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- Title
Frontomaxillary facial angle at 11 + 0 to 13 + 6 weeks: effect of plane of acquisition.
- Authors
Plansencia, W.; Dagklis, T.; Pachoumi, C.; Kolitsi, E.; Nicolaides, K.H.
- Abstract
Objective To determine the range of positions of the fetal head in which a three-dimensional (3D) volume is acquired for subsequent successful assessment of the frontomaxillary facial (FMF) angle. Method We obtained 3D volumes of the fetal head at 11 + 0 to 13 + 6 weeks. The volumes were acquired with the head in different positions and reconstructed to obtain a mid-sagittal section and demonstrate the maxilla, palate and frontal bone, which constitute the landmarks for the assessment of the FMF angle. Results In the reconstructed mid-sagittal sections, it was possible to demonstrate the landmarks that define the FMF angle in most of the cases when the 3D volume acquisition plane was: (a) mid-sagittal, with the angle between the face of the transducer and the direction of the fetal nose being about 0-99°, 150-199° and 330-359°; (b) transverse at the level of the biparietal diameter when the angle between the transducer and the midline echo of the brain was 0-29°; and (c) oblique around the crown-rump axis when the angle from the mid-sagittal plane was 0-49°. However, the measurement of the FMF angle was artificially increased when in the mid-sagittal plane the angle was 40-99° and 150-199°. Conclusion Successful assessment of the FMF angle by 3D ultrasound is dependent on the plane and angle of the volume acquisition.
- Subjects
MAXILLA; FETUS; BRAIN; TRANSDUCERS; ULTRASONIC imaging
- Publication
Ultrasound in Obstetrics & Gynecology, 2007, Vol 29, Issue 6, p660
- ISSN
0960-7692
- Publication type
Article
- DOI
10.1002/uog.4033