The Doppler Principle Applied to Measurement of Blood Flow Velocity in Cerebral Arteries

  • R. Aaslid


The shift in frequency of a wave when either the transmitter or the receiver are moving with respect to the wave propagating medium was described by Doppler (1843). One of the earliest experiments to test this theoretical work was conducted by Buys Ballot (1845) with sound waves. In principle, sound and ultrasound are equivalent when deducting the formula of the frequency shift, whereas the deduction for electromagnetic waves will be different due to relativistic phenomena.


Doppler Shift Doppler Signal Ultrasonic Beam Projection Display Basal Cerebral Artery 


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Copyright information

© Springer-Verlag/Wien 1986

Authors and Affiliations

  • R. Aaslid
    • 1
  1. 1.Institute of Applied Physiology and MedicineSeattleUSA

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