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Take home messages
•
GTV is tumour you can
See - Feel – Image
•
Outline what you see!
•
CTV - contains GTV and/or sub-clinical disease
•
Tumour
cannot
be seen or imaged
•
Can be individualised to anatomy
•
PTV is a geometric volume
•
Ensures prescription dose is delivered to the CTV
•
Includes systematic + random error components