ESTRO 2025 - Abstract Book

S395

Brachytherapy - Urology

ESTRO 2025

was recalculated in the TPS based on the original dwell times from the clinical treatment and the AIEMT-based needle positions. The dosimetric parameters of the clinical and AIEMT-based dose distributions were compared.

Results: AIEMT measurements were performed within 11 min. AIEMT-based reconstruction generation and import to TPS was performed within 3 min. Regarding the plan comparison, a median (IQR) difference of -0.3% (2.0%) was found for the V 100% in the target. For the organs at risk, median (IQR) differences of the urethra D 0.1cc , rectum D 1cc , and bladder D 1cc , were -1.7% (4.6%), -1.4% (4.3%), and 1.4% (1.7%) of the prescribed dose, respectively. A more detailed dosimetric comparison is shown in Figure 2.

Conclusion: An AIEMT-based implant reconstruction workflow has been developed. Implementing this workflow in clinical practice could lead to shorter treatment planning time and reduction of dosimetric uncertainty caused by reconstruction errors.