8.2 General advice to obtain good rendered 3D/4D images
B-Mode
•
Poor quality of the volume scan will lead to a poor quality 3D image.
•
For a good 3D image quality, adjust high contrast in 2D mode of the interesting
structures before starting the volume scan.
•
Only the ultrasound data within the ROI (render box) will be calculated and displayed.
•
The correct placement of the ROI is essential for a good result, because the ROI
determines the view onto the interesting object.
•
Surface Mode: note that the surface of interest has to be surrounded by hypo echoic
structures; otherwise the system is unable to define the surface. With the function
“THRESHOLD” echo structures adjacent to the surface can be "cut off" if their gray
values are much lower than the gray values of the surface structures.
•
Minimum Mode: note that the interesting objects (vessels, cysts) should be surrounded
by hyper echoic structures. Avoid dark areas (shadows caused by attenuation, dark
tissue presentation) within the ROI, otherwise large parts of 3D images will be displayed
dark.
•
Maximum Mode: avoid bright artefact echoes within the ROI, otherwise these artefacts
are displayed in the 3D images.
•
X-Ray Mode: note that all gray values within the ROI are displayed. Therefore, in order
to enlarge the contrast of the structures within the ROI, the depth of the ROI should be
adjusted as low as allowable.
8.3 Initial Condition of different Probes
Select the
Init
button to reset the rotations and translations of a volume section to the initial
(start) position.
•
A - anterior (ventral)
•
P - posterior (dorsal)
•
Cr - cranial
•
Ca - caudal
•
R - right
•
L - left
Table 8-2 Directions
The sectional image A represents the 2D image visible in the Vol preparation area.
3D and 4D Mode
Voluson™ SWIFT / Voluson SWIFT+ Instructions For Use
5831612-100 R
evision 4 8-7
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