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Wrong CT for matching: 4D-CT

4D-CT used to generate

Midvent plan.

CTV delineation at Midvent

position used to generate

PTV and position isocenter

(Plan calculated on average

CT)

CBCT should be matched

on midvent CT

However, average CT was

used, introducing

systematic shift! (planned

CTV position <> CTV

position on reference CT)