Skip to main content
. 2013 Jan 31;8:26. doi: 10.1186/1748-717X-8-26

Table 4.

Plan parameters stratified by institute

    Institute Technique A B C D E
PTVboost
CI95
VMAT
1.39
1.35
1.31
1.43
1.38
IMRT
1.43
1.42
1.37
1.55
1.47
PTVtotal
CI95
VMAT
1.51
1.49
1.54
1.45
1.51
IMRT
1.58
1.63
1.70
1.55
1.65
Spinal cord
D1% (Gy)
VMAT
39.1
45.6
47.7
41.1
43.8
IMRT
39.7
46.7
48.0
42.0
45.5
Brain stem
D1% (Gy)
VMAT
44.1
45.6
49.4
35.4
44.6
IMRT
42.9
45.8
46.9
40.0
44.4
Parotid gland ipsilateral
Dmean (Gy)
VMAT
27.6
26.6
33.3
23.2
29.3
IMRT
28.5
28.4
34.2
25.3
39.0
Parotid gland contralateral
Dmean (Gy)
VMAT
23.9
21.1
23.4
20.6
20.8
IMRT
24.8
22.7
23.6
21.5
23.6
Submandibular gland contralateral
Dmean (Gy)
VMAT
49.4
58.0
57.4
47.5
52.6
IMRT
49.1
58.6
58.1
51.1
54.3
Oral cavity
Dmean (Gy)
VMAT
40.0
35.2
41.6
30.7
36.0
IMRT
42.5
40.2
43.6
33.5
37.4
Larynx
Dmean (Gy)
VMAT
51.4
44.5
49.4
43.5
38.6
IMRT
51.5
46.3
49.1
44.5
40.9
Pharyngeal constrictors°
Dmean (Gy)
VMAT
52.0
45.0
49.8
43.9
44.7
IMRT
49.0
45.7
48.8
44.2
46.6
Mandible°
Dmean (Gy)
VMAT
48.8
48.0
50.5
47.6
48.0
IMRT
49.7
49.9
51.1
49.3
51.3
Effective delivery time
(min:sec)
VMAT
4:51
6:50
--
5:15
6:41
IMRT
11:47
12:08
--
15:04
14:00
MUs
--
VMAT
600
602
540
774
698
    IMRT 830 670 824 841 975

Pairs in bold denote statistically significant differences between VMAT and IMRT.

Pairs in italic denote that the averaged plan parameter is better for IMRT.

° Not all institutes used objectives to control dose for these structures.