ESTRO 2025 - Abstract Book

S4042

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

ESTRO 2025

Figure 1 Absolut dose measurements to determine the absorption of the dose

Conclusion: The characteristics of the moldable bolus were determined, providing a low-cost material to be used as bolus, which is easy to customize and to use in a clinical setting. These new materials perform better than commercial materials from cost-effectiveness point of view when used in clinical procedures.

Keywords: Radiotherapy, Bolus material, Skin cancer

References: [1] J.A. Diaz-Merchan, S.A. Martinez-Ovalle, H.R. Vega-Carrillo, Characterization of a novel material to be used as bolus in radiotherapy with electrons, Applied Radiation and Isotopes, Volume 183, 2022, 110154, ISSN0969 8043, https://doi.org/10.1016/j.apradiso.2022.110154. [2] Khan, Y., Villarreal-Barajas, J. E., Udowicz, M., Sinha, R., Muhammad, W., Abbasi, A. N., & Hussain, A. (2013). Clinical and dosimetric implications of air gaps between bolus and skin surface during radiation therapy. Journal of Cancer Therapy, 4(7), 1251. DOI: 10.4236/jct.2013.47147

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Digital Poster The volumetric and dosimetric impacts of respiratory motion management in lung SBRT: A systematic review Bonan Zhang 1,2 , Maeve Kearney 2 , Laure Marignol 2 1 Department of Radiation Oncology, National University Cancer Institute Singapore, Singapore, Singapore. 2 Applied Radiation Therapy Trinity, Discipline of Radiation Therapy, School of Medicine, Trinity College Dublin, Dublin, Ireland Purpose/Objective: The efficacy of Stereotactic Body Radiation Therapy (SBRT) in lung cancer relies on accurately accounting for respiratory motion to increase local control and reduce the risk of developing treatment-associated toxicities such as pneumonitis and fibrosis. Several respiratory motion management strategies (active and non-active) have been developed to quantify and account for motion. However, the extent of the volumetric and dosimetric benefit of each strategy, as well as the criteria for selecting the most appropriate strategy for individual patients remain unclear in lung SBRT treatment. This systematic review assesses the extent of target volume reduction and lung dose reduction in lung cancer patients treated with SBRT, comparing active versus non-active respiratory motion management strategies.