. Author manuscript; available in PMC: 2015 Jul 2.

Published in final edited form as: J Comput Assist Tomogr. 2015 May-Jun;39(3):437–442. doi: 10.1097/RCT.0000000000000221

TABLE 3.

Noise Index Technique Chart Used in Our Adult Abdominal CT Practice for an AEC System That Uses the Constant Noise Paradigm (VCT; GE Healthcare)

Lateral Patient Width, cm	Noise Index	Rotation Time, s	Minimum Tube Current, mA	Maximum Tube Current, mA
22.1–30	9	0.5	150	280
30.1–40	11.5	0.5	220	500
40.1–45	14.5	0.5	400	720
45.1–50+	17	0.7	450	770

These values are for 5-mm slice thicknesses. A gantry rotation of 0.5 seconds is used until patient size exceeds 45 cm, when a gantry rotation of 0.7 seconds is required to achieve sufficient tube output.