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Table 1 Patient set-up error (mm) for each scenario in three dimensions

From: Impact of the frequency of online verifications on the patient set-up accuracy and set-up margins

  

Direction

  

AP

Lateral

SI

Anatomical region

FOV

M

Σ

σ

M

Σ

σ

M

Σ

σ

Head and Neck

0%

0.3

0.9

1.6

-0.3

1.3

1.6

0.6

1.5

2.2

Chest

0%

0.7

2.4

2.7

-0.3

2.2

2.7

0.5

1.7

2.4

Abdomen

0%

0.6

3.0

3.3

-0.9

2.4

3.0

-0.8

3.6

3.1

Pelvis

0%

0.9

2.3

3.2

-0.3

1.8

2.7

1.0

3.2

2.5

Head and Neck

20%

0.2

0.8

1.4

-0.3

1.1

1.4

0.4

1.1

1.9

Chest

20%

0.5

1.7

2.2

-0.3

1.7

2.4

0.3

1.4

2.1

Abdomen

20%

0.6

2.3

3.1

-0.5

1.6

2.7

-0.4

2.6

3.0

Pelvis

20%

0.6

1.7

2.9

-0.4

1.5

2.4

0.9

2.6

2.3

Head and Neck

50%

0.1

0.5

1.1

-0.1

0.6

1.2

0.2

0.6

1.3

Chest

50%

0.3

0.9

1.6

-0.2

1.1

2.0

0.2

0.8

1.6

Abdomen

50%

0.4

1.5

2.5

-0.2

1.1

2.5

-0.4

1.7

2.8

Pelvis

50%

0.5

1.3

2.4

-0.2

1.1

1.9

0.6

1.4

2.0

  1. Abbreviations: M = Overall population mean set-up error; Σ = Population systematic error; σ = Population random error; AP = anteroposterior; SI = superoinferior; FOV = Frequency of online verifications; 0% = No online verification; 20% = Online verification once a week; 50% = Online verification every other day.