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Table 1 Overall mean of the discrepancy between the final and automatic alignment, setup uncertainty, and PTV margins calculated

From: Assessment of setup uncertainty in hypofractionated liver radiation therapy with a breath-hold technique using automatic image registration–based image guidance

  All patients
(69 patients, 917 fractions)
No OAR near target
(30 patients, 389 fractions)
OAR near target
(39 patients, 528 fractions)
AP (mm) LR (mm) SI (mm) AP (mm) LR (mm) SI (mm) AP (mm) LR (mm) SI (mm)
Mean, M −0.3 0.1 0.4 −0.3 0.1 0.3 −0.3 0.3 0.5
Systematic uncertainty, ∑ 1.5 1.1 2.4 1.6 0.9 1.5 1.5 1.2 2.9
Random uncertainty, σ 2.2 1.9 2.2 1.9 1.7 2.0 2.4 2.0 2.4
PTV margin 5.3 4.1 7.5 5.3 3.5 5.1 5.3 4.5 8.9
  1. PTV planning target volume, OAR organ-at-risk, AP anterior-posterior, LR left-right, SI superior-inferior