Increment; Pitch - Siemens SOMATOM Manual

Scan and Reconstruction

Increment

The increment is the distance between the recon-
structed images in Z direction. When the chosen incre-
ment is smaller than the slice thickness, the images are
created with an overlap. This technique is useful for
reducing partial volume effect, giving you better detail
of the anatomy and high quality 2D and 3D postpro-
cessing.
The increment can be freely adapted from 0.1 - 10
mm.

Pitch

Pitch = feed per rotation
z-coverage
z-coverage = detector rows x collimated slice width
Feed/Rotation = table movement per rotation
The Pitch Factor can be freely adapted from 0.45 – 2.0,
in Cardio, there is a fixed pitch down to 0.1.
With the SOMATOM Emotion 6/16-slice configuration,
you select the slice collimation together with the slice
width desired.
The slice width is independent of pitch, i.e. what you
select is always what you get. Actually, you do not
need to be concerned about the algorithm any more;
the software does it for you.
Pitch values with a step width of 0.05 can be selected
for all modes.
We recommend to use a Pitch Factor of 0.45 for MPR
reconstructions.
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