1189 / 1542
Example
Palliative case treating a field of 8*8 cm to 20Gy in 4#
Prescription point 5cm depth.
Patient to be treated at 100SSD
=591.7
Basic Dose Caculation
Principles 2012
35
“Willow” 6MV PDD* Output
Depth
Equivalent Square Field Size (cm)
(cm)
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5 10
Dmax (1.5) 93.6 94.5 95.4 95.7 95.9 96.6 97.3 97.7 98.2 98.5 98.8 99.4 100.0
2.0
92.7 93.7 94.7 94.8 94.8 95.5 96.1 96.6 97.1 97.4 97.7 98.3 99.0
2.5
90.5 91.5 92.6 92.8 93.0 93.5 94.1 94.6 95.1 95.4 95.8 96.3 96.9
3.0
88.0 89.1 90.1 90.4 90.7 91.2 91.8 92.3 92.8 93.2 93.6 94.3 95.0
3.5
85.8 86.9 88.0 88.3 88.7 89.2 89.8 90.3 90.8 91.2 91.6 92.1 92.6
4.0
83.7 84.7 85.7 86.0 86.3 87.0 87.7 88.2 88.6 89.1 89.5 90.2 90.8
4.5
81.3 82.2 83.1 83.6 84.2 84.9 85.6 86.1 86.5 87.0 87.4 88.0 88.6
5.0
79.1 80.0 80.8 81.5 82.2 82.8 83.4 84.0 84.5 84.9 85.4 86.0 86.7
5.5
76.7 77.9 79.0 79.3 79.6 80.5 81.3 81.9 82.4 82.8 83.3 84.0 84.7
6.0
74.7 75.6 76.5 77.2 77.8 78.5 79.1 79.7 80.3 80.9 81.6 82.1 82.5
6.5
72.5 73.6 74.7 75.2 75.7 76.6 77.4 77.9 78.4 78.8 79.2 79.9 80.5
7.0
70.5 71.5 72.5 73.1 73.7 74.4 75.1 75.8 76.4 76.9 77.3 77.8 78.4
7.5
68.3 69.5 70.7 71.2 71.6 72.4 73.2 73.8 74.3 74.8 75.3 76.1 76.8
8.0
66.4 67.5 68.5 69.2 69.8 70.5 71.2 71.9 72.6 72.9 73.3 74.1 74.8
8.5
64.5 65.6 66.6 67.3 67.9 68.6 69.3 70.0 70.7 71.1 71.5 72.2 72.9
9.0
62.5 63.6 64.8 65.4 66.1 66.7 67.4 68.1 68.7 69.1 69.5 70.3 71.1
9.5
60.8 61.9 63.0 63.5 64.1 64.8 65.5 66.2 66.9 67.5 68.0 68.6 69.2
10.0
58.8 59.9 61.1 61.7 62.3 63.1 63.8 64.5 65.1 65.6 66.1 66.8 67.5
10.5
57.1 58.3 59.5 60.0 60.4 61.2 62.1 62.7 63.2 63.8 64.4 65.0 65.6
11.0
55.5 56.6 57.7 58.2 58.7 59.5 60.4 61.0 61.6 62.2 62.8 63.4 64.0
11.5
53.9 55.0 56.0 56.5 57.1 57.9 58.8 59.4 60.1 60.6 61.1 61.6 62.2
12.0
52.3 53.4 54.4 55.0 55.6 56.3 57.1 57.7 58.4 58.9 59.4 60.1 60.8