Stic (Spatio-Temporal Image Correlation) - GE Voluson S6 Basic User Manual

9.10 STIC (Spatio-Temporal Image Correlation)

Voluson® S6/S8 Basic User Manual
5433669-100 Revision 4
Press the Quad-screen-format button to activate Omni View Ref. Line view.
Press the Dual-screen-format button to activate Omni View dual view.
Press the Single-screen-format button to switch back to Omni View full format view.
General: STIC is an option. If this option is not installed, the [STIC] key is hidden.
With this acquisition method the fetal heart or an artery can be visualized in 4D. It is not a Real
Time 4D technique, but a post processed 3D acquisition.
•
STIC-Fetal Cardio is only available on RAB & RIC probes in the OB/GYN application
•
STIC-Vascular is only available on the RSP probe in the Peripheral Vascular application
Data is acquired for a predefined period of time (7.5 – 15 sec.). The acquired images are post
processed to calculate a 4D Volume Cine sequence representing one complete heart cycle.
In order to achieve a good result, try to adjust the size of the volume box and the sweep angle
to be as small as possible. The longer the acquisition time, the better the spatial resolution will
be. The user must be sure that there is minimal movement of the participating persons (e.g.,
mother and fetus), and that the probe is held absolutely still throughout the acquisition period.
Movement will cause a failure of the acquisition. If the user (trained operator) clearly
recognizes a disturbance during the acquisition period, the acquisition has to be cancelled.
A good STIC data set shows a regular and synchronous pumping of the fetal heart or of an
artery. Please make sure that the borders of the fetal heart or the artery are smooth and there
are no sudden discontinuities.
One or more of the following artefacts in the data set indicate a disturbance during acquisition:
•
Sudden discontinuities in the reference image B: These are due to motion of the mother,
the fetus or fetal arrhythmia during acquisition.
•
Sudden discontinuities in the color display: Motion of the mother, the fetus or fetal
arrhythmia affects the color flow in the same way it affects the gray image.
•
Fetal heart rate far to low or far to high: After acquisition the estimated fetal heart rate is
displayed. If the value does not correspond to the estimations based on other diagnostic
methods at all, the acquisition failed and has to be repeated.
Volume Mode
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