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SU-E-J-183: Dose Distribution Generated from 131 I Radionuclide Using SPECT-CT.

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This summary is machine-generated.

This study developed a SPECT-CT system to calculate Iodine-131 dose distribution for thyroid cancer treatment. Higher SPECT resolution is crucial for accurate dose calculations in radionuclide therapy.

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Area of Science:

  • Medical Physics
  • Nuclear Medicine
  • Radiotherapy

Background:

  • Iodine-131 (131I) radionuclide therapy is a standard treatment for thyroid cancer.
  • Accurate dose distribution evaluation is lacking despite widespread use.
  • Developing precise dosimetry methods is essential for optimizing treatment outcomes.

Purpose of the Study:

  • To develop a calculation system for 131I dose distribution using SPECT-CT data.
  • To evaluate the impact of image resolution on dose distribution accuracy.
  • To compare dose calculations derived from CT and SPECT imaging.

Main Methods:

  • An acrylic phantom with embedded iodine capsules and glass dosimeters was used.
  • SPECT-CT imaging was performed, acquiring both CT (1.1 mm resolution) and SPECT (4.4 mm resolution) data.
  • The Monte Carlo program PHITS2.0 simulated dose distribution, validated against glass dosimeter measurements.

Main Results:

  • Monte Carlo simulations closely matched experimental measurements (0.3% difference).
  • CT-derived iodine distribution showed finer detail than SPECT due to higher resolution.
  • Dose distribution differences were significant near the source but converged at greater distances.

Conclusions:

  • SPECT-CT data can be utilized to reconstruct 131I dose distributions.
  • Enhancing SPECT image resolution is critical for improving the accuracy of dose calculations.
  • This work highlights the importance of imaging resolution in radionuclide therapy dosimetry.