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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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S-values for radium-223 and absorbed doses estimates for 223RACL2 using three computational phantoms.

Catherine C O Silva1, Ademir X da Silva1, Delson Braz1

  • 1Nuclear Engineering Department, Universidade Federal do Rio de Janeiro, Horácio Macedo Ave., 2030, Block G, Technology Center, University City, Fundão Island, 21941-914, Rio de Janeiro, RJ, Brazil.

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Radium-223 dichloride therapy for prostate cancer bone metastases requires accurate dosimetry. This study developed new S-values and evaluated absorbed doses in patient models, finding higher doses in larger individuals.

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Area of Science:

  • Medical Physics
  • Nuclear Medicine
  • Radiotherapy

Background:

  • Radium-223 dichloride (223RaCl2) is an FDA-approved treatment for bone metastases in castration-resistant prostate cancer (CRPC).
  • Current activity prescription for 223RaCl2 therapy does not account for organ-at-risk absorbed dose limits, specifically the bone marrow.
  • Accurate internal dosimetry is crucial for optimizing radionuclide therapy and ensuring patient safety.

Purpose of the Study:

  • To develop a comprehensive set of S-values for Radium-223 and its decay products using validated Monte Carlo simulations.
  • To evaluate absorbed doses in bone marrow for 223RaCl2 therapy across different computational models and biodistributions.
  • To compare absorbed dose estimations in male computational models of varying body weights.

Main Methods:

  • Utilized the GATE Monte Carlo simulation code, validated with the Radioactive Decay Module (RDM).
  • Calculated S-values for Radium-223 and its decay chain using male and female XCAT computational phantoms.
  • Estimated absorbed doses for 223RaCl2 therapy using three male computational models (standard, Pat1, Pat2) and literature-based biodistributions.

Main Results:

  • A comprehensive set of S-values was generated for 30 source and 47 target regions (Male) and 30 source and 42 target regions (Female).
  • Absorbed dose evaluations indicated that the Pat2 phantom (highest body weight) consistently received the greatest absorbed dose in the red marrow across all evaluated biodistributions.
  • The study successfully compared and validated simulation methods for internal dosimetry of 223RaCl2.

Conclusions:

  • The newly calculated S-values will aid in more accurate absorbed dose calculations for Radium-223 therapy.
  • Patient-specific dosimetry, considering anatomical variations and biodistribution, is essential for safe and effective Radium-223 treatment.
  • Larger body weight phantoms (Pat2) exhibited higher red marrow absorbed doses, highlighting the need for individualized dose assessments.