
Chapter 4 Diagnosis Modes
4-21
PW Spectral Doppler Mode
PW stands for Pulse Wave. PW Spectral Doppler Mode gives information on the speed of blood flow at
a specific site in the form of a spectral trace and audio signal. Distance (depth) information can also be
obtained by transmitting pulses over time frames.
This mode is useful for measuring low-speed blood ow such as in the abdomen and peripheral vessels. The
2D Mode image is also shown, allowing the marking and adjustment of an observation area within the entire
image.
[Figure 4.7 PW Spectral Doppler Mode]
Entering and Exiting PW Spectral Doppler Mode
Press the PW button on the control panel. Press it again to return to 2D Mode.
Press the Set button on the control panel to obtain a spectral doppler image.
PW Spectral Doppler Mode Screen
On the Spectral Doppler Mode image, the horizontal axis represents time, and the vertical axis represents
speed (or frequency).
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