Three-dimensional ultrasound imaging and measurement of nasal bone length, prenasal thickness and frontomaxillary facial angle in normal second- and third-trimester fetuses

Ultrasound in Obstetrics & Gynecology, 04/26/2012

Nasal bone length (NBL) and prenasal thickness (PT) are easily measured using 3D ultrasound whereas frontomaxillary facial (FMF) angle measurement is more challenging. When it is measured in the exact mid–sagittal plane and care is taken to exclude the frontal bone, measurements of the NBL are systematically smaller than those in previous 2D ultrasound–based publications.

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