ESTRO 2023 - Abstract Book

S1378

Digital Posters

ESTRO 2023

verification plan recalculated on the new volumetric CBCT dataset acquired immediately after the simulation in an IRB approved imaging study. Results Figure 1 shows that the variations of the CBCT calibrations are within 0.5% and 0.3% for tube voltage 125kVP and 140kVp, respectively. The difference of the averaged CBCT calibration curves was less than 2% in the bony area between the two tube voltages. The top of the Figure 2 shows the mean discrepancy of the electron densities was 0.0045 with a range between -0.02 and 0.04. The bottom of the Figure 2 shows the DVH comparison between a clinically approved plan created on a simulation CT and re-calculated on a volumetric CBCT dataset from the new imaging system acquired immediately after the patient’s simulation.