Table 3. Changes in gamma passing rates of the failed cases by simulating setup errors.

		Gamma passing rate with 2%/1 mm (%)
Couch rotation	–0.2°	–0.1°	0.1°	0.2°
T-spine	84.6	84.6	84.6	84.6
Lung	89.4	89.5	87.2	87.2
L-spine	87.3	87.9	87.8	87.5
C-spine	88.6	88.6	88.4	88.9
SI shift	–0.2 cm	–0.1 cm	0.1 cm	0.2 cm
T-spine	83.0	84.6	84.6	84.6
Lung	82.2	89.0	89.0	85.5
L-spine	88.4	87.5	87.5	86.0
C-spine	88.0	88.7	88.7	86.2
LR shift	–0.2 cm	–0.1 cm	0.1 cm	0.2 cm
T-spine	82.7	84.6	84.6	84.1
Lung	97.5	100	87.6	85.5
L-spine	90.4	91.6	87.5	85.5
C-spine	85.5	88.7	88.7	86.0
AP shift	–0.2 cm	–0.1 cm	0.1 cm	0.2 cm
T-spine	73.1	79.2	57.6	24.3
Lung	64.0	73.3	55.6	54.5
L-spine	82.6	86.2	85.6	81.4
C-spine	81.7	84.7	94.2	93.2

Abbreviations: SI, superior to inferior direction; LR, left to right direction; AP, anterior to posterior direction

Note: The gamma passing rates higher than 90% are shown in italic.