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Ultrasonic diagnosis of molar pregnancies was described as early as 1963 by the same group.
Stuart Campbell's landmark publication in 1968 "An improved method of fetal cephalometry by ultrasound" described the use of both the A- and B-mode scan to measure the fetal biparietal diameter.
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The distance between the 2 cephalic echoes is the BPD.
Although detection of fetal hreartbeat by the A-scan and audio doppler ultrasound (the first "Doptone" was invented in 1965, see section below on doppler) had been variously reported by early groups such as Wang (1964, M-mode from 10 weeks), Kratochwil (1967, vaginal A-scan from 7 weeks), Bang and Holm (1968, A- and M-mode from 10 weeks), it was not until 1972 that Hugh Robinson in Glasgow, basing on improved instrumentation reported a practically useful 100% detection of fetal cardiac action from 7 weeks onwards.