Table 2.

Values of V20 for total lung, and differences between control and experimental values for each of the 10 study patients, using varying combinations of regions of interest to drive the deformations in the four‐dimensional dose calculations

Patient	V20 values (%)						V20 differences (%)
	LHCE	LHC	LH	LE	LC	L	$LHC-LHCE$ $LHC-LHCE$	$LH-LHCE$ $LH-LHCE$	$LE-LHCE$	$LC-LHCE$	$L-LHCE$
1	26.26	26.34	26.37	26.46	26.58	26.62	0.08	0.11	0.20	0.32	0.36
2	21.52	22.21	22.93	22.74	23.72	27.09	0.69	1.41	1.22	2.20	5.57
3	19.93	21.11	21.06	19.12	20.70	17.98	1.19	1.13	$-0.80$	0.77	$-1.94$
4	28.91	28.88	28.86	28.90	28.85	28.77	$-0.03$	$-0.05$	$-0.01$	$-0.07$	$-0.14$
5	41.40	43.22	43.04	43.05	41.40	12.47	1.82	1.64	1.64	$-0.01$	$-28.94$
6	2.92	2.64	2.38	2.02	1.11	0.51	$-0.29$	$-0.55$	$-0.91$	$-1.82$	$-2.42$
7	32.99	33.50	34.00	33.53	34.56	36.98	0.52	1.01	0.54	1.57	3.99
8	38.10	39.24	39.72	41.28	44.73	41.96	1.14	1.63	3.18	6.63	3.86
9	36.51	37.98	37.86	36.60	38.91	38.65	1.47	1.35	0.08	2.40	2.14
10	27.89	30.48	31.35	29.95	31.89	31.76	2.59	3.46	2.06	4.00	3.87
RMS deviation							1.25	1.54	1.43	2.78	9.64
Maximum deviation							2.59	3.46	3.18	6.63	28.94

$\mathrm{V}20=\mathrm{f}\mathrm{r}\mathrm{a}\mathrm{c}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}\mathrm{a}\mathrm{l}\hspace{0.17em}\mathrm{v}\mathrm{o}\mathrm{l}\mathrm{u}\mathrm{m}\mathrm{e}\hspace{0.17em}\mathrm{o}\mathrm{f}\hspace{0.17em}\mathrm{a}\mathrm{n}\mathrm{a}\mathrm{t}\mathrm{o}\mathrm{m}\mathrm{i}\mathrm{c}\hspace{0.17em}\mathrm{s}\mathrm{t}\mathrm{r}\mathrm{u}\mathrm{c}\mathrm{t}\mathrm{u}\mathrm{r}\mathrm{e}\hspace{0.17em}\mathrm{r}\mathrm{e}\mathrm{c}\mathrm{e}\mathrm{i}\mathrm{v}\mathrm{i}\mathrm{n}\mathrm{g}\hspace{0.17em}\mathrm{a}\mathrm{t}\hspace{0.17em}\mathrm{l}\mathrm{e}\mathrm{a}\mathrm{s}\mathrm{t}\hspace{0.17em}20\hspace{0.17em}\mathrm{G}\mathrm{y}$; $\mathrm{L}\mathrm{H}\mathrm{C}\mathrm{E}=4\mathrm{D}$ dose calculation driven by deformations of lung, heart, cord, external contour; $\mathrm{L}\mathrm{H}\mathrm{C}=4\mathrm{D}$ dose calculation driven by deformations of lung, heart, cord; $\mathrm{L}\mathrm{H}=4\mathrm{D}$ dose calculation driven by deformations of lung, heart; $\mathrm{L}\mathrm{E}=4\mathrm{D}$ dose calculation driven by deformations of lung, external contour; $\mathrm{L}\mathrm{C}=4\mathrm{D}$ dose calculation driven by deformations of lung, cord; $\mathrm{L}=4\mathrm{D}$ dose calculation driven by deformations of lung; $\mathrm{R}\mathrm{M}\mathrm{S}=\mathrm{r}\mathrm{o}\mathrm{o}\mathrm{t}\hspace{0.17em}\mathrm{m}\mathrm{e}\mathrm{a}\mathrm{n}\hspace{0.17em}\mathrm{s}\mathrm{q}\mathrm{u}\mathrm{a}\mathrm{r}\mathrm{e}$; root mean square.