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Table 1 Error components for the presented setup correction protocol in different directions (mm)

From: Estimation of adequate setup margins and threshold for position errors requiring immediate attention in head and neck cancer radiotherapy based on 2D image guidance

Structure

Systematic error Σ (1 SD)

Random error σ (1 SD)

AP/ vertical

CC/ longitudinal

LAT/ lateral

AP/ vertical

CC/ longitudinal

LAT/ lateral

Rigid target1

0.8 (1.1)

0.9 (1.3)

0.7 (0.7)

1.7 (1.3)

1.6 (1.6)

1.6 (1.2)

Observer variation

0.9 (1.0)

0.8 (1.0)

0.9 (0.9)

1.4 (1.4)

1.5 (1.6)

1.6 (1.6)

C1-22

2.0 (1.6)

1.0 (1.4)

1.6 (1.3)

1.8 (1.4)

1.3 (1.6)

1.6 (1.5)

C5-72

1.5 (1.8)

1.0 (1.5)

1.2 (1.2)

1.4 (1.6)

1.8 (1.9)

1.7 (1.6)

Mandible2

2.9 (1.5)

2.7 (1.5)

1.6 (1.3)

2.3 (1.7)

2.4 (1.9)

1.9 (1.6)

Occiput bone2

2.4 (2.2)

1.5 (2.0)

-

2.3 (1.9)

1.9 (1.7)

-

  1. 1Errors of the reference location for weekly IGRT without observer related variation.
  2. 2Errors with daily imaging including observer errors.
  3. The results are given for the two matching principles as MID_PTV (MIN_MAX).
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Radiation Oncology

ISSN: 1748-717X

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