ESTRO 2023 - Abstract Book

S1441

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ESTRO 2023

The clinical relevance of these incidents was not homogeneous. Some of them did not directly impact the treatment received by the patient and could be corrected on-the-fly (e.g., field nomenclature or image scheduling according to the protocol). However, others did. On the one hand, some prevented treatment with the original plan (e.g., collisions or MUs below the minimum for dynamic wedges) and required re-planning, thus modifying the dose distribution and adding a delay. On the other hand, other items could have been overlooked during the treatment and impaired the patient's clinical response, such as those related to bolus or laterality. Regarding this latter category, the number of reported incidents is a downward biased indicator as we cannot be sure that all of them have been caught. The use of ClearCheck would have reduced 44% of incidents. It would have detected the most relevant items systematically, thus improving treatment safety and consistency for all patients. Moreover, ClearCheck would have caught them earlier, preventing them from reaching later stages as was the case for most of the incidents studied (see figure 2), which were detected in the first session (71%) or even during (7%) or after treatment (7%).

Conclusion We assessed the potential reduction of reported incidents at our institution using ClearCheck. Adopting ClearCheck would have saved 44% of incidents, including some of the most clinically relevant. Automated checks improve treatment safety and consistency for all patients.

PO-1725 An investigation of the Energy-Specific Isocentricity on SABR C-arm Linacs

S. Lim 1 , M. Lovelock 2 , L. Happersett 1 , J. Moran 1

1 Memorial Sloan Kettering Cancer Center, Medical Physics, New York, USA; 2 Mount Sinai Hospital, Radiation Oncology, New York, USA