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Table 1 Population systematic and random errors and necessary CTV to PTV margins

From: Assessment of three-dimensional set-up errors in conventional head and neck radiotherapy using electronic portal imaging device

Population set-up errors

CTV to PTV margins (mm)

Direction

Systematic (Σ)

Random (σ)

ICRU 62 (Sqrt Σ2+σ2)

Stroom (2 Σ + 0.7σ)

van Herk (2.5 Σ + 0.7σ)

Antero-Posterior (AP)

0.96

1.94

2.16

3.28

3.76

Medio-Lateral (ML)

0.98

1.97

2.20

3.34

3.83

Supero-Inferior (SI)

1.20

2.48

2.76

4.14

4.74

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Radiation Oncology

ISSN: 1748-717X

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