Skip to main content

Table 1 Target coverage and irradiated volumes

From: Dosimetric consequences of the shift towards computed tomography guided target definition and planning for breast conserving radiotherapy

  Cumulative dose plan CT-based Cumulative dose plan Conventional p-values
Target coverage (%)    
   Breast PTVCT ≥ 95% 99.2 (97.7 – 100.0) 95.3 (84.5 – 100.0) < 0.001
   Boost PTVCT ≥ 95% 99.6 (98.0 – 100.0) 90.1 (70.3 – 100.0) < 0.001
Irradiated volumes (cm3)    
   Volume ≥ 95% * 50 Gy 1276 (461 – 2239) 1142 (518 – 1968) 0.01
   Volume ≥ 95% * 66 Gy 241 (105 – 491) 187 (84 – 376) < 0.001
Excess volumes (cm3)    
   ≥ 95% * 50 Gy outside breast PTVCT 529 (257–1114) 427 (143 – 857) 0.02
   ≥ 95% * 66 Gy outside boost PTVCT 124 (65 – 260) 82 (31 – 144) < 0.001
  1. PTV: planning target volume; PTVCT: computed tomography (CT)-based PTV.
  2. Data presented as mean values, with ranges in parentheses