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Table 1 Setup error, motion error and total error

From: Potentials of on-line repositioning based on implanted fiducial markers and electronic portal imaging in prostate cancer radiotherapy

  Mean ± SD [mm] i = 1,..., 8; j = 1,..., 23 Range [mm]
Setup error Δs ij   
Left-right 0.8 ± 2.8 -8/10
Superior-inferior 0.1 ± 3.4 -9/14
Anterior-posterior -1.2 ± 3.6 -15/9
Prostate movement Δm ij   
Left-right -0.3 ± 1.8 -6/9
Superior-inferior 0.9 ± 2.8 -9/8
Anterior-posterior 0.3 ± 3.5 -10/10
Total error Δtot ij   
Left-right 0.5 ± 3.5 -10/19
Superior-inferior 0.9 ± 4.4 -14/13
Anterior-posterior -0.8 ± 4.9 -19/14
  1. Measured deviations for all 184 (= 23 × 8) portal imaging controls (averaged over i = 1,..., 8 weekly portal images in j = 1,..., 23 patients). Mean values <...> in all three directions (left-right LR, superior-inferior SI, anterior-posterior AP) ± standard deviations SD and ranges, i.e. extremal deviations in ± orientations of the axes, in LR, SI and AP direction for setup error <Δsij>, prostate movement <Δmij> and total errror <Δtotij> are listed (see Fig. 2 for explanation of symbols).