ESTRO 2024 - Abstract Book

S4014

Physics - Inter-fraction motion management and offline adaptive radiotherapy

ESTRO 2024

Keywords: Exit Dosimetry, Adaptive, Dose Deformation

References:

1.Brock KK, Mutic S, McNutt TR, Li H, Kessler ML. Use of image registration and fusion algorithms and techniques in radiotherapy: Report of the AAPM Radiation Therapy Committee Task Group No. 132. Medical physics. 2017 Jul;44(7):e43-76. 2.Graves YJ, Smith AA, McIlvena D, Manilay Z, Lai YK, Rice R, Mell L, Jia X, Jiang SB, Cerviño L. A deformable head and neck phantom with in ‐ vivo dosimetry for adaptive radiotherapy quality assurance. Medical physics. 2015 Apr;42(4):1490-7. 3.Ayyalusamy A, Vellaiyan S, Shanmugam S, Ilamurugu A, Gandhi A, Shanmugam T, Murugesan K. Feasibility of offline head & neck adaptive radiotherapy using deformed planning CT electron density mapping on weekly cone beam computed tomography. The British journal of radiology. 2017 Jan;90(1069):20160420. 4.Veiga C, McClelland J, Moinuddin S, Lourenço A, Ricketts K, Annkah J, Modat M, Ourselin S, D'Souza D, Royle G. Toward adaptive radiotherapy for head and neck patients: feasibility study on using CT ‐ to ‐ CBCT deformable registration for “dose of the day” calculations. Medical physics. 2014 Mar;41(3):031703.

1139

Digital Poster

Fully automated adaptive workflow for H&N treatments with a conventional linear accelerator

Gaia Muti 1,2 , Marco MJ Felisi 2 , Angelo F Monti 2 , Roberto Pellegrini 3 , Chiara Carsana 4 , Mauro Palazzi 4 , Paola E Colombo 2

1 Università di Milano, Fisica, Milano, Italy. 2 ASST GOM Niguarda, Fisica sanitaria, Milano, Italy. 3 Elekta AB, Medical Affairs, Stockholm, Italy. 4 ASST GOM Niguarda, Radioterapia, Milano, Italy

Purpose/Objective:

Online Adaptive Radiotherapy (ART) aims to enhance treatment accuracy by reducing setup uncertainties and improving target localisation. Head and neck cancer is a technically challenging site where anatomical and positional changes during treatment sessions are frequent. ART can assess this challenge. Using CBCT for online ART is a dynamic and iterative treatment process. It requires fast image acquisition, quick outlining of all relevant OARs and targets, and rapid plan creation. This can be better accomplished by embedding automated methods such as auto contouring and auto-planning within the ART workflow. The use of CBCT images for adaptive planning is a topic that has been explored for several years now, but the innovation lies in the online implementation of this technique. Currently, this topic is gaining considerable interest, especially due to the introduction of systems that facilitate, automate, and expedite the various steps involved in the process. We managed to exploit auto-contouring and auto-