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Related Experiment Videos

Control, Correction, and Modeling of Setup Errors and Organ Motion.

Kutcher1, Mageras, Liebel

  • 1Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York, USA

Seminars in Radiation Oncology
|April 1, 1995
PubMed
Summary

Understanding radiotherapy treatment uncertainty is crucial for precision treatments. This review covers patient setup errors and organ motion, exploring strategies to reduce and incorporate these uncertainties into treatment planning.

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Area of Science:

  • Radiation Oncology
  • Medical Physics

Background:

  • Advances in radiotherapy necessitate understanding treatment uncertainties.
  • Quantitative measurements of uncertainties are now possible due to improved imaging and algorithms.
  • New strategies are emerging to reduce and incorporate uncertainties into treatment planning.

Purpose of the Study:

  • To review literature on key uncertainties in photon therapy: patient localization (setup) errors and organ motion.
  • To discuss current approaches for managing these uncertainties.
  • To examine paradigms for incorporating uncertainties into treatment planning.

Main Methods:

  • Literature review of current research on patient setup errors and organ motion in radiotherapy.
  • Analysis of protocols using electronic portal imaging devices for setup error correction.

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  • Discussion of methods for imaging and characterizing organ motion.
  • Review of two approaches for accounting for uncertainties in treatment plans.

    • Main Results:

    • Increasing work on protocols using electronic portal imaging devices to correct patient setup errors.
    • Limited progress in measuring and correcting organ motion due to imaging and characterization difficulties.
    • Two main paradigms for accounting for uncertainties: conventional margin addition and direct incorporation into dose distributions.

    Conclusions:

    • Patient setup errors are increasingly addressed through advanced imaging protocols.
    • Organ motion remains a significant challenge in radiotherapy due to imaging complexities.
    • Both margin-based and dose-distribution-based methods are used to account for treatment uncertainties.