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GPU-based ultra-fast dose calculation using a finite size pencil beam model.

Xuejun Gu1, Dongju Choi, Chunhua Men

  • 1Department of Radiation Oncology, University of California San Diego, La Jolla, CA 92037-0843, USA.

Physics in Medicine and Biology
|October 2, 2009
PubMed
Summary

This study introduces a fast dose calculation engine using graphics processing units (GPUs) for online adaptive radiation therapy (ART). The GPU-accelerated finite-size pencil beam (FSPB) algorithm enables rapid dose calculations, crucial for real-time treatment adjustments.

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Area of Science:

  • Medical Physics
  • Computational Biology
  • Radiotherapy Technology

Background:

  • Online adaptive radiation therapy (ART) aims to optimize cancer treatment by adapting to daily anatomical changes.
  • Realizing ART is hindered by the technical challenge of rapid dose calculation for intensity-modulated radiation therapy (IMRT) plan optimization.
  • Graphics processing units (GPUs) offer parallel processing capabilities suitable for accelerating complex dose calculations.

Purpose of the Study:

  • To develop and evaluate a GPU-based dose calculation engine for online adaptive radiation therapy.
  • To assess the performance of a finite-size pencil beam (FSPB) algorithm implemented on a GPU framework for IMRT planning.
  • To determine the feasibility of GPU acceleration for real-time dose deposition coefficient calculations.

Main Methods:

  • Developed a dose calculation engine utilizing a finite-size pencil beam (FSPB) algorithm integrated with a GPU parallel computing framework.
  • The framework was designed to be flexible, accommodating various FSPB models.
  • Performance was evaluated using a water phantom and a prostate cancer patient case, comparing GPU execution times against a CPU.

Main Results:

  • Achieved significant speedups ranging from 200 to 400 times compared to a conventional CPU using an NVIDIA Tesla C1060 GPU.
  • Demonstrated that dose deposition coefficients for a nine-field prostate IMRT plan could be calculated in under 1 second.
  • The GPU-based FSPB algorithm proved highly efficient across various beamlet and voxel sizes.

Conclusions:

  • The GPU-based FSPB dose calculation engine significantly accelerates computations required for online IMRT planning.
  • This technology is well-suited for enabling real-time re-planning in adaptive radiotherapy workflows.
  • The developed framework represents a critical step towards the clinical implementation of online adaptive radiation therapy.