TABLE 1

Estimated CT Doses (mGy) and Effective Doses (mSv) from Various Combinations of kVp and mA

kVp	mA	CT dose index volume (mGy)	mSv
120	600	19.61	32.4
120	300	10.18	16.2
120	80	2.63	4.3
120	40	1.32	2.2
120	30	0.99	1.6
120	20	0.66	1.1
120	10	0.33	0.5
100	600	15.25	20.6
100	300	7.68	10.3
100	80	2.06	2.7
100	40	1.03	1.4
100	30	0.77	1.0
100	20	0.55	0.7
100	10	0.26	0.3
80	160	1.73	2.7
80	80	0.87	1.4
80	30	0.43	0.5
80	20	0.22	0.3
80	10	0.11	0.2
80	10*	0.08	0.1

All 120-kVp CT scans use 0.4-s rotation time and pitch of 0.984. All 100- and 80-kVp CT scans use 0.5-s rotation time and pitch of 0.984, except for 0.4-s rotation time and pitch of 1.375, where noted by asterisk.