Fig. 2
Comparison of target and OAR-doses for sCT and CT dose-distributions. Deviation showed in % of the prescribed dose of 78 Gy for the DVH-parameters in the clinical protocol used for treatment planning. Outliers are represented as black circles. Three patients in the study cohort had dose deviations between sCT and CT that exceeded 2% in CTVmin, PTVD98, Rectum D10 or Rectum D15 seen as red diamonds. The remaining population had deviations below 2% for all DVH-parameters. The explanation to the deviations above 2% was rectal gas in close connection to the CTV in the CT-images. This was concluded by replacing the rectal gas for these three patients with HU = 0 in the TPS and recalculation of the plan. All deviations were after recalculation below 2% in comparison to the sCT dose-distribution and the outliers were eliminated