GE FK000040, Service Manual

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GE M
EDICAL
S
YSTEMS
D
IRECTION
FK091075, R
EVISION
04 V
IVID
3N P
RO
/E
XPERT
S
ERVICE
M
ANUAL
Chapter 4 Functional Checks 4-25
4-4-5 Probe 10S Image Quality Tests
4-4-5-1 2D Center Noise Test
NOTE: This test should be performed in a dark room.
4-4-5-2 Doppler Artifacts Test
4-4-6 2D (Pencil) Probe Image Quality Test
4-4-6-1 Image Quality Test
Table 4-39 2D Noise Center Test (10S)
Step Task Expected Result(s)
1
Perform this test with a 10S probe in the air for all the
probe ports.
2
Reduce the 2D Gain until the background noise
disappears.
3
Increase the Gain until “flashlight” noise is displayed in
the center of the screen, as shown opposite, and write
down the Gain value.
4
Increase the Gain until background noise is displayed,
and write down the Gain value.
Ensure that the Gain difference is not higher than 4.
Table 4-40 Doppler Artifacts Test (10S)
Step Task Expected Result(s)
1
Perform this test in PW and CW Modes.
2
Find a suitable surface that can simulate a signal on the
neck (for example, RMI1425A) and look for artifacts in all
possible frequencies.
No artifacts are detected.
Table 4-41 Image Quality Test (2D Pencil Probe)
Step Task Expected Result(s)
1
Activate CW Mode.
2
Find a signal in the neck or other suitable surface.
Find a suitable surface that can simulate a signal on the
neck (for example, RMI1425A) and look for artifacts
while searching for a signal.
No artifacts are detected.