Siemens SOMATOM Sensation Cardiac Version A60 Operations Instructions download pdf (Page 19)

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 for the SOMATOM Sensation

Cardiac.

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

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 indicates the Real Time display of images

during scanning. The Real Time displayed image series

has to be reconstructed after completion of spiral.

General

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Siemens SOMATOM Sensation Cardiac Version A60 Operations Instructions Page 19