Spectral Doppler Mode; Spectral Doppler Mode; Pw Mode (Pulsed Wave Doppler) - GE VOLUSON 730Pro Basic User Manual

Spectral Doppler Mode

7.

Spectral Doppler Mode

Doppler imaging includes a spectral analysis which describes the Doppler shift signal from the moving
reflectors within a sample volume. The spectral display scrolls from right to left and depicts the
spectral distribution of the components of the Doppler shift frequency over time.
Frequency or velocity values appear on the vertical axis and time along the horizontal axis.
Component amplitudes appear as shades of gray. The brighter the shade, the higher the amplitude.
The Doppler display can be used alone, but it is normally used with a 2D image.
The 2D image contains a Doppler cursor that defines the location of the Doppler ultrasound beam
relative to the 2D image display.
The flow direction cursor can be aligned with the direction of flow within the vessel to determine the
Doppler angle. The system uses the Doppler angle to calibrate the Doppler velocity display. When the
Doppler frequency display is used, the frequency display is not calibrated to account for the Doppler
angle.
The Doppler display consists of the following: the spectral analysis display of the ultrasound data,
patient data and identification, image information, a gray scale map, a velocity or frequency scale, and
a time scale.
The TI and MI values on the monitor depend on the values set by the Doppler controls.
Please refer to Safety (chapter 2)
the acoustic output.
7.1

PW Mode (Pulsed Wave Doppler)

A sample volume cursor is located on the PW cursor and it indicates where, along the ultrasound
beam, the spectral analysis is being performed. A flow direction cursor can be added to the sample
volume.
The PW mode is subdivided in two groups. In these groups you will see how to use PW mode and
how to adjust the PW settings.
To use the PW mode review:
To adjust PW setting review:
To use special utilities review:
7-2
and Probes and Biopsy
PW Main Menu (chapter 7.1.1)
PW Sub Menu (chapter 7.1.3)
Utilities (chapter 12) and
(chapter 20) for a complete explanation of
Gray Chroma Map (chapter 12.1)
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Voluson 730Pro - Basic User Manual
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