ESTRO 2024 - Abstract Book

S5609

RTT - Patient care, preparation, immobilisation and IGRT verification protocols

ESTRO 2024

patient breathing during left breast RT. The consequential increase in delivery time was deemed manageable by the RTT team and constituted a tolerable workload. The role of the RTT is therefore crucial in the implementation of new technologies for improving the quality of patient care.

Keywords: DIBH, visual coach, left breast RT

References:

[1] Stranzl H, Zurl B. Postoperative irradiation of left-sided breast cancer patients and cardiac toxicity. Does deep inspiration breath-hold (DIBH) technique protect the heart?. Strahlenther Onkol. 2008;184(7):354-358. doi:10.1007/s00066-008-1852-0 [2] Russo S, Esposito M, Hernandez V, et al. Does deep inspiration breath hold reduce plan complexity? Multicentric experience of left breast cancer radiotherapy with volumetric modulated arc therapy. Phys Med. 2019;59:79-85. doi:10.1016/j.ejmp.2019.02.018

2765

Proffered Paper

Total Marrow Irradiation: Impact of reduced CT-to-delivery time on dose and positioning accuracy

Claudia Sopranzi 1,2 , Nicola Lambri 2,3 , Damiano Dei 2,3 , Giuseppe Spataro 2,3 , Aurora Zucca 2,3 , Ciro Franzese 2,3 , Carmela Galdieri 3 , Stefano Tomatis 3 , Marta Scorsetti 2,3 , Pietro Mancosu 3 1 Centro Nazionale di Adroterapia Ocologica - CNAO, Radiation Oncology Unit, Pavia, Italy. 2 Humanitas University, Department of Biomedical Sciences, Milan, Italy. 3 IRCCS Humanitas Research Hospital, Radiotherapy and Radiosurgery Department, Milan, Italy

Purpose/Objective:

Total Marrow (lymph-node) Irradiation (TMI) is a challenging technique employed in the treatment of hematopoietic malignancies to irradiate the hematopoietic tissues while sparing nearby organs at risk, with the primary goal of reducing toxicities associated with total body irradiation [1]. Due to the complexity of optimizing the treatment plan, TMI typically takes several days, leading to the simulation CT being performed more than 15 days before treatment (CT-15). In this study, we evaluated the possible benefit of performing a CT with reduced CT-to-delivery timeframes, an approach directly impacting Radiotherapy Technologists (RTTs) in their workflow and patient care.

Material/Methods:

Since 2010, our center has treated 126 patients with TMI using volumetric modulated arc therapy (VMAT) based on the simulation CT-15 using a personalized immobilization system developed by the RTTs team [2]. Plans were