GE LOGIQ 7, Basic User Manual

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Using 3D
LOGIQ 7 Online Help 5
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119
Direction 2392536-100 Rev. 1
Acquisition Mode Selections: Sensorless Parallel, Sensorless Sweep, With Sensor
Sensorless Parallel . In this mode the probe must be moved during 3D data
acquisition without angling it. You should scan the object you want to render in 2-4
seconds. The speed at which you scan should be constant. No sensor is mounted on
the probe.
• Since the time for post-processing depends on the acquired number of frames, it is
recommended that you check the frame rate. Low frame rates result in fewer
acquired frames for the 3D dataset which results in intensive post-processing
(interpolation). Therefore, low frame rate = long post-processing.
Sensorless Sweep . In this mode the probe must be moved to a position where you
can clearly see a middle cut of the object you want to scan and render. Tilt the probe
to about 30 degrees until the object you want to scan disappears. Start the acquisition
and tilt the probe over a distance of around 60 degrees until the object disappears
again. The entire scan time should be around 2-4 seconds. During the sweep, the
probe may not be moved parallel, just tilted. No sensor is mounted on the probe.
Before starting an acquisition, take care that the transmitter is positioned correctly
during data acquisition and that the transmitter cannot move.
Scan Plane Selections: Front to Back, Side to Side
Front to Back . After having scanned in this mode, the rendered dataset is shown in a
frontal view. For acquiring a fetal face in sagittal cuts, use this mode.
Side to Side . After having scanned in this mode, the rendered dataset is shown from
a side view. For acquiring a fetal face in coronal cuts, use this mode.
3D Starts the rendering process.
Scan Distance Adjusts the distance covered during the scan. Depending on the real width of a scan
acquired during a sensorless 3D acquisition, the volume of interest’s width can be
enlarged or reduced. You can adapt the form of a fetal face if the baby’s head looks
oval instead of round. The assumed default width of a parallel scan is 6 cm; of a fan
scan 60 degrees.
Table 5-8: 3D Acquisition Description and Instructions for Use
3D Parameter Description