Actual Anatomical and Dosimetric Changes of Parotid Glands in Nasopharyngeal Carcinoma Patients during Intensity Modulated Radiation Therapy
Table 2
Planning dosimetric parameters of targets and organs at risk.
Parameter
Average
Standard deviation
PTV1 (Gy)
60.56
0.71
PTV2 (Gy)
56.12
1.35
pGTVnx (Gy)
70.76
1.09
pGTVnd (Gy)
70.76
0.671
Left parotid
Volume (cm3)
29.67
11.55
(Gy)
31.28
4.63
(%)
40.47
8.83
Right parotid
Volume (cm3)
30.33
6.54
(Gy)
30.72
4.39
(%)
38.87
8.95
Brainstem (Gy)
53.36
8.76
Left lens
3.94
1.11
Right lens
4.17
1.34
Left optic nerve
33.65
17.48
Right optic nerve
36.1
19.61
Left temporomandibular joint
57.28
7.96
Right temporomandibular joint
56.35
11.56
Left inner ear
63.99
5.05
Right inner ear
63.83
4.76
Oral cavity
32.49
7.31
Larynx-esophagus-trachea
35.02
12.93
: dose delivered to 95% of the target volume; : mean dose; : maximum dose; : the relative volume of the organ receiving 30 Gy; : the relative volume of the organ receiving 40 Gy.
