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Table 4 Residual errors (mm) of the upper vertebrae and clavicula (in parenthesis) when the orthogonal setup images are matched to different positions

From: Determination of the optimal matching position for setup images and minimal setup margins in adjuvant radiotherapy of breast and lymph nodes treated in voluntary deep inhalation breath-hold

  Systematic error Σ Random error σ Margins in mm
Matching position LAT direction SI direction LAT direction SI direction LAT direction SI direction
MID_V 1.3 (2.5) 1.1 (2.3) 1.3 (2.2) 1.8 (3.1) 4.2 (7.8) 4.0 (7.9)
MID_R+UPPER _ST 1.9 (2.3) 3.0 (2.3) 1.3 (2.1) 2.3 (2.2) 5.7 (7.2) 9.1 (7.3)
MID_V+UPPER_ST 1.3 (2.5) 2.5 (2.4) 1.3 (2.2) 1.8 (2.4) 4.2 (7.8) 7.5 (7.7)
MID_V+MID_R 1.5 (2.3) 1.4 (2.0) 1.2 (2.0) 1.5 (2.3) 4.6 (7.2) 4.6 (6.6)
MID_V+UPPER_ST+MID_R 1.5 (2.3) 2.2 (2.0) 1.2 (2.0) 1.9 (2.2) 4.6 (7.2) 6.8 (6.5)
UPPER_ST - 4.5 (3.4) - 3.0 (3.0) - 13.4 (10.6)
MID_R - 2.4 (2.3) - 2.4 (2.3) - 7.7 (7.4)
Online match to optimal position1 1.7 (2.4) 3.5 (2.9) 1.4 (2.2) 2.9 (2.9) 5.3 (7.5) 10.8 (9.2)
  1. 1includes interobserver variation in image matching.