Table 4.

Mean brain doses by tally region type with coefficients of variation within each tally region, and the coefficient of variation (CV) across tally regions for each patient

Name	0.6 cc volume (#1)		Slab (#2)		Entire scan volume (#3)		Across regions
	D brain,1 (mGy/mAs)	CV (%)	D brain,2 (mGy/mAs)	CV (%)	D brain,3 (mGy/mAs)	CV (%)	CV (%)
Peds2	0.257	2.6	0.254	4.2	0.273	5.0	3.9
Peds1	0.290	1.7	0.286	5.3	0.284	4.8	1.1
Baby	0.292	1.4	0.286	3.4	0.283	5.6	1.6
Peds3	0.230	2.5	0.226	4.0	0.238	7.3	2.6
Peds5	0.200	2.6	0.197	4.8	0.197	5.9	0.9
Peds4	0.217	2.0	0.215	4.8	0.216	6.7	0.5
Child	0.229	1.9	0.227	2.9	0.221	4.9	1.8
Helga	0.204	1.3	0.207	4.8	0.198	7.1	2.3
Irene	0.212	1.2	0.210	5.6	0.204	6.4	2.0
Golem	0.217	0.8	0.211	5.0	0.208	5.9	2.2
Visible human	0.188	1.7	0.187	6.5	0.180	9.4	2.4
Regina	0.216	2.5	0.215	5.3	0.207	7.8	2.3
Donna	0.210	2.8	0.214	4.4	0.203	7.1	2.7
Rex	0.197	0.8	0.195	3.9	0.189	5.9	2.1
Frank	0.190	1.4	0.185	5.0	0.178	9.2	3.3