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Conclusions
• CT remains the preferred image modality
• CT calibration curves and tissue segmentation key to accurate dose
calculation
• Be aware of how your TPS uses CT data (mass or electron density)
• Understand assumptions and uncertainties in CT data
• Investigate how your CT/TPS deals with high density
• Dw and Dm debate continues but important to specify medium in
literature
Numerous approximations whose impact on
the final dose accuracy should not be ignored!