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

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

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

ISSN: 1748-717X