Visualization; Principle Of Volume Acquisition; Volpre Mode - GE Voluson Swift Instructions For Use Manual

3D and 4D Mode

Principle of Volume Acquisition

VolPre mode

8.1 Visualization

8-2
The acquisition of volume data sets is performed with special transducers designed for 3D/4D
imaging. A volume data set consists of a series of 2D Images. The Volume acquisition is
started using a 2D-image with superimposed VOL-Box . The 2D start image represents the
central 2D scan of the volume. The volume scan itself sweeps from one margin to the other
margin of the volume to be acquired.
The volume scan is automatically performed by an automatic sweep of the transducer array
inside the housing. The scanned volume is similar to a section of a torus.
Abdominal
The VOL-Box frames the Region of Interest (ROI) on the actual 2D scan which will be stored
during the volume sweep. The range of the volume sweep is indicated by the Vol-Angle
Pictogram, which is displayed at the bottom right of the screen. This moving indicator gives
information about the position of the B image during the 3D volume scan. The sweep time
varies and depends on the VOL-Box size (depth range, angle) and the quality. The probe must
be held steady and in place during the 3D volume scan. The real time display of the swept B
frames allows continual observation of the scan quality. During the real time 4D scan it is not
necessary to hold the probe steady because of the continuous volume acquisition.
The position of the volume body in relation to the display plane is determined by a relative
coordinate system. This is made up of three orthogonal axes. The common intersection of
these axes is the central dot. These axes are displayed within the display plane - exactly in the
X-, Y- and Z-directions and colored. Rotation around any of these axes and displacement of
the center of rotation make any imaginable plane within the volume body display-able. The
INIT position of the volume body in relation to the display plane is reset-able; it is the start
situation after completion of a volume scan.
1. Central 2D scan
2. Start 2D scan
3. Range of VOL sweep
Transvaginal
Table 8-1 Transducer types
Voluson™ SWIFT / Voluson SWIFT+ Instructions For Use
5831612-100 Revision 4