10
General
The following tables show you the possibilities of image
reconstruction in spiral and sequential scanning.
Slice Collimation and Slice Width for Spiral Mode
0.75 mm 0.75, 1, 1.5, 2, 3, 4, 5, 6, 7, 8, 10 mm
1.5 mm 2, 3, 4, 5, 6, 7, 8, 10 mm
Cardio Spiral Modes
0.75 mm 0.75, 1.0, 1.5, 2,3 mm
1.5 mm 2, 3, 4, 5 mm
Slice Collimation and Slice Width for Sequence Mode
0.75 mm 0.75, 1.5, 3, 4.5, 9 mm
1.5 mm 1.5, 3, 4.5, 6, 9 mm
5 mm 5, 10 mm
ECG triggered Modes
0.75 mm 0.75, 1.5, 3 mm
1.5 mm 1.5, 3, 6 mm
Pitch
In single slice CT:
Pitch = table movement per rotation/slice collimation
E.g.: slice collimation = 5 mm,
table moves 5 mm per rotation, then pitch = 1.
With the SOMATOM Sensation Cardiac, in Siemens
Multislice CT, we differentiate between:
Feed/Rotation, the table movement per rotation
Volume Pitch, the table movement per rotation/single
slice collimation
E.g.: single slice collimation = 1.5 mm, table moves
24 mm per rotation, then the Volume Pitch = 16
Pitch Factor, the table movement per rotation/
collimation
E.g.: slice collimation = 16 x 1.5 mm, table moves
24 mm per rotation, then the Pitch Factor = 1
With the SOMATOM Sensation Cardiac, you do not
need to select pitch. Once the scan range, scan time,
slice collimation, and rotation time is defined, the
software will adapt the table feed per rotation accor-
dingly. The Pitch Factor can be freely adapted from
0.5 to 1.5.