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(FFT) The fast Fourier transformation is a particularly fast and efficient computational method of performing a Fourier transformation, which is the mathematical process by which raw data is processed into a usable image.
The fast Fourier transform analyzer is a common device that performs spectral analysis in ultrasound instruments. In this case, it displays different quadrature Doppler frequencies or reflector velocities when a sample volume cursor is used along time. The Doppler frequency is proportional to the spectral reflector velocity.
See also Proportionality Constant, and Sampling Rate.

   
  
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The Mmode (Motionmode) ultrasound is used for analyzing moving body parts (also called timemotion or TMmode) commonly in cardiac and fetal cardiac imaging. The application of Bmode and a strip chart recorder allows visualization of the structures as a function of depth and time. The Mmode ultrasound transducer beam is stationary while the echoes from a moving reflector are received at varying times.
A single beam in an ultrasound scan is used to produce the onedimensional Mmode picture, where movement of a structure such as a heart valve can be depicted in a wavelike manner. The high sampling frequency (up to 1000 pulses per second) is useful in assessing rates and motion, particularly in cardiac structures such as the various valves and the chamber walls.

   
  
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