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A GPU-based finite-size pencil beam algorithm with 3D-density correction for radiotherapy dose calculation.

Xuejun Gu1, Urszula Jelen, Jinsheng Li

  • 1Center for Advanced Radiotherapy Technologies and Department of Radiation Oncology, University of California San Diego, La Jolla, CA 92037-0843, USA.

Physics in Medicine and Biology
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Summary

A new graphics processing unit (GPU)-based dose engine improves online adaptive radiotherapy accuracy using a 3D-density corrected finite-size pencil beam (FSPB) algorithm. This method enhances dose calculations for intensity-modulated radiation therapy (IMRT) replanning.

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Computational Biology

Background:

  • Online adaptive radiotherapy requires accurate and efficient dose calculation engines.
  • Existing finite-size pencil beam (FSPB) algorithms have limitations in accuracy.
  • Graphics processing unit (GPU) acceleration offers potential for faster computations.

Purpose of the Study:

  • To develop and evaluate an accurate and efficient GPU-based dose calculation engine for online adaptive radiotherapy.
  • To implement a 3D-density correction method within an FSPB algorithm for improved accuracy.
  • To assess the computational efficiency and dosimetric performance of the new algorithm.

Main Methods:

  • Implemented a finite-size pencil beam (FSPB) algorithm with 3D-density correction on a GPU.
  • Utilized an ultrafast FSPB computational framework.
  • Performed dosimetric evaluations against Monte Carlo dose calculations on ten IMRT treatment plans (head-and-neck and lung cases).

Main Results:

  • The 3D-density correction significantly improved dose calculation accuracy compared to the conventional FSPB algorithm across all evaluated cases.
  • Dose calculation for IMRT plans was completed within 1 second for most cases, demonstrating high efficiency.
  • The new GPU-based FSPB algorithm showed improved accuracy at a slight cost to computational efficiency (5-15% slower).

Conclusions:

  • The GPU-based FSPB algorithm with 3D-density correction provides accurate and efficient dose calculations for online adaptive radiotherapy.
  • This enhanced algorithm is suitable for online intensity-modulated radiation therapy (IMRT) replanning, improving treatment precision.
  • The integration of 3D-density correction represents a significant advancement in radiotherapy dose calculation technology.