Siemens SOMATOM Emotion syngo CT 2007E Operator's Manual page 482

Constancy Test
Performing the MTF test
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syngo CT 2007E
02/2008
The spacial resolution is characterized through the modulation
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transmission function (MTF). It describes the contrast ampli-
tude of bar patterns with different local frequencies shown in
the image relative to an ideal transmission.
The 2% value of the MTF is the local frequency at which the con-
trast of periodical bar patterns of this local frequency is reduced
to 2%. In practice, the MTF values are determined using a single
thin wire.
Press the Start key on the control box.
Scanning is started.
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After the previous test has been completed, the MTF test is
i
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started automatically.
The MTF is represented graphically as a function of the local fre-
quency (LP/cm). In addition, three characteristic values, 50%
MTF, 10% MTF an 2% MTF are displayed.
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