TABLE I.

Quantitative metrics obtained from projection images of a virtual patient with and without pleural invasion.

	Oblique view			PA view
	Invasion (+) (n = 6)	Invasion (−) (n = 12)	P-value	Invasion (+) (n = 6)	Invasion (−) (n = 12)	P-value
(i) Ratio of the maximum displacement (D1/D2)	1.16 ± 0.25	3.48 ± 3.46	<0.01	1.19 ± 0.29	4.73 ± 4.10	<0.01
(ii) Cross-correlation coefficient (r)	0.92 ± 0.07	0.82 ± 0.12	<0.01	0.91 ± 0.03	0.75 ± 0.10	<0.01
(iii) Ratio of the total moved distances (T1/T2)	1.16 ± 0.25	3.51 ± 3.44	<0.01	1.19 ± 0.29	4.85 ± 4.26	<0.01
(iv) Cosine similarity between inspiratory andexpiratory vectors	0.99 ± 0.02	0.96 ± 0.05	<0.01	1.00 ± 0.00	0.97 ± 0.04	<0.05
(v) Cosine similarity between vectors of the cancer and the reference	0.98 ± 0.03	0.87 ± 0.15	<0.05	0.98 ± 0.03	0.88 ± 0.14	<0.05

Abbreviation: PA, posteroanterior.