S1689
Physics - Detectors, dose measurement and phantoms
ESTRO 2026
elastic deformation, with a maximum liver displacement of approximately 3 mm at 5 cm depth under diaphragm compression, followed by rapid relaxation to the neutral position within one second after release.
Conclusion: The PolyJet materials showed radiological properties comparable to human tissues, enabling precise tuning of attenuation from adipose to cortical bone. MRI signal was observed mainly in softer polymers (TissueMatrix, GelMatrix, SUP706), whereas denser formulations produced little signal, limiting MRI applicability. Soft materials exhibited tissue-like elasticity but required rigid encapsulation for stability, which reduced dynamic response. Optimizing print parameters may further improve elasticity and suitability for dynamic radiotherapy phantoms. References: 1(Stratasys J850™ Digital Anatomy™, Stratasys Ltd., Rehovot, Israel)2 Title: RadioMatrix Material Lab Report – EN PolyJet White PaperPublisher: Stratasys Ltd. (Rehovot, Israel) URL: https://stratasysstorage01.file.core.windows.net/porta l10-files-prod/9bff0d18-57c4-4f80-9d37- 20d405a256ad/RadioMatrix Keywords: 3D printing, dynamic, anthropomorphic phantoms Assessment of a novel scintillator detector in an anthropomorphic head phantom for an End-to-end test for stereotactic radiosurgery Andrea Bruschi 1 , Alessandro Ghirelli 1 , Carlotta Mozzi 2 , Claudia Poggiali 1 , Silvia Mazzocchi 1 , Silvia Pini 1 , Filippo Susini 2 , Immacolata Vanore 2 , Michelina Casale 3 , Serenella Russo 1 1 Medical Physics Unit Florence-Empoli, Department of Hospitals Network, Azienda USL Toscana Centro, Florence, Italy. 2 Department of Experimental and Clinical Biomedical Sciences “M. Serio”, University of Florence, Florence, Italy. 3 Medical Physics Unit, Azienda Ospedaliera S.Maria, Terni, Italy Digital Poster 4533
Digital Poster Highlight 4569
Safety Assessment of Radiotherapy in Clinically Relevant Scenarios Involving the Leadless Micra™ Pacemaker Joanna Kamińska 1 , Michał Posiewnik 1 , Maciej Kempa 2 , Lidia Chmielewska-Michalak 3 , Przemysław Mitkowski 3 , Szymon Budrejko 2 , Bartłomiej Tomasik 1,4 1 Department of Oncology and Radiotherapy, Medical University, Gdańsk, Poland. 2 Department of Cardiology and Electrotherapy, Medical University, Gdańsk, Poland. 3 1st Department of Cardiology, University of Medical Sciences, Poznań, Poland. 4 Centre for Experimental Cardiooncology, Medical University, Gdańsk, Poland Purpose/Objective: Leadless pacemakers such as the Micra™ raise new concerns regarding radiotherapy (RT) safety. Current guidelines based on transvenous systems may not reflect the behaviour of fully intracardiac devices. This study aimed to assess the stability and functional integrity of Micra™ pacemakers under clinically relevant and extreme irradiation conditions. Material/Methods: Three Micra™ LCPs (Medtronic, USA) were placed in an anthropomorphic phantom and irradiated with 6 MV FF, 6 MV FFF, and 10 MV FFF photon beams at dose rates of 600–2400 MU/min. Two setups were tested: (i)
Made with FlippingBook - Share PDF online