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A practical method for quantifying dose in bone and lung using TLDs when using 6 and 15 MV photon beams.

Neslihan Sarigul1,2, Murat Surucu3,2, Chester Reft4

  • 1Institute of Nuclear Science, Hacettepe University, 06532 Ankara, Turkey.

Physics in Medicine and Biology
|February 7, 2020
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Summary

This study introduces a practical method to convert thermoluminescent dosimeter (TLD) measurements to lung and bone doses using Monte Carlo simulations. The new method accurately quantifies radiation dose in different tissues, improving treatment planning.

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Computational Biology

Background:

  • Accurate radiation dose quantification in different tissues is crucial for effective radiotherapy.
  • Thermoluminescent dosimeters (TLDs) are widely used for dose measurement but require correction factors for different media.
  • Existing methods for dose conversion in tissues like lung and bone have limitations.

Purpose of the Study:

  • To develop and validate a practical method for converting TLD-measured dose to dose in lung and bone for 6 MV and 15 MV photon beams.
  • To compare Monte Carlo (MC) simulations with Burlin cavity theory for dose conversion factors.
  • To improve the accuracy of dose quantification in heterogeneous phantoms.

Main Methods:

  • Monte Carlo (MC) simulations and Burlin cavity theory were used to calculate dose-to-TLD to dose-to-medium conversion factors ([Formula: see text]).
  • A practical method was proposed using TLD calibration in water and a dose-to-medium to dose-to-water conversion factor.
  • Phantoms with bone or lung equivalent slabs were used for experimental verification, with percent depth dose (PDD) curves measured using TLD-100 dosemeters.

Main Results:

  • MC-calculated [Formula: see text] factors for bone and lung were within 3% of spectrum-weighted theoretical values.
  • PDD curves corrected using the proposed method agreed within 1.5% of MC simulations for water/lung/water and water/bone/water phantoms.
  • The dose-to-medium correction using MC-simulated [Formula: see text] was found to be convenient, easy, and accurate.

Conclusions:

  • The proposed practical method for dose conversion using MC-simulated [Formula: see text] factors is accurate and reliable.
  • This method offers a significant improvement over Burlin cavity theory, particularly for high atomic number materials like bone.
  • The findings support the use of MC simulations for precise dose quantification in radiotherapy, especially in heterogeneous media.