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Alpha dose modeling in diffusing alpha-emitters radiation therapy. Part II: Lattice studies.

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Hexagonal seed placement is optimal for diffusing alpha-emitters radiation therapy (DaRT) to maximize tumor dose while sparing healthy tissue. This arrangement accounts for uncertainties in tumor parameters and seed placement errors for effective treatment planning.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Nuclear Medicine

Background:

  • Diffusing alpha-emitters radiation therapy (DaRT) utilizes alpha particles for solid tumor treatment.
  • DaRT involves interstitial seeds with 224Ra that release alpha-emitting daughters, spreading via diffusion within the tumor.
  • Accurate alpha dose calculations for DaRT require advanced modeling techniques to account for atom transport.

Purpose of the Study:

  • Extend the simplified diffusion-leakage (DL) model to realistic seed geometries.
  • Utilize single-seed calculations to analyze DaRT seed lattice properties.
  • Provide a pragmatic guide for treatment planning in clinical DaRT trials.

Main Methods:

  • Superposition of single-seed solutions to model alpha dose in DaRT seed lattices.
  • Investigate sensitivity of seed activity and spacing to DL model parameters.
  • Assess impact of seed placement errors on dose distribution.

Main Results:

  • Hexagonal seed placement patterns are favored over square patterns due to rapid dose fall-off, sparing healthy tissue.
  • Variations in seed manufacturing parameters (224Ra activity, daughter emission rates) have minimal impact on lattice spacing.
  • Tumor parameters (diffusion lengths, 212Pb leakage) and seed placement errors significantly affect dose distribution.

Conclusions:

  • Hexagonal lattice spacing of approximately 3.5-4.5 mm with 224Ra seeds is effective.
  • This spacing accommodates uncertainties in tumor environment and seed placement errors.
  • Achieves therapeutically relevant alpha dose levels for solid tumor treatment.