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Related Experiment Video

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Using Multilayered Hydrogel Bioink in Three-Dimensional Bioprinting for Homogeneous Cell Distribution
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Enhancing Tissue Equivalence in 7Li Heavy Ion Therapy with MC Algorithm Optimized Polymer-Based Bioinks.

Fatih Ekinci1, Koray Acici2, Tunc Asuroglu3

  • 1Institute of Nuclear Sciences, Ankara University, 06100 Ankara, Turkey.

Journal of Functional Biomaterials
|December 22, 2023
PubMed
Summary

Researchers explored polymeric biomaterials for heavy ion therapy, simulating interactions with lithium-ion beams. Polymethylmethacrylate showed promise as a tissue substitute, with key properties analyzed for treatment applications.

Keywords:
Bragg cureMC algorithmlithium-ion therapypolymeric biomaterialsrecoil

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Area of Science:

  • Medical Physics and Radiation Oncology
  • Biomaterials Science
  • Computational Physics

Background:

  • Heavy ion beams are crucial in tumor therapy due to their precise dose distribution.
  • Accurate dosimetry requires phantoms mimicking human tissue, with polymers being promising substitutes.
  • Understanding beam interactions with biomaterials is essential for safe and effective heavy ion therapy.

Purpose of the Study:

  • To investigate the physical and interaction properties of polymeric biomaterials for heavy ion therapy.
  • To evaluate tissue-equivalent characteristics of polymers using lithium-ion beams.
  • To identify suitable polymer biomaterials for radiological phantom construction in heavy ion treatment planning.

Main Methods:

  • Utilized Monte Carlo Transport of Ions in Matter (Moliere) simulation.
  • Simulated interactions of 7Li (lithium-ion) beams with polymer biomaterials.
  • Analyzed ionization, recoils, phonon release, collision events, and lateral straggle.

Main Results:

  • Polymethylmethacrylate (PMMA) demonstrated a Bragg peak position with a 7.3% difference compared to soft tissue.
  • Average values for recoils, collision events, and lateral straggle were 10.5%, 33%, and 22.6%, respectively.
  • Secondary interactions and linear energy transfer (LET) were analyzed for the 7Li beam.

Conclusions:

  • Polymeric biomaterials, particularly PMMA, show potential as tissue-equivalent materials for heavy ion therapy.
  • The study provides insights into secondary particle interactions and energy deposition relevant to treatment.
  • This research aids in selecting optimal polymer biomaterials for constructing phantoms in heavy ion radiotherapy.