ESTRO 2024 - Abstract Book

S3686

Physics - Dose prediction, optimisation and applications of photon and electron planning

ESTRO 2024

5. Duriseti S, Kavanaugh JA, Szymanski J, et al. LITE SABR M1: A phase I trial of Lattice stereotactic body radiotherapy for large tumors. Radiother Oncol J Eur Soc Ther Radiol Oncol. 2022;167:317-322. doi:10.1016/j.radonc.2021.11.023

6. Iori F, Botti A, Ciammella P, et al. How a very large sarcomatoid lung cancer was efficiently managed with lattice radiation therapy: a case report. Ann Palliat Med. 2022;11(11):3555-3561. doi:10.21037/apm-22-246

7. Dincer N, Ugurluer G, Korkmaz L, et al. Magnetic Resonance Imaging-Guided Online Adaptive Lattice Stereotactic Body Radiotherapy in Voluminous Liver Metastasis: Two Case Reports. Cureus. 2022;14(4):e23980. doi:10.7759/cureus.23980 8. Pollack A, Chinea FM, Bossart E, et al. Phase I Trial of MRI-Guided Prostate Cancer Lattice Extreme Ablative Dose (LEAD) Boost Radiation Therapy. Int J Radiat Oncol Biol Phys. 2020;107(2):305-315. doi:10.1016/j.ijrobp.2020.01.052 9. Price AT, Schiff JP, Zhu T, et al. First treatments for Lattice stereotactic body radiation therapy using magnetic resonance image guided radiation therapy. Clin Transl Radiat Oncol. 2023;39:100577. doi:10.1016/j.ctro.2023.100577 10. Wu B, Pang D, Simari P, Taylor R, Sanguineti G, McNutt T. Using overlap volume histogram and IMRT plan data to guide and automate VMAT planning: a head-and-neck case study. Med Phys. 2013;40(2):021714. doi:10.1118/1.4788671

11. Duriseti S, Kavanaugh J, Goddu S, et al. Spatially fractionated stereotactic body radiation therapy (Lattice) for large tumors. Adv Radiat Oncol. 2021 Jan 8;6(3):100639.

2633

Digital Poster

BlockSoft - A software tool for 3D-Printed divergent moulds for electron apertures and photon blocks

Jonas Ringholz, Florian Exner, Adriana Salazar Hammann, Ralf Schmitt, Klaus Bratengeier, André Toussaint

University Hospital Würzburg, Department of Radiation Oncology, Würzburg, Germany

Purpose/Objective:

Electron apertures and photon blocks have been manufactured in Styrofoam moulds for decades. MLC makes this unnecessary in most cases. Only special techniques still require precise and individual photon blocks and electron apertures. For these cases, milling machines are too expensive and hot-wire cutting is not exact enough. We present a 3D printing method.

Material/Methods:

A 3D printing workflow was developed and tested for clinical routine and accuracy. An open source software tool (BlockSoft) was programmed to provide a fast and convenient solution to create 3D object files in .stl format ready for a 3D printer toolpath generation software (Ultimaker “Cura 5.4”). BlockSoft was written in Python (version 3.10)