement can be taken at the same time of gestation and at the same level of the cranium as the biparietal diameter measurement.
— Thus, the HC is obtained in the axial plane at the level of the cavum septum pellucidum, thalamus, falx cerebri, and a measurement around the entire cranium is obtained.
— This is the same level as the third ventricle, which may be seen between the two lobes of the thalamus.
— The cranial bones must be symmetric on both sides of the head.