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Table 2 Population setup errors

From: Setup errors in patients with head-neck cancer (HNC), treated using the Intensity Modulated Radiation Therapy (IMRT) technique: how it influences the customised immobilisation systems, patient’s pain and anxiety

  

Tomotherapy

  

M

Σ

σ

All patients

  
 

Mediolateral

−0.4

3.1

2.2

 

Craniocaudal

2.0

1.6

1.7

 

Anteroposteriora

0.8

1.3

1.7

Main sites:

  

 Nasopharynx

    
 

Mediolateral

1.5

2.8

2.6

 

Craniocaudal

1.2

1.1

2.5

 

Anteroposteriora

0.7

1.8

1.5

 Oropharynx

    
 

Mediolateral

−1.6

2.9

2.5

 

Craniocaudal

1.8

1.4

1.6

 

Anteroposteriora

0.7

1.4

1.9

 Hypopharynx

    
 

Mediolateral

−0.3

3.4

1.7

 

Craniocaudal

2.6

1.7

1.6

 

Anteroposteriora

1.1

0.9

1.3

 Oral cavity

    
 

Mediolateral

1.2

1.5

1.4

 

Craniocaudal

2.0

1.4

1.3

 

Anteroposteriora

0.5

1.2

1.6

 Other

    
 

Mediolateral

2.0

3.3

1.9

 

Craniocaudal

4.6

3.0

1.5

 

Anteroposteriora

1.7

1.5

1.3

  1. aAntero-Posterior correction of 3.8 mm is applied for the systematic AP setup error caused by couch sag