ESTRO 2025 - Abstract Book

S308

Brachytherapy – Head & neck, skin, eye

ESTRO 2025

3529

Digital Poster First Italian use of ImagingRing Mobile for Accurate Applicator Placement for skin cancer brachytherapy. Preliminary results show promising accuracy Mario Petrazzuoli 1 , Federica Gherardi 2 , Eva Iannacone 2 , Buonanno Francesca 2 , Cecilia Arrichiello 2 , Valentina d'Alesio 2 , Marco Gagliardi 2 , Coppola Mariateresa 2 , Mariano Davide 2 , Simone Pezzella 2 , Vincenzo Esposito 2 , Paolo Muto 2 1 radiotherapy, AOU Federico II, Naples, Italy. 2 radiotherapy, IRCCS Pascale, Naples, Italy Purpose/Objective: To assess the accuracy and feasibility of positioning flap applicators for skin cancer patients using a real-time guided imaging system. Material/Methods: Our radiotherapy unit implemented the ImagingRing Mobile system (Elekta ImagingRing v 2.5.2) in late 2023. This innovative system delivers CT imaging directly to the patient, eliminating the need for applicator while enhancing patient comfort and maintaining high image quality.. An analysis was conducted on 35 non-melanoma skin cancer patients treated between November 2023 and novembre 2024. Patients underwent contact HDR-RT with flap applicators and remotely afterloaded Ir-192 sources. Treatment planning was performed using Oncentra brachy 4.6.3.ImagingRing Mobile acquired simulation CT scans. Reference CBCT scans were taken, followed by additional scans every other day. We compared the contoured flaps on the CBCT images to the original treatment plan to assess any variations. Results: An average square error of less than 0.10 cm ensures an optimal fusion. The proper adhesion and placement of the Freiburg were assessed in the axial, coronal, and sagittal views. A total of 152 CBCT scans were obtained and co registered with the planning CBCT. Six patients required treatment replanning. For two patients, the applicator was refitted and the treatment plan was recalculated. Conclusion: The integration of ImagingRing Mobile into the brachytherapy suite enhances patient safety and comfort, improves treatment efficiency, and reduces simulation time by eliminating the need for patient transfers. This technology enables immediate visualization of applicator positioning and precise treatment delivery, facilitating image-guided brachytherapy

Keywords: precise applicator positioning, treatment delivery

3655

Proffered Paper High Dose Rate interstitial brachytherapy for squamous cell carcinoma of the lip: 13 Years of Real-World Data from a single institution Marc Juarez 1 , Marta Méndez 2 , Dina Najjari-Jamal 1 , Andrea Slocker 1 , Pablo Araguas 1 , Isabel Linares 1 , Francisco Pino 3 , Sergio Honorato 3 , Cristina Gullón 3 , Ruth Gracia 3 , Pilar Fernandez 4 , Yasmina Castillo 4 , Joaquina Valera 4 , Joan Pera 1 , Alicia Lozano 1 , Cristina Gutiérrez 1 1 Radiation Oncology, Catalan Institute of Oncology, Barcelona, Spain. 2 Radiation Oncology, Hospital Universitario Virgen de las Nieves, Granada, Spain. 3 Medical Physics, Catalan Institute of Oncology, Barcelona, Spain. 4 Oncology Nursing, Catalan Institute of Oncology, Barcelona, Spain