ESTRO 2023 - Abstract Book

S1543

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ESTRO 2023

Results For each patient, the mean values and the range of the total dose received by each structure were calculated considering all CBCTs (Table 1). These values were compared with the total dose delivered by the radiotherapy treatment (determined by the TPS) to calculate the relative increase with respect to this dose ( Δ D) due to the CBCTs. As shown in Table 1, on average the dose received by CBCT in OARs increases the absorbed dose by 5% over the treatment dose. For body, lungs and spinal cord, increases of 4.5-6.7% were found, while for heart and bone this increase is 34.5% and 11.2%, respectively.