chapter  66

Blood Flow Measurements

WithPer Ask, P. Åke Öberg

The ultrasound Doppler measurements [1,2] are based on a principle discovered by the Austrian physicist Christian Doppler in 1842 [3], who theoretically predicted that a wave backscattered from a moving object will be shifted in frequency. The principle was verified by two hornblowers, one aboard a moving train and the other standing still, with the ability to assess the pitch of the sound.