GE H
EALTHCARE
PROPRIETARY TO GE
D
IRECTION
5394227, 12
LOGIQ S8/LOGIQ E8 S
ERVICE
M
ANUAL
4 - 32
Section 4-4 - Functional Checks
4-4-10-3
Adjust the TVI Controls
•
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
value.
NOTE:
The Scale value also affects the frame rate. There is a trade off between the frame rate and
quantification noise.
•
TVI provides velocity information only in the beam direction. The apical view typically provides the
best window since the beams are then approximately aligned to the longitudinal direction of the
myocardium (except near the apex). To obtain radial or circumferential tissue velocities, a
parasternal view must be used. However, from this window the beam cannot be aligned to the
muscle for all the parts of the ventricle.
NOTE:
PW will be optimized for Tissue Velocities when activated from inside TVI.
4-4-11
SWE (Shear Wave “Shear Elasto”) Functional Check
•
Select a probe (9L D and C1-6D).
•
Select ELASTO button.
•
In the Touch Panel, select Shear Wave button if not already selected.
•
Verify that the Shear Wave button is available.
4-4-12
Cineloop Check
4-4-12-1
Introduction
A cineloop is a sequence of images recorded over a certain time frame. When using ECG the time frame
can be adjusted to cover one or more heart cycles. When frozen, the System automatically displays the
cineloop boundary markers on either side of the last detected heart cycle.
4-4-12-2
Preparation
1.) Connect one of the probes, to the scanner’s active probe connector.
-
see:
3-6-4 "Connecting Probes" on page 3-15
for info about connecting the probes.
-
For available probes, see:
Section 9-13 "Probes" on page 9-59
2.) Turn ON the scanner. The B-Mode window is displayed (default mode).
4-4-12-3
Checks
1.) Press
Freeze
.
2.) Rotate the
Trackball
to scroll through the acquisition and find the sequence of interest.
3.) Select
Run/Stop
to playback the loop.
4.) Select
Run/Stop
again to stop the CINE Loop.
5.) Adjust
Cycle
select
to move from heart beat to heart beat and select the heart cycle of interest.
6.) Adjust
Num cycles
to increase or decrease the number of heart beats to be played back.
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