ESTRO 2024 - Abstract Book

S1687

Clinical - Lung

ESTRO 2024

bleeding. Results from prospective studies are awaited to clarify the optimal dose fractionation and constraints for critical OARs such as the trachea, mainstem bronchus and esophagus.

Keywords: Ultra-central, SBRT, Lung

References:

1. Lindberg, K., Grozman, V., Karlsson, K., Lindberg, S., Lax, I., Wersäll, P., Persson, G.F., Josipovic, M., Khalil, A.A., Moeller, D.S., Nyman, J., Drugge, N., Bergström, P., Olofsson, J., Rogg, L.V., Ramberg, C., Kristiansen, C., Jeppesen, S.S., Nielsen, T.B. and Lödén, B. (2021). The HILUS-Trial-a Prospective Nordic Multicenter Phase 2 Study of Ultracentral Lung Tumors Treated With Stereotactic Body Radiotherapy. Journal of Thoracic Oncology: Official Publication of the International Association for the Study of Lung Cancer, [online] 16(7), pp.1200 – 1210. doi:https://doi.org/10.1016/j.jtho.2021.03.019. 2. J. Lodeweges, S.N, P., Bartels, M., Anne, Pomp, J., Peters, M. and Joost J.C. Verhoeff (2021). Ultra-central lung tumors: safety and efficacy of protracted stereotactic body radiotherapy. Acta Oncologica, 60(8), pp.1061 – 1068. doi:https://doi.org/10.1080/0284186x.2021.1942545. 3. Giuliani, M., Ashwathy Susan Mathew, Houda Bahig, Bratman, S.V., Filion, É., Glick, D., Louie, A.V., Raman, S., Anand Swaminath, Warner, A., Yau, V. and Palma, D.A. (2018). SUNSET: Stereotactic Radiation for Ultracentral Non – Small-Cell Lung Cancer — A Safety and Efficacy Trial. Clinical Lung Cancer, 19(4), pp.e529 – e532. doi:https://doi.org/10.1016/j.cllc.2018.04.001.

1645

Digital Poster

Efficacy and Safety of Respiratory Motion Management using CPAP in Lung SABR: A Prospective Trial

Jung Bin Park 1,2 , Kyung Su Kim 1 , Joo Ho Lee 1 , Ji Hyun Chang 1,2 , Jaeman Son 1 , Seho Kwon 3 , Hyun-Woo Shin 4 , Hak Jae Kim 1,2 1 Seoul National University Hospital, Radiation Oncology, Seoul, Korea, Republic of. 2 Seoul National University College of Medicine, Radiation Oncology, Seoul, Korea, Republic of. 3 Seoul National University Hospital, Transitional Year Internship, Seoul, Korea, Republic of. 4 Seoul National University College of Medicine, Obstructive Upper Airway Research Laboratory, Seoul, Korea, Republic of

Purpose/Objective:

Respiratory motion increases the uncertainty of target volume delineation of lung tumors in the lower lobes, resulting in an enlargement of the internal target volume and potential tumor overlap with the diaphragm in four dimensional (4D) CT images. This study aimed to evaluate the impact of facilitating target delineation and the safety