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Related Experiment Videos

The clinical implications of the collapsed cone planning algorithm.

C Irvine1, A Morgan, A Crellin

  • 1Medical Physics Department, Cookridge Hospital, Leeds, UK. Catherine.Irvine@leedsth.nhs.uk

Clinical Oncology (Royal College of Radiologists (Great Britain))
|April 13, 2004
PubMed
Summary

The collapsed cone (CC) algorithm in Helax-TMS may lead to under-dosage and less homogeneous dose distributions compared to the pencil beam (PB) algorithm. This highlights challenges in meeting clinical dose requirements for radiotherapy planning.

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Area of Science:

  • Medical Physics
  • Radiotherapy Treatment Planning
  • Computational Dosimetry

Background:

  • Accurate dose distributions are critical in radiotherapy.
  • The Helax-TMS pencil beam (PB) algorithm is widely used.
  • The Helax-TMS collapsed cone (CC) algorithm is theoretically more accurate in heterogeneous regions.

Purpose of the Study:

  • To compare dose delivery accuracy between Helax-TMS PB and CC algorithms.
  • To evaluate the clinical acceptability of PB plans using CC as a reference.
  • To assess dose homogeneity and target coverage in radiotherapy planning.

Main Methods:

  • Recalculated 30 PB treatment plans (lung, oesophageal) using the CC algorithm.
  • Compared monitor units, dose distributions, and target volume coverage.

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  • Assessed International Commission on Radiation Units and Measurements (ICRU) homogeneity requirements.

    • Main Results:

    • Monitor units differed by up to 3.4%, with CC often calculating more.
    • CC algorithm indicated potential under-dosage at prescription points.
    • Minimum dose to planning target volume (PTV) was lower with CC, by up to 23.2%.
    • ICRU homogeneity requirements were not met in any case.

    Conclusions:

    • The CC algorithm has limitations for routine clinical use.
    • It serves as a benchmark for evaluating new dose algorithms.
    • Consideration of dose homogeneity is crucial before Monte Carlo-based models.