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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

Ī£a (mm)

1.4

1.0

1.0

0.4

0.5

0.4

Ļƒb (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.