| | |
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.
