GE Vivid S70, User Manual

Page: 295 / 709

Advanced cardiac measurements and analysis
Vivid S70 / S60
–
User Manual
8-17
BC092760-1EN 01
CAUTION
The Time to peak measurement in Q Analysis may differ from
the TSI Time to peak measurements due to the following
considerations:
• The TSI Time to peak measurements find the maximum
velocity only within the TSI search interval. If the desired
peak on the velocity trace is outside the TSI search
interval, the TSI Time to peak measurements will return a
different result than the manual Time to peak
measurement.
• If the maximum velocity is at one of the ends of the TSI
search interval, the TSI time to peak measurements return
the time of the end of the TSI search interval. In some
cases the falling flank of an iso-volumic contraction peak at
the time of TSI Start or the rising flank of a post-systolic
contraction peak at the time of TSI End may be detected.
In a manual measurement the time to a peak within the TSI
search interval with a lower velocity than the velocity at the
end of the interval may be measured instead. The color
map
TSI Trace
may be used to identify regions in the
image where the peak detection is near the ends of the TSI
search interval. The TSI Trace tool should be used to verify
TSI measurements in the identified regions.
• If there are two or more peaks of comparable velocity
within the TSI search interval, or a poor signal quality, the
TSI Time to peak measurements may return the time to a
different peak than what a manual method would do.
Typically in these situations, the TSI image will show a
wide range of colors over a small spatial region.