S2874
RTT - RTT education, training, and advanced practice
ESTRO 2026
treatment, and 26% traveled > 90 minutes to the hospital. Almost all patients (95%) preferred same-day planning and treatment.Since February 2025, ten patients (six renal, four pancreatic) underwent the OSS workflow (1x26 Gy kidney, first fraction of 5x8 Gy pancreas). Nine patients filled out the satisfaction survey. The average total duration was 4h29 minutes. Total time improved from 5h5 minutes for the first five patients to 3h58 minutes for the last five patients. All patients reported a positive experience and appreciated the reduced waiting time and travel burden. One patient indicated that the time between simulation and treatment was too long. Conclusion: A patient-centered OSS workflow on the MR-Linac is feasible and efficient. This workflow shows that, despite high complexity and high fraction dose, treatment can be safely delivered within hours after simulation. Workflow optimization enabled treatment within five hours which was highly appreciated by patients, highlighting the value of integrating patient feedback in MRIgSABR workflow design. Keywords: MRIgRT, Patient experience, One-Stop- Shop References: 1: Palacios, M.A. Verheijen, S. Schneiders, F.L. Bohoudi, O. Slotman, B.J. Lagerwaard, F.J. Senan, S. Same-day Consultation, Simulation and Lung Stereotactic Ablative Radiotherapy Delivery on a Magnetic Resonance-linac. Physics and Imaging in Radiation Oncology. 2022. 76-81 Digital Poster 3144 Establishing MRI in the treatment position for patients with hepatobiliary malignancies Anna Crawley 1 , Laura Allington 1 , Emma Dwyer 1 , Caroline Thould 1 , Turmi Patel 1 , Amanda Webster 1,2 1 Radiotherapy and Proton Beam Therapy, UCLH, London, United Kingdom. 2 Medical Physics and Biomedical Engineering, UCL, London, United Kingdom Purpose/Objective: Optimising MRI for hepatobiliary (HPB) radiotherapy planning requires adapting sequences to capture motion and soft-tissue contrast in the treatment position. Despite MRI’s recognised advantages, there is limited literature describing the optimal workflow for acquiring and integrating MRI into radiotherapy pathways. This work assesses the development of an MRI-in-treatment-position workflow for HPB cancers, detailing the iterative optimisation of sequences, processes, and multidisciplinary coordination underpinning implementation. Material/Methods: Development began with a literature review, inter-
treatment for those who require further support. Keywords: Inclusivity, DIBH
Digital Poster Highlight 3090
Feasibility and patient experience of a same-day plan-and-treat SABR workflow on MRI-Linac: pre- and post-treatment surveys. Nienke Weitkamp, Sonja Verheijen, Daphne Damhoff, Omar Bohoudi, Miguel A Palacios, Claire van Vliet, Anna M.E. Bruynzeel Radiotherapy, AmsterdamUMC, Amsterdam, Netherlands Purpose/Objective: Same-day MRI-guided stereotactic ablative body radiotherapy (MRIgSABR) is technically feasible, for instance for lung tumors (1). However, patient perspectives and workflow optimization across other tumor sites have not yet been evaluated. This study investigated the feasibility and patient experience of a highly complex same-day plan-and-treat, ‘One Stop Shop’ (OSS) workflow on the MR-Linac MRIdian (ViewRay Systems), supported by pre-and post-
treatment surveys. Material/Methods:
A preliminary survey among the general MRIdian patient population assessed waiting times between simulation and first treatment, travel burden, and the desirability of an OSS option for treatment. Based on these results, a streamlined same-day plan-and-treat workflow was developed, aiming to complete consultation, simulation, planning, and adaptive treatment within five hours. This workflow is shown in figure 1. Dedicated planning templates for renal and pancreatic tumor sites were implemented to minimize total procedure time. Patients were eligible for OSS when treated with a single fraction, or OSS was applied for the first fraction of longer schedules. After treatment, patients completed a satisfaction survey evaluating their experience and perceived efficiency.
Figure 1: OSS workflow Results: In the initial survey (n=19), 58% of patients reported >2 weeks between simulation and first
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