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Table 3 Safety margins attributed to interfractional prostate motion (see Table 1) calculated with the van Herk formula (margin = 2.5 ∑ + 0.7 σ)

From: Appropriate patient instructions can reduce prostate motion

Reference Margin [mm] LR Margin [mm] SI Margin [mm] AP
Current study Interfraction motion 1.8 4.7 4.0
van Herk 2004 [8] Interfraction motion 2.9 5.4 8.6
Soete et al 2007 [13] Interfraction motion 4.4 12.1 12.7
Tanyi et al 2010 [14] Interfraction motion 1.6 8.9 10.2
Tanyi et al 2010 Residual error 2.5 2.6 2.3
Tanyi et al 2010 Intrafraction motion 2.8 3.7 3.2
  1. LR = left-right, SI = superior-inferior, AP = anterior-posterior.
  2. The results of the current study are compared with other published data (Σ = systematic error, σ = ramdom error).