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Table 2 Patterns-of-care in SBRT using RTRT

From: Clinical outcomes of stage I and IIA non-small cell lung cancer patients treated with stereotactic body radiotherapy using a real-time tumor-tracking radiotherapy system

  n Adenocarcinoma SCC
Number of ports
 4 2 1 1
 5 89 64 21
 6 173 101 56
 7 17 14 2
 8 4 4 0
 9 1 1 0
X-ray energy (MV)
 4 4 4 0
 6 231 148 64
 10 51 33 16
CTV margin (mm)
 0 140 94 33
 5 3 0 3
 6 32 2 30
 7 5 2 0
 8 84 71 9
 9 5 3 2
 10 4 3 0
 11 12 10 2
 12 1 0 1
PTV margin (mm)
 3 67 47 16
 5 112 70 34
 7 17 11 4
 8 74 47 22
 10 11 6 3
 12 1 1 0
 unclassifiable 4 3 1
Margin from GTV to PTV (mm)
 0–4 67 47 16
 5–9 57 37 13
 10–14 110 66 38
 15– 48 32 12
 unclassifiable 4 3 1
Calculation algorithms
 Clarkson 39 29 10
 Superposition 247 156 70
Prescription
 PTVD95 97 59 27
 Isocenter 189 126 53
Dose (Gy/Fr)
 Prescription: PTVD95
 40/4 94 56 27
 others 3 3 0
Prescription: Isocenter
 48/4 149 99 42
 50/5 19 13 4
 others 21 14 7
BED (10) at the Isocenter (Gy)
  ≥ 100 205 134 55
  < 100 81 51 25
BED (10) at the Isocenter (Gy)
  ≥ 90 267 173 74
  < 90 19 12 6
  1. BED biologically effective dose, CTV clinical target volume, Fr fractions, GTV gross tumor volume, Gy gray, MV megavoltage, PTV planning target volume, RTRT real-time tumor-tracking radiotherpay, SBRT stereotactic body radiotherapy