|
|
|
Doppler ultrasound is based upon the
Doppler Effect. When the object
reflecting the ultrasound waves is moving, it changes the frequency of
the echoes, creating a higher frequency if it is moving toward the probe
and a lower frequency if it is moving away from the probe. How much the
frequency is changed depends upon how fast the object is moving. Doppler
ultrasound measures the change in frequency of the echoes to calculate
how fast an object is moving. Doppler ultrasound has been used mostly to
measure the rate of
blood flow through the
heart and major arteries.
|
|
|
|
|
