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! "
Table 1. This table provides conversion factors based on the use of the 32 cm diameter PMMA phantom for CTDIvol. Table 1A shows the
conversion factor as a function of the sum of the lateral and AP dimensions. Table 1B shows conversion factors as a function of the lateral
dimension, and Table 1C is for the AP dimension. Table 1D provides conversion factors as a function of effective diameter. It is essential that
these data be used when the CTDIvol reported is known to be based on the 32 cm diameter body dosimetry phantom.
Table 1A
Lat+AP
Dim (cm)
Effective
Dia (cm)
Conversion
Factor
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
7.7
8.7
9.7
10.7
11.7
12.7
13.7
14.7
15.7
16.7
17.6
18.6
19.6
20.6
21.6
22.6
23.6
24.6
25.6
26.6
27.6
28.6
29.6
30.5
31.5
32.5
33.5
2.79
2.69
2.59
2.50
2.41
2.32
2.24
2.16
2.08
2.01
1.94
1.87
1.80
1.74
1.67
1.62
1.56
1.50
1.45
1.40
1.35
1.30
1.25
1.21
1.16
1.12
1.08
Table 1B
Lateral
Dim (cm)
Effective
Dia (cm)
Conversion
Factor
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
9.2
9.7
10.2
10.7
11.3
11.8
12.4
13.1
13.7
14.3
15.0
15.7
16.4
17.2
17.9
18.7
19.5
20.3
21.1
22.0
22.9
23.8
24.7
25.6
26.6
27.6
28.6
2.65
2.60
2.55
2.50
2.45
2.40
2.35
2.29
2.24
2.19
2.13
2.08
2.03
1.97
1.92
1.86
1.81
1.76
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
Table 1C
Table 1D
AP
Dim (cm)
Effective
Dia (cm)
Conversion
Factor
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
8.8
10.2
11.6
13.0
14.4
15.7
17.0
18.3
19.6
20.8
22.0
23.2
24.3
25.5
26.6
27.6
28.7
29.7
30.7
31.6
32.6
33.5
34.4
35.2
36.0
36.8
37.6
2.68
2.55
2.42
2.30
2.18
2.08
1.98
1.89
1.81
1.73
1.65
1.58
1.52
1.45
1.40
1.34
1.29
1.25
1.20
1.16
1.12
1.08
1.05
1.02
0.99
0.96
0.93
! "
Effective
Dia (cm)
Conversion
Factor
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
2.76
2.66
2.57
2.47
2.38
2.30
2.22
2.14
2.06
1.98
1.91
1.84
1.78
1.71
1.65
1.59
1.53
1.48
1.43
1.37
1.32
1.28
1.23
1.19
1.14
1.10
1.06
Lat+AP
Dim (cm)
Effective
Dia (cm)
Conversion
Factor
70
72
74
76
78
80
82
84
86
88
90
34.5
35.5
36.5
37.5
38.5
39.5
40.5
41.5
42.4
43.4
44.4
1.04
1.01
0.97
0.94
0.90
0.87
0.84
0.81
0.78
0.75
0.72
Lateral
Dim (cm)
Effective
Dia (cm)
Conversion
Factor
35
36
37
38
39
40
41
42
43
44
45
29.6
30.6
31.7
32.7
33.8
34.9
36.1
37.2
38.4
39.6
40.8
1.25
1.20
1.16
1.11
1.07
1.03
0.98
0.94
0.90
0.87
0.83
AP
Dim (cm)
Effective
Dia (cm)
Conversion
Factor
35
36
37
38
39
40
41
42
43
44
45
38.4
39.1
39.8
40.4
41.1
41.7
42.3
42.8
43.4
43.9
44.4
0.91
0.88
0.86
0.84
0.82
0.80
0.78
0.77
0.75
0.74
0.73
! "
Effective
Dia (cm)
Conversion
Factor
35
36
37
38
39
40
41
42
43
44
45
1.02
0.99
0.95
0.92
0.88
0.85
082
0.79
0.76
0.74
0.71
Table 2. This table provides conversion factors based on the use of the 16 cm diameter PMMA phantom for CTDIvol. Table 2A shows the
conversion factor as a function of the sum of the lateral and AP dimensions. Table 2B shows conversion factors as a function of the lateral
dimension, and Table 2C is for the AP dimension. Table 2D provides conversion factors as a function of effective diameter. It is essential that
these data be used when the CTDIvol reported is known to be based on the 16 cm diameter body dosimetry phantom.
Table 2A
Lat + AP
Dim (cm)
Effective
Dia (cm)
Conversion
Factor
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
5.7
6.2
6.7
7.2
7.7
8.2
8.7
9.2
9.7
10.2
10.7
11.2
11.7
12.2
12.7
13.2
13.7
14.2
14.7
15.2
15.7
16.2
16.7
17.2
17.6
18.1
1.50
1.47
1.44
1.42
1.39
1.36
1.34
1.31
1.29
1.26
1.24
1.22
1.19
1.17
1.15
1.13
1.10
1.08
1.06
1.04
1.02
1.00
0.98
0.97
0.95
0.93
Table 2B
Table 2C
Table 2D
Lateral
Dim (cm)
Effective
Dia (cm)
Conversion
Factor
AP
Dim (cm)
Effective
Dia (cm)
Conversion
Factor
Effective
Dia (cm)
Conversion
Factor
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
8.2
8.7
9.2
9.7
10.2
10.7
11.3
11.8
12.4
13.1
13.7
14.3
15.0
15.7
16.4
17.2
17.9
18.7
19.5
20.3
21.1
22.0
22.9
23.8
24.7
25.6
1.36
1.34
1.32
1.29
1.26
1.24
1.21
1.19
1.16
1.13
1.10
1.08
1.05
1.02
0.99
0.96
0.94
0.91
0.88
0.85
0.83
0.80
0.77
0.75
0.72
0.70
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
5.8
1.50
1.41
1.33
1.26
1.19
1.13
1.07
1.02
0.97
0.92
0.88
0.84
0.80
0.76
0.73
0.70
0.67
0.64
0.62
0.59
0.57
0.55
0.53
0.51
0.50
0.48
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
1.49
1.43
1.38
1.32
1.27
1.22
1.18
1.13
1.09
1.05
1.01
0.97
0.93
0.90
0.86
0.83
0.80
0.77
0.74
0.71
0.69
0.66
0.63
0.61
0.59
0.56
7.3
8.8
10.2
11.6
13.0
14.4
15.7
17.0
18.3
19.6
20.8
22.0
23.2
24.3
25.5
26.6
27.6
28.7
29.7
30.7
31.6
32.6
33.5
34.4
35.2
! "
Lat + AP
Dim (cm)
Effective
Dia (cm)
Conversion
Factor
38
39
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80
82
18.6
19.1
19.6
20.6
21.6
22.6
23.6
24.6
25.6
26.6
27.6
28.6
29.6
30.5
31.5
32.5
33.5
34.5
35.5
36.5
37.5
38.5
39.5
40.5
0.91
0.89
0.88
0.84
0.81
0.78
0.75
0.72
0.70
0.67
0.64
0.62
0.60
0.57
0.55
0.53
0.51
0.49
0.47
0.46
0.44
0.42
0.41
0.39
Lateral
Dim (cm)
Effective
Dia (cm)
Conversion
Factor
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
26.6
27.6
28.6
29.6
30.6
31.7
32.7
33.8
34.9
36.1
37.2
38.4
39.6
40.8
42.1
43.3
44.6
45.9
47.2
48.5
49.9
51.3
52.7
54.1
0.67
0.65
0.62
0.60
0.57
0.55
0.53
0.51
0.48
0.46
0.44
0.42
0.40
0.39
0.37
0.35
0.33
0.32
0.30
0.29
0.27
0.26
0.24
0.23
AP
Dim (cm)
Effective
Dia (cm)
Conversion
Factor
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
36.0
36.8
37.6
38.4
39.1
39.8
40.4
41.1
41.7
42.3
42.8
43.4
43.9
44.4
44.8
45.2
45.6
46.0
46.4
46.7
47.0
47.2
47.5
47.7
0.46
0.45
0.44
0.42
0.41
0.40
0.39
0.38
0.37
0.36
0.36
0.35
0.34
0.34
0.33
0.33
0.32
0.32
0.31
0.31
0.30
0.30
0.30
0.30
! "
Effective
Dia (cm)
Conversion
Factor
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
0.54
0.52
0.50
0.48
0.47
0.45
0.43
0.41
040
0.38
0.37
0.35
0.34
0.33
0.32
0.30
0.29
0.28
0.27
0.26
0.25
0.24
0.23
0.22
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