Table 1.

Evaluation of R100% in SBRT lung plans calculated by iPlan XVMC algorithm. First 5 patients had dose delivery schema of total 54 Gy in 3 fractions, and remaining 15 patients with 50 Gy in 5 fractions.

Patient No.	PTV Vol. (cc)	RTOG 0915 Minor Deviation	R100% XVMC
1	11.1	1.2‐1.5	1.19
2	20.1	1.2‐1.5	1.32 a
3	27.1	1.2‐1.5	1.20
4	50.9	1.2‐1.5	1.13
5	68.1	1.2‐1.5	1.31 a
6	12.9	1.2‐1.5	1.08
7	15.0	1.2‐1.5	1.34 a
8	20.1	1.2‐1.5	1.31 a
9	21.0	1.2‐1.5	1.28 a
10	26.3	1.2‐1.5	1.20
11	31.2	1.2‐1.5	1.20
12	36.2	1.2‐1.5	1.42 a
13	37.1	1.2‐1.5	1.32 a
14	39.7	1.2‐1.5	1.25 a
15	39.8	1.2‐1.5	1.12
16	53.4	1.2‐1.5	1.30 a
17	56.5	1.2‐1.5	1.37 a
18	61.5	1.2‐1.5	1.19
19	132.0	1.2‐1.5	1.20
20	163.0	1.2‐1.5	1.17
AVG	46.1		1.25
STDEV	38.7		0.09

^aData that have minor deviations from RTOG 0915 criteria.

PTV = planning target volume; R100% = ratio of prescription isodose volume to PTV; AVG = average; STDEV = standard deviation.