Learning curve in measurement of fetal frontomaxillary facial angle at 11-13 weeks of gestation

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
Xin YangT K Lau

Abstract

To determine the number of ultrasound examinations required to train sonographers to accurately measure the fetal frontomaxillary facial (FMF) angle at 11-13 weeks of gestation. Eight sonographers accredited for nuchal translucency thickness (NT) measurement (and with different levels of experience) were trained to measure the fetal FMF angle using specially acquired three-dimensional (3D) volumes. Training was provided in cycles, and each cycle consisted of a training period on 20 randomly selected cases followed by an examination using 10 randomly selected cases. During training, the sonographer was informed of the true FMF angle value after each FMF angle measurement on a case-by-case basis. During examination, the difference between the measured and the true values of the FMF angle (i.e. the delta angle) was calculated. A measurement was considered accurate if the delta angle was less than 5 degrees . The sonographer was considered to be competent and the training finished if all 10 examination cases satisfied this criterion. Otherwise, the sonographer would undergo further cycles of training-examination, until he/she became competent. The number of training cases required for a sonographer to become competent was 40 for tw...Continue Reading

References

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Citations

Nov 30, 2013·Obstetrics and Gynecology International·Jennifer AlphonseAndrew McLennan
Jul 29, 2015·Journal of Obstetrics and Gynaecology : the Journal of the Institute of Obstetrics and Gynaecology·S PranpanusN Pruksanusak
Oct 6, 2010·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·R Cruz-MartinezE Gratacos
Feb 11, 2015·Prenatal Diagnosis·N V HermannC Joergensen
Jan 30, 2013·The Journal of Maternal-fetal & Neonatal Medicine : the Official Journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians·Ana Paula Nascimento PanigassiDavid Baptista da Silva Pares
May 28, 2010·The Journal of Maternal-fetal & Neonatal Medicine : the Official Journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians·Xiao Hong YangTze Kin Lau

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