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Table 3 Summary of delivery parameters and pre-treatment dosimetric tests

From: Simultaneous integrated boost radiotherapy for bilateral breast: a treatment planning and dosimetric comparison for volumetric modulated arc and fixed field intensity modulated therapy

Delivery parameters
2 Gy/fraction RapidArc IMRT  
Monitor Units (MU) 796 ± 121 1398 ± 301 p < 0.01
MeanDose Rate (MU/min) 378 ± 46 600 fixed -
Mean MU/ ° 1.1 ± 0.2 - -
Beam on time (min) 2.30 ± 0.01 2.23 ± 0.40 p = 0.14
Treatment time (min) 3.00 ± 0.08 11.45 ± 2.05 p < 0.01
Pre-treatment Quality Assurance
  RapidArc IMRT  
  GLAaS PTW729 GLAaS PTW729  
GAI (3% 3 mm) (%) 98.8 ± 1.3 a 98.8 ± 1.3 a 99.1 ± 1.5 a 99.5 ± 1.3 a  
GAI (2% 3 mm) (%) 97.0 ± 2.8 a 97.0 ± 2.8 a 97.2 ± 4.3 a 98.4 ± 3.0 a  
GAI (2% 2 mm) (%) 93.0 ± 5.0 93.0 ± 5.0 94.4 ± 4.3 96.3 ± 4.3  
  1. Data are reported as mean ± 1 standard deviation computed over the cohort of 10 patients.
  2. GAI is the Gamma Agreement Index, percentage of field area of percentage of measured points fulfilling the criteria γ <1.
  3. * p < 0.05; ** p < 0.01; a p < 0.05 w.r.t. GAI = 95%