S2846
RTT - RTT education, training, and advanced practice
ESTRO 2026
References: Callens D et al. (2024). A prospective randomized study comparing two frameless immobilization systems for cranial stereotactic radiotherapy. Tech Innov Patient Support Radiat OncolSánchez-Rubio P et al. (2024). New findings on clinical experience on surface-guided radiotherapy for frameless non- coplanar stereotactic radiosurgery treatments. J Appl Clin Med PhysZhou S et al. (2022). Initial clinical experience of surface guided stereotactic radiation therapy with open-face mask immobilization for improving setup accuracy: a retrospective study. Radiat OncolDe Ornelas M et al. (2021). Assessment of intra-fraction motion during automated linac-based SRS treatment delivery with an open face mask system. Phys Medica Prospective investigation of skin reactions during volumetric modulated arc therapy (VMAT) of the prostate Malin Jansson 1 , Anne-Kari Klavsen 1 , Jonas Scherman 2 , Jonas Magnusson 3 , Joakim Larsson 3 , Elinore Wieslander 2 , Adalsteinn Gunnlaugsson 1,4 , Emilia Persson 2,5 1 Oncology, Department of Hematology, Oncology and Radiation Physics, Skåne University Hospital, Lund, Sweden. 2 Radiation Physics, Department of Hematology, Oncology and Radiation Physics, Skåne University Hospital, Lund, Sweden. 3 Medical Radiation Digital Poster 871 Physics, Department of Clinical Sciences, Lund University, Lund, Sweden. 4 Faculty of Medicine, Department of Clinical Sciences, Lund University, Lund, Sweden. 5 Medical Radiation Physics, Department of Translational Medicine, Lund University, Malmö, Sweden Purpose/Objective: In volumetric modulated arc therapy (VMAT) planning for prostate cancer, efforts are made to deliver a conform treatment which may redistribute the dose to other areas, such as the skin. Skin reactions associated with VMAT-treatment for prostate cancer have, to our knowledge, not been thoroughly studied.Here we present the results from a prospective study (Dnr 2023-06678-01) investigating skin reactions during modern curative radiotherapy of the prostate. Material/Methods: Patients prescribed curative radiotherapy of the prostate or prostate bed, with or without vesicle and nodal involvement, were included. The study protocol included assessment of skin tissue disorders, pruritus, pain of skin, ulceration and radiation dermatitis according to Common Terminology Criteria for Adverse Events (CTCAE) 5.0 [1] in the groin and
Klemen Salmi č 1 , Nejc Meki š 2 1 Departmen of Teleradiotherapy, Institute of
Oncology, Ljubljana, Slovenia. 2 Department of Medical Imaging and Radiotherapy, University of Ljubljana, Faculty of Health Sciences, Ljubljana, Slovenia Purpose/Objective: This study compared patient setup accuracy in stereotactic radiosurgery using surface-guided radiotherapy (SGRT) and manual setup by assessing translational and rotational deviations to determine whether SGRT improves setup precision. Material/Methods: A prospective study was conducted on 20 adult patients treated with HyperArc SRS for brain metastases on a Varian TrueBeam STx linear accelerator. All patients were immobilised using the Q- fix Encompass system, with or without a bite block. Each patient underwent two independent setup procedures: manual setup using delta couch shift and SGRT setup using AlignRT, each followed by partial cone-beam CT (CBCT) verification. Six degree of freedom deviations between the planned and CBCT- verified positions were recorded. For each patient, additional data such as sex, age, number of metastases, and use of a bite block were collected. Data were analysed using IBM SPSS 26, applying the Shapiro–Wilk test for normality and the Wilcoxon Signed Ranks Test for paired comparison, with significance set at p ≤ 0.05. Results: AlignRT setup showed significantly smaller deviations in both translational and rotational directions compared to manual setup. Improvements were statistically significant (p < 0.05) for vertical, lateral, yaw, pitch and roll directions, while longitudinal deviations were not significant (p > 0.05). Mean deviations with the AlignRT system were all within submillimeter precision (<1.5 mm and <1° in all axes) compared to manual setup. Use of a bite block further improved lateral stability. No associations were found between setup accuracy and age, sex, or number of
metastases. Conclusion:
Surface-guided setup using AlignRT significantly improves daily positioning accuracy in stereotactic radiosurgery, especially for rotational directions. The system enhances reproducibility, reduces patient- related variability, and provides additional benefit when combined with a bite block. Integrating SGRT into cranial SRS workflows can improve setup precision, reduce imaging frequency, and optimize treatment efficiency while maintaining submillimeter accuracy. Keywords: SGRT, stereotactic radiosurgery, setup accuracy
Made with FlippingBook - Share PDF online