Rotation Steps
Defines how many contours have to be generated. The decision, which rotation step
should be chosen depends on the shape of the ROI.
For example: An angle setting of
30˚ means that after the first trace has been done,
the volume data set is rotated 30˚ and then the next trace has to be performed, and
so on. With rotation step
30˚, 6 traces have to be done (6˚ = 30, 9˚ = 20, 15˚ = 12
and 30˚ = 6 traces).
For symmetrical, roundish structures a 30˚ rotation step is fine for all generation
modes. For irregular shapes, select 15˚ for
Manual Trace and Trace Finder, and 9˚
for
Semi-auto Trace Finder.
Ref. Image
Select the reference image to which all image dependent functions like parallel
shifts, rotations, etc. are applied.
Start VOCAL
Start the volume calculation.
Note
Guidance and precautions for using VOCAL Contour Finder:
•
The accuracy of the VOCAL volume calculation is dependent on the accuracy of every
single VOCAL boundary.
•
The resulting VOCAL trace must be reviewed and checked by comparing the actual US
image on the monitor to the boundaries displayed in each rotation slice.
•
Only the US image on the monitor may be used for diagnostic purposes. The US Image
on the touch panel is considered a part of the user interface only. The image on the
touch panel is not in any way suited for diagnostic purposes.
Note
•
Semi-auto Trace Finder is faster than the Trace Finder method but less accurate. The
resulting VOCAL trace has to be reviewed with extreme care.
•
If the Trace Finder modes do not lead to satisfying results, use Manual Trace to create
the VOCAL trace.
VOCAL Main Menu
Figure 8-24 VOCAL Main Menu
3D and 4D Mode
Voluson™ SWIFT / Voluson SWIFT+ Instructions For Use
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Содержание Voluson Swift
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