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S values for radionuclides localized within the skeleton.

L G Bouchet1, W E Bolch, R W Howell

  • 1Department of Nuclear and Radiological Engineering, University of Florida, Gainesville 32611-8300, USA.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|January 27, 2000
PubMed
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This study presents a new model for calculating radiation dose to active marrow and endosteum in the adult skeleton. The model provides radionuclide S values crucial for accurate dosimetry in nuclear medicine and radionuclide therapies.

Area of Science:

  • Medical Physics
  • Radiological Dosimetry
  • Nuclear Medicine

Background:

  • Accurate radiation dose calculations are vital for radionuclide therapies and diagnostic procedures.
  • Previous models assessed absorbed fractions to marrow and endosteum in bone.
  • Effective dose calculations require skeletal endosteum dose assessment.

Purpose of the Study:

  • To extend previous calculations to the assignment of radionuclide S values for the adult skeleton.
  • To develop a fully documented model for radionuclide dosimetry of the skeleton.
  • To provide site-specific radionuclide S values for various skeletal sites and source-target combinations.

Main Methods:

  • Utilized data from International Commission on Radiological Protection Publication 70 for skeletal tissue masses.

Related Experiment Videos

  • Employed 3D electron transport models to determine electron absorbed fractions.
  • Calculated radionuclide S values using the MIRD schema for 11 specific radionuclides, focusing on trabecular active marrow.

    • Main Results:

    • Reported site-specific radionuclide S values for 22 skeletal sites.
    • Provided S values for 9 source-target combinations in trabecular bone and 6 in cortical bone.
    • Presented skeletal-averaged S values.

    Conclusions:

    • A comprehensive model for adult skeletal dosimetry is presented, integrating international recommendations and 3D transport calculations.
    • Comparisons with existing MIRD and MIRDOSE datasets highlight variations attributable to target mass assumptions, transport models, and marrow modeling.
    • The model offers improved accuracy for radionuclide S values in skeletal dosimetry.