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Table 2 Technical characteristics of RapidArc and conventional plans

From: Neo-adjuvant chemo-radiation of rectal cancer with Volumetric Modulated Arc Therapy: summary of technical and dosimetric features and early clinical experience

  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
  1. MU: monitor units, CP: control point