Scanning Modes
176
Vivid S5/Vivid S6 User Manual
R2424458-100 Rev. 2
Radial Averaging
Smooths the image by averaging collected data along the
same radial line. An increase of the radial averaging will reduce
noise, but this will also reduce the radial resolution.
Power
Controls the amount of acoustic power applied. When power is
reduced the signal to noise ratio is reduced, so that the image
may become noisier.
Cine Compound (Freeze only)
Calculates and displays cineloops generated from a temporal
averaging of multiple consecutive heart cycles. The number of
cycles averaged is controlled from the Soft menu rocker. The
number of averaged cycles displayed on the top left corner.
Using Tissue Tracking
1.
From 2D or TVI Modes, press
ALT
on the control panel and
select the
TISSUE TRACKING
assignable.
2.
Adjust
TRACKING START
(assignable) close to the R-peak.
3.
Adjust
TRACKING END
(assignable) near the T-wave.
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.
Optimizing Tissue Tracking
•
To reduce quantification noise (variance), the Nyquist limit
should be as low as possible, without creating aliasing. To
reduce the Nyquist limit, reduce the scale while in TVI.
•
To check for aliasing, freeze the loop and apply velocity
trace (Press
FREEZE
and
Q-ANALYSIS
), see also Chapter 8,
"Quantitative Analysis" on page 375).
•
The main use of Tissue Tracking is to map positive systolic
displacements. This means that
TRACKING START
and
TRACKING END
assignables should be adjusted to pick out
the systolic phase of the cardiac cycle: Adjust
Tracking
Содержание Vivid S5
Страница 18: ...Revision History xvi Vivid S5 Vivid S6 User Manual R2424458 100 Rev 2 ...
Страница 30: ...Introduction 12 Vivid S5 Vivid S6 User Manual R2424458 100 Rev 2 ...
Страница 154: ...Basic scanning operations 136 Vivid S5 Vivid S6 User Manual R2424458 100 Rev 2 ...
Страница 250: ...Stress Echo 232 Vivid S5 Vivid S6 User Manual R2424458 100 Rev 2 ...
Страница 260: ...Contrast Imaging 242 Vivid S5 Vivid S6 User Manual R2424458 100 Rev 2 ...
Страница 420: ...Quantitative Analysis 402 Vivid S5 Vivid S6 User Manual R2424458 100 Rev 2 ...
Страница 508: ...Archiving 490 Vivid S5 Vivid S6 User Manual R2424458 100 Rev 2 ...
Страница 600: ...Peripherals 582 Vivid S5 Vivid S6 User Manual R2424458 100 Rev 2 ...
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