From: Feasibility of image-guided radiotherapy based on helical tomotherapy to reduce contralateral parotid dose in head and neck cancer
Site
Spinal cord
Mandibular
Study
Control
p value
Oropharynx
35.2
39.3
0.1
39.2
44.9
0.4
Oral cavity
33.6
36.9
55.4
57.2
Larynx and hypopharynx
34.2
36.1
0.5
30
31.8
0.8