Pulsed Wave Doppler Mode (Pw Mode) - GE Voluson S6 Basic User Manual

Doppler Modes

8.1 Pulsed Wave Doppler Mode (PW Mode)

8-2
Doppler Modes:
•
'Pulsed Wave Doppler Mode (PW Mode)'
•
'Continuous Wave Doppler Mode (CW Mode)' on page 8‐8
•
'Power Doppler Mode (PD Mode)'
•
'HD-Flow Mode (Bi-directional Angio Mode)'
•
'Tissue Doppler Mode (TD Mode )'
Doppler Functions and Filters:
'Doppler Mode Functions and Filters'
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
Chapter 2 and Chapter 5 for a complete explanation of the acoustic output.
refer to
For Pulsed Wave Doppler: 'Pulsed Wave Doppler Mode (PW Mode)'
For Continuous Wave Doppler: 'Continuous Wave Doppler Mode (CW Mode)'
A sample volume cursor is located on the PW cursor and it indicates where, along the
ultrasound beam, the spectral analysis is being performed. An angle correction 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: 'PW Main Menu'
To adjust PW setting: 'PW Sub Menu'
To use special utilities: 'Utilities'
on page 8-2
on page 8-17
on page 8-23
on page 8-27
on page 8-31
on page 8-3
on page 8-6
on page 13-2 and 'Gray Map' on page 6-22
on page 8-2
on page 8-8
Voluson® S6/S8 Basic User Manual
5433669-100 Revision 4