ESTRO 2025 - Abstract Book

S3582

Physics - Quality assurance and auditing

ESTRO 2025

Conclusion: DIR provides statistically significant better consistency in transfer of OAR from CT-old to CT-new than RIR; and significantly different DVH-values compared to RIR. This supports the preferential use of DIR for reirradiation planning in lung cancer, and will be crucial for ensuring reproducible and safe reirradiation in the forthcoming CURE Lung trial.

Keywords: reirradiation registration dose-mapping

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Digital Poster Comparison of multi-institutional CT number conversion methodologies for stopping power prediction in Japan and Europe Minoru Nakao 1,2 , Julian Schwengfelder 3 , Nils Peters 4 , Shuichi Ozawa 1,2 1 Department of Radiation Oncology, Hiroshima High-Precision Radiotherapy Cancer Center, Hiroshima, Japan. 2 Department of Radiation Oncology, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan. 3 OncoRay-National Center for Radiation Research in Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, TUD Dresden University of Technology, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany. 4 Department of Radiation Oncology, Mass General Brigham and Harvard Medical School, Boston, MA, USA