ESTRO 2025 - Abstract Book

S2751

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

ESTRO 2025

Conclusion: Utilizing the benefit of showing no metal shadow in DD-CT containing small metal implants, dosimetric impact on targets is minimal, exhibiting the desired steep dose fall-off despite a slight dose increase. Conversely, notable dosimetric changes in OARs were observed. The results provide insight into the feasibility of performing CK treatment planning based on DD kernel applied CTs for small dimension metal implants.

Keywords: DirectDensity, CyberKnife, metal implant

References: [1] Ritter A. (2016). DirectDensity TM : technical principles and implications for radiotherapy (white paper). [2] Flatten V, Friedrich A, Engenhart-Cabillic R, Zink K. A phantom based evaluation of the dose prediction and effects in treatment plans, when calculating on a direct density CT reconstruction. J Appl Clin Med Phys. 2020 Mar;21(3):52-61. doi: 10.1002/acm2.12824. PMID: 32176455; PMCID: PMC7075385.

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Digital Poster Evaluation of a RapidPlan model in left-sided breast cancer radiotherapy and the impact on plan quality and planning time Venla Kääriä, Martti Vihermetsä, Lauri Koivula Radiation oncology, Kotka central hospital, Kotka, Finland Purpose/Objective: We evaluated an automatic treatment planning model (RapidPlan, RP, Varian) for left-sided breast patients. The model was created to standardize the quality of treatment plans between radiotherapy planners and to reduce planning time [1]. The evaluation was carried out by comparing clinically implemented manually created plans (CP =