Result: The weight, transverse diameter of the nasopharyngeal, the neck, GTV-tumor, GTV-lymph node, CTV and 2 parotid glands volume were decreased significantly at time after 20th fraction compared with before treatment (mean reduction 3.79 ± 2.29 kg, 0.77 ± 0.48 cm, 0.79 ± 0.63 cm, 6.25 ± 7.82 cm3, 12.37 ± 16.37 cm3, 38.93 ± 31.83 cm3, 5.65 ± 4.57 cm3, 6.14 ± 4.92 cm3, respectively; p=0.0001).