8.4.2.1 PD Box Position and PD Box Size
In 2D imaging, the relations between 2D frame rate, line density, and sector width were
detailed to show how these three factors can be used to obtain optimal 2D images. A similar
relationship exists in Power-Doppler imaging. On the PD Submenu the line density selection
adjusts the balance between the 2D line density and the PD line density. The values available
are scan head-dependent.
The ability to change the PD Box size and position provides flexibility in Power-Doppler
imaging. The trackball changes the PD Box size and position.
Use the trackball to adjust the PD Box position on the 2D image (Single, Dual, Quad).
← → PD box horizontal position ↑ ↓ PD box vertical position
The box is adjustable within the entire 2D image area.
The upper trackball key switches between PD Box position and PD Box size. Press the
upper trackball key to change from PD Box position to PD Box size. Press it once more and
it returns to the position change.
↑ decrease the vertical PD box size
↓ increase the vertical PD box size
→ increase the horizontal PD box size
← decrease the horizontal PD box size
8.4.2.2 PD Gain Control
PD Gain must be adjusted properly to ensure that continuous flow is displayed, where
appropriate. PD Gain should be set as high as possible without displaying random Color
speckle. If you set the PD Gain control too low, then the lack of sensitivity will make it difficult
to detect small abnormalities in flow and will result in an underestimation of the large flow
disturbances.
PD Mode key (hard key)
By pressing the control [PD]
the PD mode is switched on. The PD Box appears on the active
2D image.
[PD Mode] key: Rotating adjusts the intensity of the PD signal.
When the GAIN control is turned clockwise Color becomes more intense. When the GAIN
control is turned counterclockwise Color becomes less intense.
8.4.2.3 2D + 2D/PD
The “2D+2D/PD” function changes the single image display to two simultaneous half frames.
The left frame shows only the 2D mode image. The right frame shows the 2D mode image
also with color information.
Switch on/off this mode by selecting the [2D+2D/PD] key.
Doppler Modes
8-20
Voluson® S6/S8 Basic User Manual
5433669-100 Revision 4
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