Siemens SOMATOM SENSATION CARDIAC A60 - Manual (Page 9)

9
General
Scan and Reconstruction
Slice Collimation and Slice Width
Slice collimation is the slice thickness collimated by
the tube collimator, which determines the Z-coverage
per rotation. In Multislice CT, this is divided by the
number of active detector channels (e. g. 16 x 0.75 mm).
Slice width is the true thickness 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 and algorithm,
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.
On the SOMATOM Sensation Cardiac some slice widths
are marked as “fast” (blue background). These images
will be reconstructed with highest performance (up
to 6-10 images per second). All others will be recon-
structed with up to 3 images per second.
The reconstruction time depends on slice collimation
and the reconstructed slice width. To get the fast
performance, slice width has to be at least 3 times the
slice collimation.
During scanning the user normally will get “real time”
reconstructed images in full image quality, if the “fast”
slice has been selected.
In some cases – this depends also on Scan range, Feed/
Rotation and Reconstruction increment – the Recon
icon on the chronicle will be labeled with “RT”. This indi-
cates the real time display of images during scanning.
The real time displayed image series has to be recon-
structed afterwards.