Assoc. Prof. Tuangsit Wataganara from the Maternal-Fetal Medicine Unit, Department of Obstetrics and Gynaecology, Faculty of Medicine Siriraj Hospital, Mahidol University, attended and delivered a research presentation on the topic “Longitudinal study of uterine artery Doppler indices throughout gestation in women with and without previous Caesarean delivery” at the “International Society of Ultrasound in Obstetrics and Gynecology (ISUOG)’s 31st Virtual World Congress on Ultrasound in Obstetrics and Gynecology 2021″. This congress was held as an online platform between October 15th-17th, 2021.