S2883
RTT - RTT education, training, and advanced practice
ESTRO 2026
Digital Poster 4113
Optimising the image positioning control of benign pathologies such as plantar fascitiis with Surface Guided Radiation Therapy (SGRT). Ainoa Vizuete Pérez 1 , Jéssica Jimenez Sánchez 2 , Miriam Mancera Soto 1 , Sonia Bermejo Martínez 2 , Erica Vilanova Rodríguez 2 , Josep Isern Verdum 2 1 Radiation Physics and Radiation Protection, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain. 2 Radiation Oncology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain Purpose/Objective: This study aimed to evaluate and optimize the positioning control imaging protocol initially designed for standard extremity treatments by implementing SGRT in patients with benign plantar fasciitis. Material/Methods: A retrospective observational study was conducted in patients diagnosed with plantar fasciitis treated during 2025. A total of 30 patients were included. Postural video, SGRT (AlignRT), and intrafraction monitoring were used for setup and treatment verification (figure 1). No thermoplastic masks were used, as patient positioning was fully guided by SGRT. Displacements were recorded and compared in the vertical, longitudinal, and lateral directions. Statistical analysis was conducted using Python-based tools for descriptive and correlation analysis.
Conclusion: SGRT achieved positioning accuracy with limited inter- axis correlation, indicating stable and reproducible setup performance improving intrafraction monitoring. These findings support workflows to reduce imaging frequency in benign pathologies, ensuring equivalent accuracy. Additionally, the optimized protocol reduces total radiation dose and decreases treatment costs, as the use of thermoplastic masks is not required. Keywords: benign, treatment References: Freislederer, P., Kügele, M., Öllers, M., Swinnen, A., Sauer, T.O., Bert, C., Giantsoudi, D., Corradini, S., & Batista, V. (2020). Recent advances in surface guided radiation therapy. Radiation Oncology, 15, 187. Low- Dose radiation therapy for benign pathologies” (2020). Radiotherapy for benign pathologies – review article.Radiotherapy & Oncology, Leong, B., et al. (2019). Impact of use of optical surface imaging on initial patient setup and reduction of imaging dose. Practical Radiation Oncology (open access). Digital Poster Highlight 4128 Impact of RTT empowerment on workflow efficiency in lung SBRT Audrey Jean Hendricks 1,2 , Robert Förster 1 , Daniel Rudolph Zwahlen 1,3 , Alessandro Clivio 2 , Joana Cristina de Azevedo Gomes 1,2 , Christoph Oehler 1,2 1 Radiation Oncology, Cantonal Hospital Winterthur, Winterthur, Switzerland. 2 Radiotherapy Center Rüti, Cantonal Hospital Winterthur, Rüti, Switzerland. 3 Radiotherapy Center Rüti, Cantonal Hospital Winterthur, Winterthur, Switzerland Purpose/Objective: Stereotactic body radiotherapy (SBRT) for lung tumors is a complex and time-intensive procedure. Despite advances such as flattening-filter-free (FFF) beams, volumetric modulated arc therapy (VMAT), and surface-guided radiotherapy (AlignRT®, VisionRT®), overall treatment duration remains considerable, and data on workflow components are limited. In 2021, Cantonal Hospital Winterthur (center A) and its
Results: The variables of vertical (vert), longitudinal (long), and lateral (lat) displacement were analyzed across 159 observations (figure 2). The mean values (±SD) were:Vert: − 0.07cm ± 0.17cmLong: 0.00cm ± 0.17cmLat: 0.02cm ± 0.18cmAll distributions deviated from normality according to the Shapiro–Wilk test (p < 0.001 for all variables). Pearson’s correlation analysis showed a mild association between longitudinal and lateral displacements (r = 0.31), while correlations among other axes were minimal (r < 0.1).
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