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Table 2 Dose volume objectives, deviations, and benchmark case results (data for 36 cases)

From: Quality assurance of the SCOPE 1 trial in oesophageal radiotherapy

Structure & Dose Volume Objective Minor Deviation Major Deviation Range
Achieved
Number of
Deviations
Type a algorithm:
PTV V95% > 99.0%
PTV deviations were not pre-classified but reviewed individually 98.6–100.0% 4 deviations
(98.6, 98.8, 98.9, 98.9%)
Type a algorithm:
PTV point minimum dose >93.0%
86.5–96.5% 2 deviations
(86.5, 92.7%)
Type b algorithm:
PTV V95% > 99.0% - [0.4 x % PTVoverlap]
92.4–99.3% no deviations
ICRU maximum dose <107% 120% > max > 107% max >120% 103–108% 2 minor deviations
(108, 108%)
Heart V40Gy < 30.0% 50% > V40Gy > 30% V40Gy > 50% 16.1–33.0% 1 minor deviation
(33.0)
Liver V30Gy < 60.0% 70% > V30Gy > 60% V30Gy > 70% 0.0–4.2% no deviations
Combined lung V20Gy < 25.0% 35% > V20Gy > 25% V20Gy > 35% 20.4–33.5% 18 minor deviations
(6 of which >30%)
Spinal cord PRV D1cc < 40.0Gy N/A D1cc >40Gy 34.2–41.5Gy 2 major deviations
(40.1, 41.5)