ESTRO 2023 - Abstract Book

S1592

Digital Posters

ESTRO 2023

using MJF. The surfaces of these immobilizers were captured using optical structured light imaging allowing a spatial comparison with the intended design. Results Dosimetric measurements indicate that the PA12 light material provides a 15% dose reduction compared to other MJF printable options. The metamaterial designs provide dose reductions relative to status quo stretched thermoplastics of up to 40%. Printed immobilizers showed spatial fidelity with 97% of sampled points on the surface within +/- 2mm of the design.

Conclusion Immobilizers printed with Multi Jet Fusion are a promising new technology allowing automation, control over the fabrication process, as well as significant lowering of skin dose through selection of preferred materials and metamaterial design.

PO-1853 Image-guided IORT after surgical resection of brain malignancies: a feasibility study

G.R. Sarria 1 , M. Grimmer 1 , M. Hamed 2 , M. Banat 2 , D. Koch 1 , H. Lorenzana 2 , M. Fiebich 3 , J.A. Holz 1 , C. Schmeel 4 , A. Kowark 5 , L.C. Schmeel 1 , S. Garbe 1 1 University Hospital Bonn, Radiation Oncology, Bonn, Germany; 2 University Hospital Bonn, Neurosurgery, Bonn, Germany; 3 Technische Hochschule Mittelhessen, Bachelorstudiengang Medizinische Physik und Strahlenschutz, Giessen, Germany; 4 University Hospital Bonn, Neuroradiology, Bonn, Germany; 5 University Hospital Bonn, Neurosurgical Anesthesiology, Bonn, Germany