Doppler is a common term used in ultrasound for diagnosing discrepancies in the hemodynamics of blood flow. You can use both color Doppler and power Doppler to see the blood flow. Doppler ultrasonography has proved to be useful in most of the applications where diagnostic ultrasound takes place.
There are generally three types of Doppler ultrasound used namely Continuous Wave Doppler, Color Doppler and Duplex Doppler.
Continuous Wave Doppler: Continuous Wave Doppler ultrasound machine uses two crystals, the first one for sending echoes and the second for receiving them. The transmitter emits a continuous wave for the receiver to detect the phase shift. After this an audible sound is recorded and analyzed.
This type of Doppler ultrasound provides high sensitivity to low velocities and detects high velocities without aliasing. This ultrasound machine cannot make out the difference whether the signals have been sent or received. Unlike, pulsed wave Doppler the continuous wave Doppler does not produce any images.
Duplex Doppler: Duplex Doppler ultrasound has standard ultrasound methods for producing the image of the blood vessel and its surrounding organs. After the image has been produced, a computer is used to convert the Doppler sounds into a graph. This further provides information about the speed as well as the direction of the blood flow through the blood vessel that was being evaluated.
Color Doppler: The color Doppler also has standard ultrasound methods for producing an image of a blood vessel. Here also, a computer is used for converting the Doppler sounds into colors which are overlaid on the image of the blood vessel. This represents the speed as well as the direction of blood flow through the vessel. Power Doppler is one of the types of color Doppler. This helps in detecting some of the images which are difficult or sometimes impossible to get with the help of a standard color Doppler. It is most commonly used for evaluating blood flow through vessels within solid organs.
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