Table 3.

Evaluation of ${\mathrm{D}}_{2\text{cm}}$ 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	${\mathrm{D}}_{2\text{cm}}$ XVMC
1	11.1	50.0‐58.0	52.2 a
2	20.1	53.0‐61.9	60.8 a
3	27.1	55.7‐65.0	57.8 a
4	50.9	62.2‐77.5	59.4
5	68.1	65.6‐85.1	76.3 a
6	12.9	50.0‐58.0	49.1
7	15.0	50.9‐59.1	59.0 a
8	20.1	53.1‐61.9	61.9 a
9	21.0	53.6‐62.4	52.5
10	26.3	55.3‐64.7	52.7
11	31.2	57.0‐66.8	56.2
12	36.2	58.5‐69.1	69.1 a
13	37.1	58.8‐69.7	57.5
14	39.7	59.3‐70.8	64.9 a
15	39.8	59.3‐70.8	53.6
16	53.4	62.6‐78.4	67.4 a
17	56.5	63.4‐80.2	75.5 a
18	61.5	64.4‐82.4	64.2
19	132.0	73.7‐91.5	74.9 a
20	163.0	77.0‐94.0	73.4
AVG	46.1		61.9
STDEV	38.7		8.5

^aData that have minor deviations from RTOG 0915 criteria.

PTV = planning target volume; ${\mathrm{D}}_{2\text{cm}}=\hspace{0.17em}\text{maximal dose}2\text{cm}$ from PTV in any direction as a percentage of prescription dose; AVG = average; STDEV = standard deviation.