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Table 2 Systematic and random errors for displacement of the three points of interest for the right seminal vesicle (RSV) and left seminal vesicle (LSV)

From: Seminal vesicle interfraction displacement and margins in image guided radiotherapy for prostate cancer

  Direction Whole LSV Whole LSV* (long) Inferior 2.5 cm LSV* LSV tip Whole RSV Whole RSV* (long) Inferior 2.5 cm RSV* RSV tip Whole SV† Inferior 2.5 cm SV† SV tip†
Systematic error (mm) (∑) LR 1.5 1.3 1.3 3.3 2.1 1.6 1.7 4.4 1.9 1.9 4.2
AP 2.7 3.1 2.7 3.9 3.0 3.2 3.6 4.2 2.9 2.9 4.0
SI 3.1 3.4 3.5 4.0 4.1 3.3 3.1 5.8 3.6 3.5 5.0
Random error (mm) (σ) LR 1.3 1.3 1.3 3.3 1.5 1.6 1.5 3.9 1.4 1.4 3.6
AP 2.7 2.9 2.9 4.0 2.7 2.7 2.8 4.1 2.7 2.8 4.1
SI 2.1 2.1 2.1 3.5 2.1 2.3 2.2 3.5 2.1 2.1 3.5
van Herk Margin (mm) LR 4.7 4.2 4.2   6.3 5.1 5.3   5.7 5.7  
AP 8.6 9.8 8.8   9.4 9.9 11.0   9.1 9.2  
  SI 9.2 10.0 10.2   11.7 9.9 9.3   10.5 10.2  
  1. *Data from 13 LSV or 15 RSV, as the remaining SVs were shorter than 2.5 cm on the reference scan.
  2. †Combined data for both SVs, all patients.