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Table 4 Differences of DVH parameters: Comparison of the distributions of DVH parameter resulting from three different IGRT correction strategies (each fraction of all patients contributes equally)

From: The frequency of re-planning and its variability dependent on the modification of the re-planning criteria and IGRT correction strategy in head and neck IMRT

  RIR_box_large: Δto plan[%] RIR_box_small: Δ[%] DIR_fit: Δ[%] p-value
  [−max, 25%, 50%, 75% + max] [−max, 25%, 50%, 75%, + max] [−max, 25%, 50%, 75%, + max]  
SC D2 [−3.2, −0.6, 0.5, 1.7, 5.4] [−4.6, −0.5, 0.7, 1.7, 5.8] [−4.1, −0.7, 0.3, 1.5, 4.1] 0.29
tCTV D95 [−7.3, 0.0, 0.5, 1.1, 2.7] [−7.1, −0.2, 0.5, 1.1, 2.9] [−7.3, −0.3, 0.3, 0.9, 2.1] <0.01
pCTV D95 [−3.3, 0.0, 0.6, 1.2, 2.7] [−3.5, −0.6, 0.3, 1.0, 3.0] [−3.6, −0.4, 0.6, 1.3, 2.9] 0.01
  1. Abbreviations: SC = spinal cord; tCTV = therapeutic CTV; pCTV = prophylactic CTV; RIR = rigid image registration; DIR = deformable image registration; Δ = deviation from the planned corresponding value.
  2. Distribution scheme: [max negative deviation; lower quartile(25%); median(50%); upper quartile(75%); max positive deviation].