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Table 3 PTV volumes and dimensions

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

  CT-based target definition Conventional target definition p-values
Absolute volumes (cm3)    
   Breast PTV 753 (209 – 1548) - -
   Boost PTV 117 (40 – 243) - -
Breast PTV CT beyond conventional field borders (cm)    
   Medial 0.03 (-1.5 – 1.1)   ns
   Lateral 0.37 (-1.1 – 1.2)   0.01
Dimensions boost fields and PTVs (cm)    
   Field length 7.9 (5.4 – 10.4) 6.7 (4.5 – 8.5) < 0.001
PTVCT extending beyond PTVCON    
   right 0.18 (-0.6 – 1.2)   0.03
   left 0.36 (-0.4 – 1.7)   0.01
   ventral 0.22 (-1.7 – 1.7)   ns
   dorsal 0.23 (-0.7 – 2.5)   ns
  1. PTV: planning target volume; PTVCT: computed tomography (CT)-based PTV; PTVCON: conventional PTV. Data presented as mean values, with ranges in parentheses.