Research Article
A Hybrid IMRT/VMAT Technique for the Treatment of Nasopharyngeal Cancer
Table 2
Dosimetric comparison of OARs for 9F-IMRT, 2ARC-VMAT, and Hybrid IMRT/VMAT plans.
| | 9F-IMRT | 2ARC-VMAT | Hybrid | Pairwise comparison | | | |
| | Spinal cord | | | | | | | | (0.03 cc) (Gy) | 41.3 ± 1.9 | 42.3 ± 3.1 | 41.7 ± 2.6 | 0.44 | 1.00 | 0.61 | | Brainstem | | | | | | | | (Gy) | 47.7 ± 3.3 | 48.1 ± 3.5 | 47.6 ± 3.1 | 1.00 | 1.00 | 1.00 | | Optical nerve | | | | | | | | (Gy) | 34.7 ± 18.3 | 37.8 ± 19.3 | 37.8 ± 17.7 | 0.58 | 0.33 | 1.00 | | Optic chiasm | | | | | | | | (Gy) | 40.2 ± 15.5 | 40.8 ± 17.8 | 42.3 ± 16.3 | 1.00 | 0.98 | 0.35 | | TMJ | | | | | | | | (Gy) | 56.6 ± 7.1 | 53.9 ± 9.1 | 53.5 ± 8.0 | 0.24 | 0.11 | 1.00 | | Mean (Gy) | 42.9 ± 7.1 | 39.3 ± 7.7 | 37.4 ± 7.7 | 0.02 | 0.00 | 0.34 | | Mandible | | | | | | | | (Gy) | 67.2 ± 2.1 | 64.7 ± 2.6 | 63.7 ± 1.7 | 0.00 | 0.00 | 0.06 | | Mean (Gy) | 52.4 ± 2.1 | 49.0 ± 1.3 | 50.2 ± 1.8 | 0.00 | 0.03 | 0.04 | | Temporal lobe | | | | | | | | (Gy) | 54.2 ± 7.9 | 50.8 ± 10.2 | 50.0 ± 8.3 | 0.23 | 0.09 | 0.92 | | Mean (Gy) | 24.6 ± 8.3 | 21.4 ± 6.9 | 21.8 ± 6.6 | 0.00 | 0.01 | 0.31 | | Parotid R | | | | | | | | Mean (Gy) | 31.2 ± 1.9 | 29.5 ± 2.4 | 30.4 ± 2.8 | 1.14 | 1.00 | 0.04 | | | 33.6 ± 9.7 | 35.7 ± 7.7 | 34.7 ± 9.7 | 1.00 | 1.00 | 1.00 | | Parotid L | | | | | | | | Mean (Gy) | 31.7 ± 2.1 | 30.1 ± 3.1 | 31.0 ± 4.3 | 0.20 | 1.00 | 0.28 | | | 37.3 ± 9.6 | 37.1 ± 9.1 | 36.1 ± 14.7 | 1.00 | 1.00 | 1.00 | | Lens | | | | | | | | (Gy) | 8.0 ± 3.4 | 6.5 ± 1.9 | 7.4 ± 2.3 | 0.05 | 0.57 | 0.00 | | Eyes | | | | | | | | (Gy) | 34.0 ± 4.6 | 27.9 ± 11.4 | 29.1 ± 10.7 | 0.06 | 0.24 | 0.35 | | Mean (Gy) | 10.5 ± 5.1 | 10.3 ± 5.1 | 10.3 ± 4.7 | 1.00 | 1.00 | 1.00 | | Unspecified tissue | | | | | | | | (Gy) | 64.7 ± 2.2 | 61.5 ± 2.9 | 61.1 ± 2.4 | 0.00 | 0.00 | 0.79 | | Mean (Gy) | 17.7 ± 3.9 | 16.5 ± 3.5 | 17.0 ± 3.8 | 0.00 | 0.02 | 0.01 |
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TMJ = temporomandibular joint.
: 9F-IMRT versus 2ARC-VMAT; : 9F-IMRT versus Hybrid; : 2ARC-VMAT versus Hybrid.
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