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Table 1 Summary of setup errors: mean, standard deviation, median and range

From: Initial results for patient setup verification using transperineal ultrasound and cone beam CT in external beam radiation therapy of prostate cancer

Dimension Mean ± STD Median Range
Lateral
 US imaging −0.4 ± 3.8 −0.3 −12.6 → 10.3
 CBCT imaging 1.1 ± 3.6 1.4 −7.3 → 12.1
 Absolute difference of US and CBCT 2.7 ± 2.3 2.5 0 → 10.3
Vertical
 US imaging 0.8 ± 4.1 1.0 −12.6 → 11.0
 CBCT imaging 0.3 ± 3.3 1.2 −12.0 → 7.7
 Absolute difference of US and CBCT 3.0 ± 2.4 2.5 0 → 11.8
Longitudinal
 US imaging −0.5 ± 4.4 −0.8 −11.9 → 11.3
 CBCT imaging 0.9 ± 3.2 0.6 −10.3 → 9.7
 Absolute difference of US and CBCT 3.2 ± 2.7 2.6 0 → 16.5
3D
 US imaging 6.0 ± 2.9 6.3 0.8 → 16.9
 CBCT imaging 5.4 ± 2.7 4.9 0.6 → 13.3
 Absolute difference of US and CBCT 6.0 ± 3.1 5.6 1.1 → 19.2
  1. In units of mm