Using body mass index to estimate individualised patient radiation dose in abdominal computed tomography

European Radiology Experimental

Table 3 Conversion factors to convert volume-computed-tomography dose index (CTDI_vol) to size-specific dose estimate (SSDE) based on body mass index (BMI)

BMI	D _E	CTDI_vol/SSDE conversion factor
15	20.8	1.73
16	21.6	1.68
17	22.3	1.63
18	23.1	1.59
19	23.8	1.54
20	24.6	1.50
21	25.4	1.46
22	26.1	1.42
23	26.9	1.38
24	27.6	1.34
25	28.4	1.31
26	29.2	1.27
27	29.9	1.23
28	30.7	1.20
29	31.4	1.17
30	32.2	1.14
31	33.0	1.10
32	33.7	1.07
33	34.5	1.04
34	35.2	1.02
35	36.0	0.99
36	36.8	0.96
37	37.5	0.93
38	38.3	0.91
39	39.0	0.88
40	39.8	0.86
41	40.6	0.84
42	41.3	0.81
43	42.1	0.79
44	42.8	0.77
45	43.6	0.75
46	44.4	0.73
47	45.1	0.71
48	45.9	0.69
49	46.6	0.67
50	47.4	0.65

BMI body mass index, CTDI_vol volume-computed-tomography dose index, D_E effective diameter, SSDE size-specific dose estimate