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

Figure 2

The radiation doses of maxillary and/or mandibular teeth delivered by IMRT and VMAT. Independent-samples t-test was used to compare radiation doses (). (a) No significant differences were found in the radiation doses between IMRT and VMAT to the maxillary teeth. Mean of average doses: IMRT: 26.98 ± 11.22 Gy; VMAT: 30.11 ± 8.53 Gy. Mean of maximum doses: IMRT: 49.48 ± 16.97 Gy; VMAT: 50.08 ± 18.98 Gy. (b) No significant differences were found in the radiation doses between IMRT and VMAT to the mandibular teeth. Mean of average doses: IMRT: 35.27 ± 11.90 Gy; VMAT: 38.11 ± 13.97 Gy. Mean of maximum doses: IMRT: 56.01 ± 11.80 Gy; VMAT: 57.64 ± 12.25 Gy. (c) The means of average and maximum doses of the mandibular teeth delivered by IMRT were significantly higher than when PTV excluded level Ib. Mean of average doses: PTV included level Ib: 37.63 ± 12.54 Gy; PTV excluded level Ib: 30.11 ± 8.53 Gy. Mean of maximum doses: PTV included level Ib: 58.77 ± 11.03 Gy; PTV excluded level Ib: 49.98 ± 11.39 Gy. (d) The means of average and maximum doses of the lower teeth delivered by VMAT were significantly higher than the PTV excluding level Ib. Mean of average doses: PTV included level Ib: 40.62 ± 15.01 Gy; PTV excluded level Ib: 32.38 ± 9.18 Gy. Mean of maximum doses: PTV included level Ib: 60.30 ± 11.66 Gy; PTV excluded level Ib: 51.57 ± 11.63 Gy.

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