ABSTRACT
Flow and displacement imaging Ultrasonic B-mode real-time imaging can be combined with Doppler in a scanner so that the scanner is capable of providing not only anatomical information, but also blood flow data. Both sets of information are displayed simultaneously. A cursor line is typically superimposed on the B-mode image to indicate the direction of the Doppler beam. A fast Fourier transform (FFT) algorithm is used to compute the Doppler spectrum that is displayed in real time. This type of scanner is called duplex scanner. More recently, electronic and computer speed is fast enough to allow blood flow information superimposed on the B-mode image displayed in real time.
