Thoracic circumference measurement from Thompson's paper in 1965:   Thompson HE. Studies of fetal growth by ulttrasound. In: Grossman GC, Holmes JH, Joyner C, Purnell EW, eds. Diagnostic Ultrasound: Proceedings of the First International Conference, University of Pittsburgh, 1965. New York: Plenum Press, 196:416.

Weight estimation basing on a combination of biparietal diameter and thoracic circumference in the same paper.

Back to History of Ultrasound in Obstetrics and Gynecology.