Siemens syngo CT 2005C - Manual (Page 31)

Dose Information
31
For spiral scan protocols, the indicated mAs is the
effective mAs per image. The correlation between tube
current mA and effective mAs of spiral scans on a Mul-
tislice CT scanner is given by the following formula:
where Slice collimation refers to the collimation of one
detector row, and nrow is the number of used detector
rows.
Pitch Factor =
Feed/Rot
nrow x Slice collimation
mA = effective mAs x Pitch Factor
Rot Time
Effective mAs = mA x RotTime/Pitch Factor
C2-025.630.01.01.02_APPLICATIONGUIDE_SPIRIT.book Page 31 Friday, April 8, 2005 9:55 AM