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Table 1 The comparison of the 2D, 3D globe, and organ-specific GP (%) for 30 NPC cases with different gamma criteria

From: Retrospective dosimetry study of intensity-modulated radiation therapy for nasopharyngeal carcinoma: measurement-guided dose reconstruction and analysis

  3%/3 mm 2%/2 mm 1%/1 mm
GP (%) GP (%) GP (%)
Global GP (%)
 2D phantom verification 96.4 ± 2.9 [90.1–99.7] 90.2 ± 5.5 [74.9–99.0] 60.9 ± 9.6 [41.2–84.6]
 3Dreconstruction verification 97.7 ± 3.2 [86.3–99.6] 91.3 ± 6.2 [71.1–98.7] 67.8 ± 9.9 [40.6–88.7]
p 0.002 0.152 0.000
Organ GP (%) of 3D reconstruction verification
 PTVnx (70 Gy) 93.78 ± 11.03 [57–100] 79.24 ± 22.1 [23.1–99.8] 46.55 ± 24.83 [4–85.8]
 PTV1 (60 Gy) 95.61 ± 7.31 [72.6–100] 83.12 ± 17.19 [41.2–99.9] 50.47 ± 21.37 [8–87.9]
 PTV2 (54 Gy) 94.41 ± 7.48 [67.4–99.8] 81.32 ± 11.81 [55.3–99.4] 50.45 ± 15.46 [22.4–87.4]
 Spinal cord 98.24 ± 2.32 [90.2–100] 89.09 ± 8.45[64.3–100] 57.43 ± 14.18[30.9–85.3]
 Brainstem 99.17 ± 1.48 [93.7–100] 94.00 ± 7.41[71.9–100] 65.41 ± 19.49 [14.3–91]
 Left parotid gland 99.22 ± 2.78 [84.8–100] 95.85 ± 6.01[72.3–100] 78.84 ± 12.96 [49.1–96.8]
 Right parotid gland 99.25 ± 2.21 [89.9–100] 95.44 ± 6.15[75.8–100] 76.50 ± 15.47 [43.1–97.2]
 Left temporal lobe 99.40 ± 1.78 [92.4–100] 95.14 ± 7.51[65.6–100] 70.03 ± 24.06 [18.2–95.1]
 Right temporal lobe 99.35 ± 1.61 [92.6–100] 95 ± 6.60 [71.6–100] 69.1 ± 21.43 [11.6–96.1]
 Larynx 96.52 ± 5.21 [78.4–100] 86.38 ± 13.85[50.6–100] 55.88 ± 26.23 [12.8–90.9]
  1. p indicates significance on the two-tailed Student t-test
  2. Abbreviations:GP (%)-gamma pass rate (%); PTV - planning target volume; NPC - nasopharyngeal carcinoma;