ESTRO 2025 - Abstract Book

S2931

Physics - Dose prediction, optimisation and applications of photon and electron planning

ESTRO 2025

Conclusion: In vivo dosimetry is a reliable tool for evaluating dose distribution during radiotherapy, sensitive to anatomical variations. Data suggest that coverage of planning target volumes decreases as differences between measured and calculated doses increase. A Gamma passing rate of 91%-94% with 7 mm distance to agreement and 3% dose difference may indicate the need for replanning. However, clear clinical guidelines on tolerance criteria and corrective actions are lacking. Expanding this study to other anatomical sites could establish standardized protocols for clinical use. References: Low DA, Harms WB, Mutic S, Purdy JA. A technique for the quantitative evaluation of dose distributions. Med Phys. 1998 May; Van Dyk J, Barnett RB, Cygler JE, Shragge PC. Commissioning and quality assurance of treatment planning computers. Int J Radiat Oncol Biol Phys. 1993 May 20; Recommendations of AAPM Task Group No. 218; Harms WB Sr, Low DA, Wong JW, Purdy JA. A software tool for the quantitative evaluationof 3D dose calculation algorithms. Med Phys. 1998 Oct; E. Bossuyt, R. Weytjens, D. Nevens, S. De Vos, and D. Verellen, “Evaluation of automated pre-treatment and transit in-vivo dosimetry in radiotherapy using empirically determined parameters” . Keywords: in vivo dosimetry, Head and Neck tumors , EPID