Question

Which of the following instrument makes use of the Doppler shift principle?

(a) Abdominal Foetal Electrocardiogram

(b) Foetal Phonocardiogram

(c) Foetus blood flow detector

(d) Foetal ECG with scalp electrode

Answer 1

The correct choice is (c) Foetus blood flow detector

Best explanation: An important clinical instrument for obstetric applications which makes use of the Doppler shift principle is the foetus blood flow detector. The technique is extended to derive an integrated rate of the foetus heart from blood flow signals and to display it on a suitable display system.