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. Author manuscript; available in PMC: 2014 Jan 24.
Published in final edited form as: AJR Am J Roentgenol. 2011 Jun;196(6):1279–1287. doi: 10.2214/AJR.10.5041

Table 2.

Scan parameters and volume CT dose index (CTDIvol).

80/140 kV with tin 80/140 kV
Additional tin filtration Yes No
Tube potential (A/B) 80/140 kV 140/80 kV
Effective mAs (A/B)* 340/184 62/341
Collimation 2×20×0.6 mm 2×20×0.6 mm
Rotation time (s) 0.5 0.5
Pitch 0.6 0.6
Automatic exposure control Off Off
CTDIvol (mGy) 16.4 18.3
*

effective mAs: effective tube-current-time product = tube current time product/pitch