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Table 2

Dosimetric constraint results.

ROIs Constraints PI PFBCT PA
Lung Mean ≤ 1700 cGy (cGy) 1090.45 1140.62 984.66
V20 ≤ 25% (%) 16.99 18.34 17.30
V30 ≤ 20% (%) 13.70 15.36 12.50
V5 ≤ 60% (%) 40.29 39.97 37.13
Ipsilateral lung Mean (cGy) 3166.81 3085.92 2690.78
V20 (%) 67.79 64.66 60.98
V30 (%) 56.33 55.53 45.18
V5 (%) 83.87 79.65 78.28
Contralateral lung Mean (cGy) 423.17 396.74 332.26
V20 (%) 0.66 0.63 0.60
V30 (%)
V5 (%) 26.28 24.80 21.39
Spinal cord Dmax ≤ 4000 cGy (cGy) 2641.34 2884.09 2745.21
Heart Dmean ≤ 2000 cGy (cGy) 1069.7 943.85 878.72
V30 (%) 13.30 10.99 9.61
V40 (%) 8.71 6.93 6.25
V50 ≤ 25% (%) 4.39 3.29 2.86
Esophagus Dmean ≤ 3000 cGy (cGy) 1959.12 1957.15 1885.68
Dmax ≤ 5500 cGy (cGy) 5289.04 5309.33 5231.02
V40 ≤ 30% (%) 26.54 28.29 26.15
PTV V50 ≥95% (%) 95.18 96.53 95.18
PTV D95 ≥5000 cGy (cGy) 5005.23 5032.31 5005.30
CTV V50 N/A (%) 99.92 99.50 99.99
CTV D95 N/A (cGy) 5102.25 5076.69 5130.27
GTV-T V50 N/A (%) 99.96 99.62 99.99
GTV-T D95 N/A (cGy) 5092.84 5070.64 5126.56

Abbreviations: ROIs = regions of interest; PI = initial plan; PFBCT = recalculating initial plan on the images of fan beam computed tomography when online adaptive radiotherapy; PA = adaptive plan.

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