2017_IGRT course book

Conclusion: MVCT/MV CBCT

 Geometric accuracy:

 MV CT: Mechanical rigidity of the system minimizes geometrical uncertainties.  MV CBCT: Geometrical uncertainties are quantified and included in projection matrices and filtered back projection algorithm.  Image quality:

Always worse than planning CT

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 MV CT and CBCT mostly ready to be used for dose calculations  Patient dose:

Depends on what you ask for.

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ESTRO IGRT 2008