Ultra-low-dose computed tomography for torsion measurements of the lower extremities in children and adolescents

Table 4 Mean effective dose for the original scan (100%) and the simulated dose reductions (70%, 50%, 30%) for boys and girls, the respective scan region (hip, knee, ankle) and the sum of the effective dose (mean)

Dose	Mean effective dose hip boys (mSv)	Mean effective dose hip girls (mSv)	Mean effective dose knee boys (mSv)	Mean effective dose knee girls (mSv)	Mean effective dose ankle boys (mSv)	Mean effective dose ankle girls (mSv)	Sum of effective dose boys (mean) (mSv)	Sum of effective dose girls (mean) (mSv)
100%SD	0.420 ± 0.172	0.450 ± 0.173	0.030 ± 0.006	0.030 ± 0.005	0.010 ± 0.002	0.010 ± 0.003	0.460 ± 0.177	0.490 ± 0.178
70%	0.294	0.315	0.021	0.021	0.007	0.007	0.322	0.343
50%	0.210	0.225	0.015	0.015	0.005	0.005	0.230	0.245
30%	0.126	0.135	0.009	0.009	0.003	0.003	0.138	0.147