GE Vivid S70, User Manual

Page: 173 / 709

Tissue Synchronization Imaging (TSI)
Vivid S70 / S60
–
User Manual
5-37
BC092760-1EN 01
Using TSI
1. Ideally, perform the AVO and AVC Event Timing
measurements prior to starting TSI. See ‘Event timing
measurements’ on
page 8-11
.
2. From TVI, Tissue Tracking, Strain or Strain rate mode,
select TSI .
3. Use the trackball to position the ROI frame over the area to
be examined.
4. Press Select . The instruction
Size
should be highlighted in
the trackball status bar.
NOTE: If the trackball control Pointer is selected, press Trackball to
be able to select between Position and Size controls.
5. Use the trackball to adjust the dimensions of the ROI.
TSI markers adjustments
The default TSI markers settings are:
• TSI start : The time of the Event Timing measurement Aortic
Valve Opening (AVO). (If no AVO measurement is available,
60 ms from the detected QRS is used.)
• TSI end : The time of the Event Timing measurement Aortic
Valve Closure (AVC). (If no AVC measurement is available,
an estimated time of end systole is used.).
The system can be configured to not use AVO and AVC for TSI
start and end, or to use other events.
The configuration alternatives are:
• TSI start : AVO, 60, 80, 100, 120 ms, or Manual control
• TSI end : AVC, AVC - 200 ms, AVC - 150 ms, AVC - 100 ms,
AVC - 50 ms, AVC, AVC + 50 ms, AVC + 100 ms,
CAUTION
TSI is only recommended for adult cardiac images acquired
with the following probes: M5Sc-D, 6Tc-RS or 6VT-D. The
measurement accuracies of the TSI time-to-peak values
reported in the Reference manual are verified with these
probes.
CAUTION
TSI requires correct QRS detection to function properly.
Therefore always check that the yellow circle markers on the
ECG are positioned correctly on each QRS complex before
proceeding with the analysis.