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Table 2 The residual errors (mm) of the chest wall and the breast surface (in parenthesis) after different alignments of the orthogonal kV setup images

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
Objects AP/LAT direction SI direction AP/LAT direction SI direction AP/LAT direction SI direction
Laser setup 3.5 (4.3) 4.5 (5.1) 3.6 (3.8) 4.5 (4.5) 11.3 (13.4) 14.4 (15.9)
MID_V 2.9 (3.4) 4.2 (5.5) 2.3 (2.6) 3.5 (4.1) 8.9 (10.3) 13.0 (16.6)
MID_R+UPPER_ST 1.5 (2.6) 1.9 (3.2) 2.2 (2.4) 2.6 (3.0) 5.3 (8.2) 6.6 (10.1)
MID_V+UPPER_ST 1.8 (2.9) 2.3 (3.9) 2.1 (2.4) 2.7 (3.3) 6.0 (8.9) 7.6 (12.1)
MID_V+MID_R 2.9 (3.4) 3.1 (4.4) 2.2 (2.5) 2.8 (3.3) 8.8 (10.3) 9.7 (13.3)
MID_V+UPPER_ST+MID_R 2.2 (3.1) 2.2 (3.7) 2.4 (2.3) 2.6 (3.0) 7.2 (9.4) 7.3 (11.4)
UPPER_ST - 2.3 (3.5) - 2.9 (3.3) - 7.8 (11.1)
MID_R - 2.8 (3.8) - 3.0 (3.3) - 9.1 (11.8)
Online match to optimal position1 1.3 (2.6) 1.8 (3.1) 2.1 (2.4) 2.2 (3.1) 4.8 (8.2) 6.0 (9.9)
  1. 1includes interobserver variation in image matching.