Scanning Modes
Vivid S5/Vivid S6 User Manual 191
R2424458-100 Rev. 2
cycles averaged is controlled from the Soft menu rocker. The
number of averaged cycles displayed on the top left corner.
Using TSI
1. Ideally, perform the AVO and AVC Event Timing
measurements prior to starting TSI. See "Event timing
measurements" on page 265.
2. From TVI, or Tissue Tracking mode, select
TSI.
3. Optionally adjust
THRESHOLD.
4. Use the trackball to position the ROI frame over the area
to be examined.
The assignable con-
trols of the trackball
are displayed in the
trackball status bar
in the bottom right
corner of the screen.
5. Press SET. The instruction Size should be highlighted in the
trackball status bar. If not, press
SET again to select Size.
Note: If the trackball control Pointer is selected, press
TRACKBALL to be able to select between Position and Size
controls.
6. 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 + 200 ms. is used.)
The system can be configured to automatically adjust the TSI
start marker to Aortic Valve Opening, providing that this event
is measured. If not measured, the default setting is used
(60 ms).
The system can be configured to automatically adjust the TSI
end marker relatively to the to Aortic Valve Closure (AVC) or
Mitral Valve Opening (MVO) event, providing that these events
are measured. If not measured, the TSI end marker is adjusted
relatively to the estimated End Systole.
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.
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