BioMed Research International

Research Article

A Light-Field-Based Method to Adjust On-Axis Rounded Leaf End MLC Position to Predict Off-Axis MLC Penumbra Region Dosimetric Performance in a Radiation Therapy Planning System

Table 1

This table demonstrates the derivation procedures of off-axis 50% dose position from on-axis 50% dose position of 10 MV and 6 MV photon beams at an SAD of 100 cm.
1234567891011
Nominal field size of nominal field of on-axis of on-axis γ 50,off 10 , 6 ,
−12 −0.119 −4.018 10.081 10.625 −4.235 −0.126 −12.623 0.321 −11.977 −11.797
−11 −0.109 −3.683 10.398 10.926 −3.870 −0.115 −11.535 0.312 −10.977 −10.807
−10 −0.099 −3.347 10.719 11.232 −3.508 −0.104 −10.455 0.303 −9.977 −9.808
−9 −0.090 −3.012 11.038 11.537 −3.148 −0.094 −9.383 0.295 −8.978 −8.818
−6 −0.060 −2.006 12.010 12.470 −2.082 −0.062 −6.207 0.272 −5.978 −5.830
−5 −0.050 −1.670 12.336 12.784 −1.731 −0.052 −5.159 0.266 −4.978 −4.836
−4 −0.040 −1.335 12.669 13.106 −1.381 −0.041 −4.115 0.259 −3.978 −3.826
−3 −0.030 −0.999 12.999 13.425 −1.032 −0.031 −3.076 0.253 −2.978 −2.830
−2 −0.020 −0.664 13.332 13.748 −0.684 −0.020 −2.040 0.247 −1.978 −1.826
−1 −0.010 −0.328 13.663 14.069 −0.338 −0.010 −1.007 0.241 −0.978 −0.835
0 0.000 0.007 13.995 14.391 0.007 0.000 0.022 0.235 0.022 0.156
1 0.010 0.343 14.325 14.712 0.352 0.010 1.049 0.230 1.021 1.137
2 0.020 0.678 14.662 15.041 0.696 0.021 2.074 0.225 2.021 2.135
3 0.030 1.014 14.996 15.367 1.039 0.031 3.096 0.220 3.021 3.120
4 0.040 1.349 15.333 15.696 1.381 0.041 4.116 0.215 4.021 4.109
5 0.050 1.685 15.674 16.030 1.723 0.051 5.135 0.211 5.021 5.109
6 0.060 2.020 16.016 16.364 2.064 0.061 6.152 0.206 6.021 6.103
7 0.070 2.356 16.360 16.701 2.405 0.072 7.167 0.202 7.021 7.103
8 0.080 2.691 16.703 17.036 2.745 0.082 8.181 0.198 8.021 8.092
9 0.090 3.026 17.050 17.377 3.085 0.092 9.194 0.194 9.021 9.091
10 0.100 3.362 17.395 17.716 3.424 0.102 10.205 0.191 10.021 10.081
11 0.110 3.697 17.745 18.060 3.763 0.112 11.216 0.187 11.021 11.080
12 0.120 4.033 18.093 18.401 4.102 0.122 12.226 0.183 12.021 12.070
13 0.129 4.368 18.446 18.748 4.440 0.132 13.234 0.180 13.021 13.069
14 0.139 4.704 18.796 19.093 4.778 0.141 14.242 0.177 14.021 14.059
15 0.149 5.039 19.152 19.443 5.116 0.151 15.249 0.173 15.021 15.058
16 0.159 5.375 19.505 19.791 5.454 0.161 16.256 0.170 16.020 16.048
17 0.169 5.710 19.863 20.144 5.791 0.171 17.262 0.167 17.020 17.047
18 0.178 6.046 20.219 20.495 6.129 0.181 18.267 0.164 18.020 18.037
19 0.188 6.381 20.579 20.851 6.466 0.190 19.271 0.162 19.020 19.036
20 0.198 6.717 20.938 21.205 6.802 0.200 20.276 0.159 20.020 20.025