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Table 2 Pre-correction and post-correction systematic setup uncertainty, random setup uncertainty, and planning target volume (PTV) margins in three-dimensional directions

From: Dosimetric benefit to organs at risk following margin reductions in nasopharyngeal carcinoma treated with intensity-modulated radiation therapy

Variable Pre-correction Post-correction
ML SI AP ML SI AP
Σa (mm) 1.4 1.0 1.0 0.4 0.5 0.4
σb (mm) 0.8 0.8 0.7 0.6 0.7 0.7
PTV (mm) 4.0 3.1 3.1 1.5 1.7 1.6
  1. aSystematic setup uncertainty. bRandom setup uncertainty. ML, medial-lateral; SI, superior-inferior; AP, anterior-posterior.