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Adaptive Planning Based on CBCT 2
• Recalculation of planned dose using CBCT
• Are HU on CBCTs accurate?
 Some conflicting evidence in the literature
 Depends on the quality of your CBCT
• Options to overcome these uncertainties:
 Pixel correction technique
 CT numbers from conventional CT are applied to CBCT
 Deformable registration
 Deform planning CT to the CBCT to calculate “dose of the day”
 This is a move towards “online” ART