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

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

BMI D E CTDIvol/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
  1. BMI body mass index, CTDIvol volume-computed-tomography dose index, DE effective diameter, SSDE size-specific dose estimate