Siemens EMOTION 16-Jun - Manual (Page 46)

46
Dose Information
For spiral scan protocols, the indicated mAs is the
effective mAs per image. The correlation between tube
current and effective mAs of spiral scans on a Multi-
slice CT scanner is expressed by the following formula:
where Slice collimation refers to the collimation of one
detector row, and nrow is the number of used detector
rows.
Effective mAs = mA x RotTime
Pitch Factor
Pitch Factor = Feed per Rotation
nrow x Slice collimation
mA = effective mAs x Pitch Factor
RotTime