Table 2.
Modeling of the BrainLAB Imaging couch top (ICT) in the Philips Pinnacle3 treatment planning system using different combinations of carbon fibers (CF) and foam densities (F) for 10 cm × 10 cm field size
| Percentage deviation of Pinnacle3treatment planning system predicted dose to measured dose | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Angle |
Measured dose (cGy) |
No Couch |
CF0.6 |
CF0.5 |
CF0.46, |
CF0.46 |
CF0.6 |
CF0.55 |
CF0.7 |
| |
|
|
F0.02 |
F0.03 |
F0.05 |
F0.1 |
F0.1 |
F0.03 |
F0.1 |
| 180 |
89.3 |
1.31 |
-1.04 |
-0.26 |
-0.93 |
-1.82 |
-2.83 |
-0.71 |
-3.28 |
| 170 |
89.0 |
0.94 |
-0.97 |
-0.30 |
-0.97 |
-1.87 |
-2.77 |
-0.64 |
-3.33 |
| 160 |
87.9 |
1.72 |
-0.79 |
-0.10 |
-0.79 |
-1.70 |
-2.72 |
-0.44 |
-3.18 |
| 150 |
85.9 |
1.68 |
-0.30 |
0.40 |
-0.41 |
-1.46 |
-2.51 |
0.05 |
-2.86 |
| 140 |
82.4 |
2.67 |
-0.36 |
0.49 |
-0.24 |
-1.58 |
-2.79 |
0.12 |
-3.28 |
| 130 |
76.7 |
4.40 |
0.23 |
1.27 |
0.36 |
-1.21 |
-2.77 |
0.75 |
-3.42 |
| 120 |
67.5 |
7.12 |
1.05 |
2.53 |
1.19 |
-0.73 |
-2.81 |
1.79 |
-3.55 |
| 110 |
58.0 |
5.83 |
-1.06 |
0.49 |
-0.03 |
-1.23 |
-3.47 |
-0.20 |
-3.82 |
| 100 |
64.5 |
-0.96 |
-0.96 |
-0.96 |
-0.96 |
-0.96 |
-0.96 |
-0.96 |
-0.65 |
| Sum |
|
24.72 |
-4.20 |
3.56 |
-2.77 |
-12.56 |
-23.63 |
0.23 |
-27.36 |
| t-test | 0.0059 | 0.07 | 0.27 | 0.18 | 0.00007 | 0.000005 | 0.99 | 0.00002 | |
Note that the “measured dose (cGy)” is the dose measured as described in phantom dose measurement through the imaging couch top.