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This study analyzes radiation interaction parameters in 3D printing thermoplastics. Adding specific elements can improve these materials for use as water substitutes in radiotherapy and radiology.

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Area of Science:

  • Medical Physics
  • Materials Science
  • Radiological Physics

Background:

  • 3D printing is increasingly used in radiotherapy and radiology.
  • Limited knowledge exists on the radiological properties of 3D printing materials.
  • Understanding radiation interaction in these materials is crucial for new applications.

Purpose of the Study:

  • Analyze key radiation interaction parameters in Fused Deposition Modeling thermoplastics.
  • Propose methods to enhance thermoplastic properties for water substitution.
  • Facilitate use of 3D printed materials in radiodiagnosis, external radiotherapy, and brachytherapy.

Main Methods:

  • Calculated mass linear attenuation and mass energy absorption coefficients.
  • Determined stopping power and electronic density for various thermoplastics.
  • Utilized NIST XCOM and ESTAR databases, alongside EGSnrc Monte Carlo simulations.

Main Results:

  • Established relationships between material properties and elemental composition.
  • Identified potential improvements for polymers based on commercial water substitutes.
  • Demonstrated that radiological characteristics can be tuned via material composition.

Conclusions:

  • Thermoplastic radiological properties can be enhanced by incorporating elements with higher atomic numbers than oxygen.
  • Developing new blends, particularly with polyethylene, can improve water substitution capabilities.
  • Optimized 3D printing materials hold promise for advanced medical imaging and radiation therapy applications.