S2712
RTT - Patient preparation, immobilisation, and verification protocols
ESTRO 2026
immobilisation was required. 25 radical H&N patients were selected, all of our H&N patients have daily pre- treatment CBCTs, but an additional weekly post- treatment CBCT was added, this allowed us to measure the inter-fraction and intra-fraction motion. All images are matched with a 6 degrees of freedom (DoF) couch. The only exclusion criteria was palliative patients.The occipital mask used was the occipital component of the DSPS-prominent (by MacroMedics). Patients were assessed for their suitability by the pre- radiographers at their planning CT scan. If determined to be suitable, the patient would then be given to opportunity to chose the occipital mask or the conventional closed mask. The exclusion criteria for patient selection was: patients with bolus, palliative treatment, patient's unable remaining still at rest, cognitive impairment impacting their ability to remain still, unable to lie flat and unable to fit inside the mask frame. The patients were given a patient experience survey following their CT scan to measure a range of subjective elements of making the mask such as anxiety, claustrophobia, comfort.Occipital mask patient's were also given a daily pre-treatment CBCT with a weekly post-treatment CBCT, all matched with 6DoF.The patients were positioned using SGRT and treated with beam control switched on with SGRT monitoring (tolerance = 2mm / 2°). Results: 95% of patients felt very little or no anxiety, nervousness or fear about having the occipital maskThe data shows the occipital mask inter-fraction and intra-fraction motion can be as accurate or more than conventional closed mask immobilisation and well within acceptable tolerances.
Conclusion: The occipital mask is a viable method of
immobilisation for H&N radiotherapy treatment. But more research is required to show accuracy on larger cohorts of patients due to the limited sample size and strict criteria. Keywords: Faceless, Mask, SGRT Digital Poster Highlight 1622 Motion Management in SBRT with a Novel Immobilization Device (SBRT-HRC): a Prospective, Single-Center Study. Carolina de la Pinta 1,2 , David Sevillano 3 , Alejandro De Cozar 4 , Jose Antonio Rojo 4 , María Carmen Vallejo 4 , Raul Hernanz 4 , Manuel Garví 4 , Esther Montero 4 , Sara Barrio García 4 , Maria Carmen Sabio 4 , Miguel Escribano 4 , Daniel Carbonero 4 , Sonia Rubia 4 , Desiree Valencia 4 , Maria Mar Cobos 4 , Javier Prieto 4 , Javier Luengo 4 , Margarita Martín 4 , Vanesa Pino 4 , Susana López Miguel 4 , Feliciano Garcia 4 , Sonsoles Sancho 4 1 Radiation Oncology Department, Ramon y Cajal Hospital, Madrid, Spain. 2 Biomarkers and therapeutic targets group, IRYCIS, Madrid, Spain. 3 Medical Physics, Ramon y Cajal Hospital, IRYCIS, Madrid, Spain. 4 Radiation Oncology Department, Ramon y Cajal Hospital, IRYCIS, Madrid, Spain Purpose/Objective: Standard abdominal compression systems for Stereotactic Body Radiation Therapy (SBRT) present limitations such as patient discomfort, metallic components causing dosimetry artifacts, and MRI incompatibility. We developed a novel, metal-free immobilization device, the "SBRT-HRC," to overcome these challenges. This prospective study aims to evaluate the efficacy of the SBRT-HRC in controlling tumor motion for thoracic and abdominal lesions
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