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Table 2 Treatment Characteristics

From: Clinical outcomes of image-guided proton therapy for histologically confirmed stage I non-small cell lung cancer

Characteristic All Inoperable Operable
No. of patients 55 21 34
No. of portals, 2/3/4 3/41/11 0/18/3 3/23/8
Position matching method
 Fiducial marker 39 (71%) 14 (67%) 25 (74%)
 Vertebral bone 16 (29%) 7 (33%) 9 (26%)
IGTV definition
 IGTV-all 48 (87%) 18 (86%) 30 (88%)
 IGTV-gate 7 (13%) 3 (14%) 4 (13%)
 GTV (cc), median (range) 11 (1.1–53) 12 (1.7–38) 10 (1.1–53)
 IGTV (cc), median (range) 17 (1.8–80) 22 (2.8–53) 15 (1.8–80)
DVH parameters
 IGTV V95% (%), median (range) 100 (97–100) 100 (99–100) 100 (97–100)
 IGTV D95% (%), median (range) 100 (97–100) 99 (98–100) 100 (97–100)
 Lung-GTV V5 (%), median (range) 14 (4.3–28) 14 (4.3–28) 13 (5.2–25)
 Lung-GTV V20 (%), median (range) 9.3 (3.0–21) 9.6 (3.0–21) 8.7 (3.7–18)
  1. Abbreviations, IGTV internal gross tumor volume, GTV gross tumor volume, DVH dose-volume histogram. V95% = volume receiving > 95% of the prescribed dose, D95% = minimum doses covering 95% of the volume, V5, 20 = volume receiving dose > 5/20 Gy(RBE)