GE H48681XB, Service Manual

Page: 188 / 366

5.1.4.12 Advanced STIC (Spatio-Temporal Image Correlation)
Note The option “Advanced STIC” is NOT available for Voluson E6 systems.
5.1.4.12.1 STIC “Basic” (Spatio-Temporal Image Correlation)
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.
In order to archive 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. A good STIC, STIC CFM
(2D+CFM), STIC PD (2D+PD) or STIC HD (2D+HD-Flow) data set shows a regular and synchronous
pumping of the fetal heart or of an artery.
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. The acquired images are post processed to calculate a 4D Volume Cine sequence. Please
make sure that the borders of the fetal heart or the artery are smooth and there are no sudden
discontinuities. If the user (trained operator) clearly recognizes a disturbance during the acquisition period,
the acquisition has to be cancelled.
•
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.
Note “STIC” is part of the “Advanced STIC” option for Voluson E8. At Voluson E6 systems it is optional (separately
purchasable).
5.1.4.12.2 STIC M-Mode
Creates a M-spectrum from a STIC acquisition (capture of a full fetal heart cycle in real-time saved as a
volume for later analysis). After activating STIC M-Mode the STIC cine is running and the STIC M-spectrum
will be shown. In STIC-M all M-Measurements are possible. Furthermore the M-cursor is available as a
freeform line type.
•
can be done in A, B or C Plane and can be done postprocessing
•
possibility to perform measurements for evaluation of ventricle contraction
•
possibility to easily detect End Systole and End Diastole for ventricular measurements
5.1.4.12.3 STIC flow
Clinical application and advantage:
The STIC function, that is generally used to display high flow velocities at the heart, is now used to represent
slow flow (tumor blood circulation) of vessels over the time. One of the objectives is, to display ovarian
tumors (which are frequently found in GYN applications), to observe them over the time and consequently
visualize them in 4D and/or evaluate them via histogram.
Function:
Similar to STIC Cardio-acquisitions, a volume sweep is made of the lesion. Afterwards the computer displays
the heart rate and vessels in multiplanar view and/or visualizes it in 4D
5.1.4.13 SonoNT
SonoNT is an additional function for manual NT (Nuchal Translucency) measurement. This function supports
the user to find the correct position for the NT measurement. The user can switch between NT Method
“Manual” and “Sono NT” (semi-automatic).
A Box has to be placed for the NT-ROI. Then the NT-distance is calculated automatically, a graphic (yellow
head-image) and the NT-result are displayed.
If no result is found a temporary warning “No valid NT-distance found!” is displayed.
5.1.4.14 SonoIT
SonoIT = Sonography based Intracranial Translucency measurement
SonoIT is a Semi-automatic measurement for the Intracranial Transluceny. The IT-button can be found in the
“Early Gestation” section beside the NT-button.
The workflow of this measurement is identical to the SonoNT measurement.
Components and Functions (Theory)
5-16
Voluson E-Series Service Manual
KTD106657 Revision 2