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Using Dose Volume Histograms for plan evaluation
•
Complications with a weak volume dependence
•
Use high-dose end of the DVH
•
D
max
, D
05
•
E.g. spinal cord
•
Complications with strong volume dependence
•
mean dose
•
other features (e.g. V20), from clinical studies
•
E.g. lung
•
Intermediate volume dependence
•
Other features (V
D
= % volume getting > dose D)
•
E.g. rectum
• Remember spatial aspects not included in DVH but may matter:
• Circumferential irradiation of oesophagus
• Hotspots in un-contoured areas
ALWAYS REVIEW THE PLAN IN 3D