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Table 1 Residual errors (mm) of the distances between the landmarks caused by variations in breath-hold level and non-rigid patient anatomy

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

Landmarks and the investigated images Clinical importance Systematic error Σ Random error σ
AP SI LAT AP SI LAT
UPPER_ST-MID_V Breath-hold level and rotation about LAT axis 3.4 5.0 - 2.5 3.3 -
(LAT image)
MID_V-MID_R Breath-hold movements and rotation about AP axis - 3.6 1.3 - 3.0 1.3
(AP image)
MID_R-UPPER_ST Deformation caused by breath-hold - 3.8 - - 2.6 -
(AP+LAT image)
UPPER_V-LOWER_V Rotation about AP and LAT axes 1.4 0.8 2.2 1.4 1.2 1.9
(AP+LAT image)
UPPER_ST-LOWER_ST Non-rigidity and rotation of the sternum 1.7 0.9 - 1.3 1.1 -