ESTRO meets Asia 2024 - Abstract Book

S303

Physics – Detectors, dose measurement and phantoms

ESTRO meets Asia 2024

Compared to the original automated plan, the plan quality is effectively improved in the adjusted automated plan, which is more conducive to the protection of OARs. Additionally, the complexity of the automated plan is lower compared to the manual plan.

Keywords: VMAT, Auto-planning, Dosimetric parameter

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Digital Poster

Dose measurements and design implementation of 3D-Printed Bolus for enhanced radiotherapy precision

Andreea-Cosmina Ciobanu 1,2 , Lucian Cristian Petcu 1,3 , Adina Petcu 1,4 , Petruta Mutescu 1 , Florin Costache 5,1

1 Radiotherapy Department, Ovidius Clinical Hospital, Constanta, Romania. 2 Faculty of Physics, Babes-Bolyai University, Cluj-Napoca, Romania. 3 Faculty of Medicine, Ovidius University, Constanta, Romania. 4 Faculty of Pharmacy, Ovidius University, Constanta, Romania. 5 Radiotherapy Department, Sf. Nectarie Center, Craiova, Romania

Purpose/Objective:

The aim of this study is to investigate the feasibility and efficacy of utilizing surface topography derived from a computed tomography (CT) scan of an anthropomorphic phantom to create a 3D-printed bolus for radiotherapy treatments. The primary objectives of this research are twofold: to establish a systematic process for accurately converting CT scan data into a 3D printable format and to assess the potential benefits of using customized boluses to reduce air gaps for treatment precision, optimize dose delivery, and ultimately contribute to better patient outcomes in radiotherapy.

Material/Methods:

The initial phase of the study involved the conversion of 2D image layers obtained from the DICOM phantom scan into a 3D file format utilizing 3D Slicer software. Subsequently, the 3D model was meticulously refined in Autodesk Fusion 360 to craft the bolus geometry, which was then exported as a stereolithography (STL) file for subsequent 3D printing. Four sets of CT scans and treatment plans were analyzed using BeOSL detectors to compare the measured dose from linear accelerator irradiation with the calculated dose from the treatment planning system (TPS). The reference treatment plan featured a virtual bolus intricately attached to the fields, while the other plans comprehensively encompassed a skinless commercial bolus, a thermoplastic commercial bolus, and a 3D-printed bolus. The successful development and evaluation of the 3D-printed bolus utilizing surface topography resulting from the CT scan underscores the immense potential of personalized bolus fabrication in the realm of radiotherapy.

Results:

A comprehensive analysis of the study findings revealed that the 3D-printed bolus exhibited closely aligned attenuation properties when compared to the commercial boluses that were tested. Furthermore, the material employed for the 3D printing of the bolus was deemed highly suitable for clinical applications, considering the physical properties of the filament. By incorporating state-of-the-art technology and precise data analysis, the fabricated bolus demonstrated exceptional conformity to the phantom anatomy, with dosimetry measurements