Table 4.

Size-specific k-factors (mSv mGy⁻¹ cm⁻¹) for head and neck, head and neck CT scans for a series of consecutive effective diameter (cm).

Effective diameter (cm)	Head and neck	Head	Neck
5	0.016		0.033
6	0.015		0.028
7	0.014		0.023
8	0.013	0.010	0.017
9	0.012	0.009	0.012
10	0.011	0.009	0.009
11	0.010	0.008	0.006
12	0.009	0.007	0.005
13	0.008	0.007	0.005
14	0.007	0.006	0.004
15	0.005	0.005	0.004
16	0.004	0.004
17	0.003	0.002
18	0.003	0.002
19	0.003	0.001
20	0.002	0.001