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Summary
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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