The Australasian Society for Ultrasound in Medicine, The Royal Australian College of Obstetricians and Gynaecologists and the Royal Australasian College of Radiologists have produced jointly the accompanying document on the 18-20 week obstetrical scan. It is an important document not only for the sonologists and sonographers but also for clinicians who request ultrasound examinations for pregnant women, so that they may have a better idea of what the examination should cover and its limitations.
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O'Brien et al. (1993) studied this question.