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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