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Towards 3D printed multifunctional immobilization for proton therapy: Initial materials characterization.

Steven Michiels1, Antoine D'Hollander2, Nicolas Lammens3

  • 1Department of Oncology, Laboratory of Experimental Radiotherapy, KU Leuven - University of Leuven, Herestraat 49, Leuven 3000, Belgium.

Medical Physics
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Summary

3D printing offers customizable patient immobilization for proton therapy, merging immobilization and range shifting functions. Characterizing materials reveals diverse mechanical and radiological properties suitable for radiation therapy applications.

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Area of Science:

  • * Medical Physics
  • * Materials Science
  • * Radiation Oncology

Background:

  • * Patient-specific immobilization is crucial for precise radiation delivery.
  • * Integrating immobilization with treatment planning functions (e.g., bolus effects) can enhance efficiency.
  • * 3D printing offers potential for creating complex, customized devices for radiation therapy.

Purpose of the Study:

  • * To characterize 3D printed materials for patient immobilization in proton therapy.
  • * To evaluate structural, radiological, and radiation-induced properties of 3D printed materials.
  • * To assess the feasibility of using 3D printing for multifunctional immobilization devices.

Main Methods:

  • * Eight materials were 3D printed using four techniques and tested.
  • * Geometric accuracy, mechanical response (Young's modulus), and radiation effects (up to 100 Gy) were assessed.
  • * Dual-energy computed tomography (DECT) determined relative electron density (ρe), effective atomic number (Zeff), and proton stopping power ratio (SPR); validated with beam measurements.

Main Results:

  • * Young's moduli varied widely (0.6–2940 MPa); mechanical properties were stable post-irradiation.
  • * DECT yielded Zeff (5.91–10.43) and SPR/ρe (0.6–1.22).
  • * Proton range shifting showed orientation dependence for some materials, unlike photon attenuation.

Conclusions:

  • * 3D printing enables selection of diverse mechanical and radiological properties for immobilization.
  • * Hybrid DECT methods facilitate in-house quality assurance of 3D printed components for radiation therapy.
  • * This study provides foundational data for developing 3D printed, multifunctional immobilization solutions.