S2861
RTT - RTT education, training, and advanced practice
ESTRO 2026
for treatmentplanningbetweenFeb1, 2024, and Apr 3, 2025.Weintend to adopt the simulation as standard procedure if 25% reportimprovedexperience. Results: At time of submission, 10 patients had been included (1 woman, 9 men; age 41-83 years).All 10 patients completed the scan, all without sedatives: 8/10patients reported that the simulation made a difference in their experience of the scan.9/10reported that simulation with the 3D-printed model was meaningful while 2/10found both the model and viewing images of the simulation and MRI set-up meaningful.In the retrospective group, 7/41 were unable to complete the scan and 8/41required sedatives (p~0.3 comparing both proportions to the 0/10 with simulation). Conclusion: After simulation with the 3D-printed model, all patients completed the MRI treatment planning scan without interruptions or sedatives. Simulation prior to scanning is a promisingmethod to improvebothcomfor t andscan feasibility,and the projectwillcontinue to accrue. Keywords: MRI-simulation, head-and-neck cancer, 3D- print Digital Poster 2152 Optimising Re-imaging Strategies in Image-Guided Radiation Therapy: A Quality Improvement Initiative for Gynaecological Oncology Yixin Jeannie Lin, Lele Tan, Jie Min Clairene Chng, Semaya Natalia Chen Division of Radiation Oncology, National Cancer Centre Singapore, Singapore, Singapore Purpose/Objective: Image-guided radiation therapy (IGRT) enhances treatment precision by improving target accuracy, enabling higher tumour doses than previously achievable. IGRT provides improved visualisation that allows for timely correction, enabling daily adaptive treatment. Whilst this increases treatment accuracy, it requires re-imaging upon correction and consequently, additional radiation exposure due to re- imaging. By establishing clear purposes for re-imaging, overall clinical workflow and patient care delivery can be enhanced. Material/Methods: This study was done retrospectively, using data from 275 gynecological cancer patients who underwent radiotherapy from March 2023 to December 2024. 192 patients had weekly cone-beam computed tomography (CBCT) while remaining 83 patients had daily CBCT. 2473 CBCTs were analysed for re-imaging.
We3D-
printed amodel of a Siemens Healthineers coil(UltraFlex Large 18 A 3T Tim Coil)used for head and neckscanning (fig. 1). For the simulation of a small UltraFlexcoil, we used a bolus that matched the weight of the coil.At the mask molding appointment, patients received standard information about the treatment coursesupported by images of the scan set- up (fig. 2). During mask drying, the 3D-printed modelwas placed over the head and neck, and theflex coil simulator was placed on the patient’s chest.Evaluation of the simulation included: a prospective questionnaire survey with separate forms for patients and staff, and a retrospective data collection, both planned toinclude41 patients.The patient questionnaire contains questions addressingthe patient’s experience of the simulation. The staff questionnaireassessesthe patient’s ability to complete the scan. The prospective part began in June 2025.The retrospectivereview included patients whoun derwent mask fixationfor cancer in the head and neckareaand MRI scan
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