Siemens SOMATOM, Manual, Page: 24 / 590

24
Scan and Reconstruction
Acquisition, Slice Collimation
and Slice Width
Slice collimation is the slice thickness resulting from
the effect of the tube-side collimator and the adaptive
detector array design. In Multislice CT, the Z-coverage
per rotation is given by the product of the number of
active detector slices and the collimation (e.g. 6 x
1.0mm for the SOMATOM Emotion 6-slice configura-
tion or 16 x 0.6mm for the SOMATOM Emotion 16-
slice configuration ).
Slice width is the FWHM (full width at half maximum)
of the reconstructed image.
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 care about the algorithm any more;
the software does it for you.
If Metrorecon/Fastrecon is not selected you will rou-
tinely get “Real Time” images. The Recon icon on the
chronicle will be labeled with “RT”. After the scan the
Real Time displayed image series has to be recon-
structed.
In some cases – this depends also on Scan pitch and
Reconstruction increment – the Recon icon on the
chronicle will be labeled with “RT”. This indicates the
Real Time display of images during scanning. The Real
Time displayed image series has to be reconstructed
after completion of spiral.
The Acq (Acquisition) is displayed on the Examination
task card. The Acquisition is simply "number of slices
acquired per rotation" x "width of one slice".