7S Probe Image Quality Tests - GE Vivid 3N Pro Series Service Manual

GE M S
EDICAL YSTEMS
D FK091075, R
IRECTION
4-4-1-11 CW Noise Test
Table 4-28
Step
1
2
3
4-4-2

7S Probe Image Quality Tests

4-4-2-1 2D Center Noise Test
NOTE: This test should be performed in a dark room.
Table 4-29
Step
1
2
3
4
4-18
04
EVISION
CW Noise Test (3S)
Task
With a 3S probe in the air, select a Cardiac
preset and activate CW-Mode.
Set the Audio Gain to the minimal level at
which the audio noise is just visible.
Move the cursor angle multiple times from one
half of the screen to the other.
2D Noise Center Test (7S)
Task
With a 7S probe in the air, select a Pediatrics
preset.
Reduce the 2D Gain until the background
noise disappears.
Increase the Gain until "flashlight" noise is
displayed in the center of the screen, as
shown opposite, and write down the Gain
value.
Increase the Gain until the background noise
is displayed, and write down the Gain value.
Section 4-4 - Image Testing: 2D/M/CFM/Doppler
V 3N P
IVID
Expected Result(s)
Check that the Doppler audio and display noise are homogenous
and constant.
Check that the noise level does not increase after the cursor angle
is changed.
Expected Result(s)
Ensure that the Gain difference is not higher than 2.
/E S M
RO XPERT ERVICE ANUAL