[Retracted] Dosimetric Comparison between Volumetric Modulated Arc Therapy (VMAT) and Intensity-Modulated Radiotherapy (IMRT) for Dental Structures of Head and Neck Cancer Patients

Figure 1

Radiation doses delivered by IMRT and VMAT to the overall dental structures. N independent-samples t-test or one-way ANOVA was used to compare radiation doses (). (a) The dental structure of patients with laryngeal cancer undergoing IMRT received lower radiation doses than other patients, and statistical significance was achieved with the mean of maximum doses. Mean of average doses: nasopharynx: 34.53 ± 3.01 Gy, oral cavity: 35.79 ± 11.39 Gy, oropharynx: 29.27 ± 10.88 Gy, and larynx: 25.08 ± 6.86 Gy. Mean of maximum doses: nasopharynx: 66.99 ± 6.72 Gy, oral cavity: 63.87 ± 9.17 Gy, oropharynx: 61.72 ± 9.27 Gy, and larynx: 45.77 ± 11.41 Gy. (b) The mean of average radiation doses delivered by VMAT to patients with oral cavity cancers was significantly higher than other patients. In addition, the dental structures of patients with laryngeal cancers received significantly lower radiation doses than other patients. Mean of average doses: nasopharynx: 34.25 ± 5.24 Gy, oral cavity: 43.02 ± 10.79 Gy, oropharynx: 30.20 ± 11.78 Gy, and larynx: 23.57 ± 6.30 Gy. Mean of maximum doses: nasopharynx: 63.62 ± 7.82 Gy, oral cavity: 65.47 ± 10.72 Gy, oropharynx: 61.72 ± 9.27 Gy, and larynx: 46.69 ± 10.76 Gy. (c) There were no significant differences in the overall dental doses between IMRT and VMAT. Mean of average doses: IMRT: 30.93 ± 9.49 Gy; VMAT: 32.84 ± 11.14 Gy. Mean of maximum doses: IMRT: 59.47 ± 12.32 Gy; VMAT: 59.61 ± 12.31 Gy. (d) Patients affected by oral cavity cancers treated with VMAT received significantly higher means of average doses than those treated with IMRT. Mean of average doses: IMRT: 35.79 ± 11.39 Gy; VMAT: 43.68 ± 10.79 Gy. Mean of maximum doses: IMRT: 63.87 ± 9.17 Gy; VMAT: 64.84 ± 10.13 Gy.

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