Siemens SOMATOM Sensation Cardiac Version A60 Operations Instructions download pdf (Page 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

are reconstructed with highest performance (up to

6-10 images per second). 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

performance, slice width has to be at least 3 times the

slice collimation.

During scanning the user will routinely 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 after completion of spiral.

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Siemens SOMATOM Sensation Cardiac Version A60 Operations Instructions Page 9