Siemens SOMATOM Manual&Nbsp;

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

Siemens SOMATOM Specifications

General

Category	CT Scanner
Rotation Time	0.25 seconds
Tube Voltage	70-150 kV
Bore Size	78 cm
Max Table Load	250 kg
Gantry Aperture	78 cm
Table Weight Capacity	250 kg
X-ray Tube Voltage	70-150 kV
Scan Time per Rotation	0.25 seconds
Software	Syngo
Connectivity	DICOM