Siemens SOMATOM Emotion syngo CT 2007E Operator's Manual page 533

Quality Assurance
Testing the spatial and contrast
resolution
syngo CT 2007E
02/2008
With the luminance meter, measure the minimum contrast
(L ) and the maximum contrast (L
min.
The ratio L
max.
(≥ 40:1).
You can simply increase the contrast ratio by reducing the envi-
i
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ronmental lighting intensity. However, make sure that enough
light is available for reading and writing.
The visual resolution is checked in this test.
Select test image 2 or test image 3.
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Check the lines of the grid with a modulation of 100% high
contrast (HC) at the center and in the four corners.
The lines of the grid must be recognizable.
Constancy Test of the Monitor
/L is calculated as maximum contrast MK
min.
).
max.
Emotion Operator Manual
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