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syngo CT 2007E Emotion Operator Manual
02/2008
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Constancy Test Quality Assurance
F.3-20
Performing the pixel noise
test
F.3
The pixel noise is determined from two tomograms of the water
phantom in the same way as for the daily quality measurement.
(→ Page F.2-1 Daily Quality Measurements)
F.3
F.3
✧ Press the Start key on the control box.
Scanning is started.
F.3
i
.3
F
After the previous test has been completed, the Noise test is
started automatically.
F.3
Two images of the water phantom are recorded with identical
parameters. The difference between the first and the second
measurement is shown.
F.3
The following evaluations are displayed:
F.3
❏ ROI
❏ Mean value of the CT value
❏ Sigma value (pixel noise)
F.3
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