AIUM Takes Steps to Improve the Quality of Ultrasound Imaging in Obstetrics and Gynecology (image) Elsevier Share Print E-Mail Caption Biparietal diameter along with the list of criteria for competency. A teaching example from the curriculum that describes how an important measurement of a developing fetus is made. Credit American Journal of Obstetrics & Gynecology Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.