Toshiyuki Hata

Toshiyuki Hata, MD, PhD


Present Position

Professor and Chairman

Department of Perinatology and Gynecology

Kagawa University Graduate School of Medicine



Japan Society of Obstetrics and Gynecology – Board Member (2005 to 2009)

Japan Society of Maternal and Fetal Medicine – President (2016-2017)

American Institute of Ultrasound in Medicine – Fellow

International Society of Ultrasound in Obstetrics and Gynecology – Fellow

Honorary Member of Philippine Society of Ultrasound in Clinical Medicine Inc.

Honorary Member of Romanian Society for Ultrasound in Obstetrics and Gynecology

Reginal Director (Asia and Oceania) of The Ian Donald Inter-University School of Medical Ultrasound



Journal of Medical Ultrasonics (Scientific Advisory Board)

Neurosonology (Advisory Editorial Board)

Donald School of Ultrasound in Obstetrics and Gynecology (Co-Editor)



Member of Ultrasound Committee, AOFOG

(2012/2013, 2014/2015)


Book & Journal

Current Topics on Fetal 3D/4D Ultrasound, Bentham Science Publishers, 2011 (Editor)

Donald School Journal of Ultrasound in Obstetrics and Gynecology 2014 Vol. 8 No. 4 (Guest Editor)

Donald School Journal of Ultrasound in Obstetrics and Gynecology 2015 Vol. 9 No. 4 (Editor)


Toshiyuki Hata, MD, PhD

Professor and Chairman, Department of Perinatology and Gynecology, Kagawa University Graduate School of Medicine, Kagawa, Japan

Main activities in OB/GYN ultrasound study

In 1992, we reported the use of ophthalmic artery velocimetry in pregnant women for the first time in the world (Lancet 1992;340:182-3). In this work, we demonstrated that the vascular resistance of the ophthalmic artery is significantly reduced in women with pregnancy-induced hypertension (PIH). Subsequently, we demonstrated that there is a difference in the circulation of the maternal ophthalmic artery between mild and severe PIH cases (Am J Obstet Gynecol 1997;177:174-8). Furthermore, we reported that vascular resistance is reduced in pregnancies associated with small-for-gestational-age fetuses (Ultrasound Obstet Gynecol 1998;11:328-31), as well as in pregnant women with diabetes (Hum Reprod 2000;15:222-3).

We performed intrauterine sonography with a 20-MHz high-frequency miniature (2.4-mm diameter) ultrasound transducer to observe embryos in the early stages of pregnancy (Am J Obstet Gynecol 1995;173:1770-4; Hum Reprod6;11:2758-61, 1997;12:1873-6, 1997;12:2286-91). We also demonstrated that intrauterine sonography can be used effectively to observe the development of the embryonic brain and central nervous system (Hum Reprod 2000;15:1407-12; Ultrasound Obstet Gynecol 2009;34:47-51).

We used 3D/4D ultrasound to monitor fetal growth and diagnose fetal abnormalities (Hum Reprod 1997;12:1800-4, 1998;13:740-3, 2000;15:2438-42; Obstet Gynecol 1998;91:218-23; Ultrasound Obstet Gynecol 1998;12:235-9, 2002;19:471-4; Arch Gynecol Obstet 2012;286:1431-5; Ultrasound Med Biol 2012;38:396-401), as well as in the evaluation of the normal and abnormal placenta (Placenta 2009;30:391-7, 2010;32:105-15, 2016;45:32-6; Ultrasound Obstet Gynecol doi: 10.1002/uog.18837).