Operating instructions

26
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.
16 x 0.75 mm).
Slice width is the FWHM (full width at half maximum)
of the reconstructed image.
With the SOMATOM Sensation Cardiac, 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 soft-
ware does it for you.
On the SOMATOM Sensation Cardiac some slice widths
are marked as “fast” (blue background). These images
are reconstructed with highest performance. All others
will be reconstructed up to 3 images per second.
The reconstruction time depends on slice collimation
and the reconstructed slice width. To get the fast per-
formance, slice width has to be at least 3 times the
slice collimation.