Table 4.

Accuracy of RT structures after DIR (lung).

Algorithm: Diffeomorphic Demons
Anatomy	Dice Similarity Coefficient	Hausdorff Distance (mm)	Average Surface Distance (mm)
PTV	0.83	8.8	1.4
Cord	0.95	4.6	0.2
Heart	0.37	56.7	11.8
Lung	0.99	17.7	0.4
Bronchial Tree	0.49	18	4.2
Trachea	0.91	15	1.3
Vertebral Body	0.92	10.3	0.2
Mean Value	0.78	19.3	2.8

Algorithm: B‐spline
Anatomy	Dice Similarity Coefficient	Hausdorff Distance (mm)	Average Surface Distance (mm)
PTV	0.88	6.9	2.1
Cord	0.94	8.3	0.3
Heart	0.99	4.1	0.2
Lung	0.99	6.3	0.3
Bronchial Tree	0.96	1.4	0.1
Trachea	0.97	1.4	0.2
Vertebral Body	0.93	10.3	0.2
Mean Value	0.95	5.5	0.4