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Table 3 Volumes for general PTVs and the union of BSPTVs for all patients, and the beam angles corresponding to the extreme values of CTV projection area and the plan selected beam angles

From: Evaluation of OAR dose sparing and plan robustness of beam-specific PTV in lung cancer IMRT treatment

Patient nos. CTV volume (cm3) General PTV volume (cm3) BSPTV volume (cm3) Volume difference (%) Beam angles for maximum, 2nd maximum ITV projection area Selected beam angles
1 36.9 83.9 76.0 − 10.4 204, 180 90, 150, 180, 230
2 11.5 29.2 27.9 − 4.7 175, 210 21, 150, 180, 210, 335
3 6.7 22.9 18.8 − 21.8 300, 320 0, 30, 170, 300
4 87.7 164.5 153.9 − 6.9 102, 90 0, 30, 160, 190, 220
5 12.6 35.0 30.3 − 15.5 90, 315 0, 90, 175, 315
6 3.1 12.9 11.3 − 14.2 195, 180 70, 130, 180, 210
7 270.9 466.2 443.6 − 5.1 0, 220 0, 30, 160, 220, 290
8 10.2 27.6 25.6 − 7.8 106, 320 10, 40, 180, 330
9 1.5 9.0 7.0 − 28.6 160, 125 40, 130, 180, 210
10 57.6 155.4 146.3 − 6.2 45, 90 40, 95, 175, 225
11 12.3 32.9 31.3 − 5.0 0, 210 0, 130, 170, 210
12 8.9 31.1 28.1 − 10.7 130, 145 15, 150, 180, 210, 240
13 72.7 102.8 99.8 − 3.0 320, 50 320, 40, 0, 170
14 9.4 26.0 24.6 − 5.6 270, 240 240, 210, 180, 150, 15
15 14.4 40.0 36.7 − 8.7 250, 180 210, 180, 150, 120, 345