Scan and Reconstruction
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 Siemens Multislice CT, we differentiate between:
Feed/Rotation, the table movement per rotation
Volume Pitch, table movement per rotation/single slice collimation.
Pitch Factor, table movement per rotation/complete slice collimation.
E.g., slice collimation = 2 x 5 mm, table moves 10 mm per rotation, then Volume Pitch = 2, Pitch Factor = 1.
With the SOMATOM Spirit, the pitch, slice, collimation, rotation time, and scan range can be adjusted. The pitch factor can be selected from
Pitch 1 | Pitch 1.5 | Pitch 2 |
Pitch Models
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