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Studying Normal Tissue Radiation Effects using Extracellular Matrix Hydrogels
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DPM as a radiation transport engine for PRIMO.

Miguel Rodriguez1,2, Josep Sempau3, Christian Bäumer4,5,6,7

  • 1Centro Médico Paitilla, Calle 53 y ave. Balboa, Panama City, Panama.

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The Dose Planning Method (DPM) is now an efficient and accurate Monte Carlo engine for PRIMO, offering faster dose calculations for radiation therapy while maintaining high accuracy in most materials.

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Linear acceleratorMonte CarloRadiation transport

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Area of Science:

  • Medical Physics
  • Computational Dosimetry
  • Radiation Oncology

Background:

  • PRIMO, a dose verification system, traditionally uses the PENELOPE Monte Carlo code, known for accuracy but limited computational efficiency.
  • Fast Monte Carlo codes like the Dose Planning Method (DPM) offer potential improvements in speed.

Purpose of the Study:

  • Adapt DPM as an alternative computation engine within the PRIMO system.
  • Validate DPM's performance against PENELOPE in terms of accuracy and simulation time.
  • Assess DPM's suitability for specific clinical scenarios and dynamic treatments.

Main Methods:

  • Parallelized and modified DPM to handle quadric geometries for linac simulations, enabling dynamic treatment modeling.
  • Benchmarked DPM against PENELOPE using phantom irradiations (multi-layer, water phantom with MLC) and four clinical cases.
  • Employed gamma index analysis (1 mm/1% criteria) for dose distribution comparisons, including 3D analysis for clinical cases.

Main Results:

  • Over 99% of voxels passed gamma criteria for phantom cases, except for transport through air where dose differences reached 24%.
  • Clinical cases also demonstrated over 99% gamma index pass rates.
  • DPM achieved speedup factors ranging from 2.5x to 11.8x compared to PENELOPE, with potential for 25x speedup using smaller voxel sizes.

Conclusions:

  • DPM successfully integrated into PRIMO as an efficient and accurate Monte Carlo engine for dose estimation.
  • DPM enables integrated simulation of linac and patient geometry for static and dynamic treatments.
  • Observed discrepancies in air are attributed to cross-section interpolation artifacts and do not impact results in other materials.