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syngo CT 2007E Emotion Operator Manual
02/2008
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Constancy Test Quality Assurance
F.3-22
Performing the MTF test
F.3
The spacial resolution is characterized through the modulation
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.
F.3
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.
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 MTF test is
started automatically.
F.3
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.
F.3
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