Method: 2D/3D kV imaging and CBCT data using 6 degrees of freedom (6DoF) were compared to evaluate inter and intrafraction motion.
Results: Results showed that intrafraction errors were low and interfraction levels were within institutional protocols.
Conclusion: Confidence was given to use low dose 2D/3D kV imaging to confirm daily patient set up errors, and to use pre-treatment CBCT only once weekly for additional imaging information.
Implications For Practice: Further research is necessary to assess other uncertainties, to enable the calculation of a margin and determining the feasibility of further reduction of this.
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