ESTRO 2025 - Abstract Book

S4117

RTT - Patient care, preparation, immobilisation and IGRT verification protocols

ESTRO 2025

Conclusion: Modern pelvic immobilization techniques significantly mitigate setup variations during pelvic radiation therapy. Among these, thermoplastic mold immobilization demonstrated superior performance, achieving the lowest day-to day setup variability in all measured translational and rotational directions and the shortest setup times. This finding highlights thermoplastic mold as the optimal technique for centers aiming to enhance treatment accuracy and efficiency, particularly under resource-limited conditions.

Keywords: Pelvic RT, immobilization techniques, setup errors

3276

Digital Poster Time Analysis of Proton Therapy Treatment Delivery for Workflow Optimization

Federico Mastroleo 1,2 , Gaia Gavazzeni 2 , Fabiana Castelluccia 1 , Enrica Borghetti 1 , Giorgia Ordano 1 , Francesca Baldini 1 , Lorenzo Storgato 1 , Martina Persiani 1 , Alberto Rampinelli 1 , Gaia Piperno 1 , Annamaria Ferrari 1 , Giulia Marvaso 1,2 , Luca Bergamaschi 1 , Giovanni Carlo Mazzola 1 , Samantha Dicuonzo 1 , Stefania Volpe 1,2 , Massimo Sarra Fiore 1 , Roberto Orecchia 3 , Daniela Alterio 1 , Barbara Alicja Jereczek-Fossa 1,2 1 Division of Radiation Oncology, IEO European Institute of Oncology IRCCS, Milan, Italy. 2 Department of Oncology and Hemato-Oncology, University of Milan, Milan, Italy. 3 Scientific Directorate, IEO European Institute of Oncology IRCCS, Milan, Italy Purpose/Objective: Optimizing workflow efficiency in proton therapy facilities is essential for identifying areas of improvement and enhancing patient care. However, quantifying the time required for different stages of treatment delivery can be challenging due to the involvement of multiple factors and personnel. This study aimed to assess the durations of key actions in proton therapy treatment delivery to identify potential bottlenecks and opportunities for optimization during the first 8 months of activity. Material/Methods: From January to August 2024, consecutive patients treated at our proton therapy facility were included in this prospective study. Four critical stages of the treatment delivery process were timed using a chronograph: 1. Patient Positioning: From entry into the treatment room until the completion of patient positioning. 2. Image Acquisition: From the end of positioning until the completion of imaging. 3. Image Verification: From the end of image acquisition until the end of the physician's assessment of the CBCT. 4. Treatment Delivery: From the acceptance of the target image until the end of treatment delivery. If re-positioning was necessary, the times were cumulatively added to the initial measurements. Mean times and standard deviations were calculated for each stage. Analysis of variance (ANOVA) and Tukey's post-hoc test were, with statistical significance set at p < 0.05.