Table 2 Technical characteristics of RapidArc and conventional plans
RA | 3DC | |
|---|---|---|
Number of arcs or fields | 1 (25/25) | 3 (15/20), 4 (5/20) |
Arc length [°] | 358 ± 0.0 | NA |
Beam energy | 6 MV (25/25) | 6 MV (7/20) 15 MV (13/20) |
Beam on time [min] | 1.24 ± 0.0 | 0.98 ± 0.2 |
Treatment Time [min] | 2.05 ± 0.09 | 3.42 ± 0.25 |
MU | 276 ± 32 | 293 ± 46 |
MU/Gy | 141 ± 14 | 149 ± 21 |
MU/deg | 0.8 ± 0.1 | NA |
Dose Rate [MU/min] | 222 ± 25 | 300 |
Gantry speed [deg/sec] | 4.8 ± 0.0 | NA |
Collimator angle [°] | 24 ± 8 | 0 ± 0 |
Mean CP area [cm 2 ] | 156 ± 28 | NA |
Mean field area [cm 2 ] | 393 ± 75 | 249 ± 32 |
GAI [%] | 98.33 ± 1.17 | NA |