7 - 2 Operator’s Manual
7 Smart 3D
• VOI (Volume of Interest): a volume box used to display 3D image (VR) by adjusting
interesting region in MPR.
7.1.2 ROI and VOI
After the system enters 3D imaging, a B image with ROI displays on the screen. A line (shown in
the following figure) that shows the upper edge position of VOI is inside ROI.
Define the ROI and curved VOI:
• To define a ROI, please remove the useless data as to reduce the volume data and shorten the
time for image storing, processing and reconstruction.
• Set ROI on the 2D image with the largest section area of the fetal face.
• Set ROI a little larger than the fetal head.
Perform the following procedure:
1. Press the right <Set> key to toggle among setting the ROI position, size or curved VOI.
2. Use the trackball/trackpad to change the ROI size, position and curved VOI,
3. Press the left <set> key to adjust VOI angle.
Depending on the view direction, the orientation and the shape (line or dot) of curved VOI vary:
12D image
2ROI
3 Cut plane
View Curved VOI
U/D At the upper part of curved VOI
D/U At the lower part of curved VOI
L/R At the left part of curved VOI
R/L At the right part of curved VOI
F/B Displays as a dot
B/F Displays as a dot
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