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Updated: Oct 5, 2025

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AAPM Task Group Report 290: Respiratory motion management for particle therapy.

Heng Li1, Lei Dong2, Christoph Bert3

  • 1Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University, Baltimore, Maryland, USA.

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Respiratory motion causes dose uncertainty in particle therapy for thoracic and abdominal tumors. This report offers guidance on motion management techniques, quality assurance, and future strategies for accurate and safe particle beam delivery.

Keywords:
motion managementparticle therapy

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Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Respiratory motion introduces significant dose uncertainty in particle therapy for thoracic and abdominal tumors.
  • Accurate dose delivery is critical for effective treatment and minimizing side effects.

Purpose of the Study:

  • To review the impact of tumor motion on dosimetry in particle radiotherapy.
  • To provide guidance on current and emerging motion management techniques and quality assurance procedures.

Main Methods:

  • Review of current literature and existing AAPM reports (e.g., TG76).
  • Analysis of dosimetric considerations for different particle beam delivery modes (passive scattering, uniform scanning, pencil-beam scanning).
  • Risk analysis for quality assurance of motion management procedures.

Main Results:

  • Identified key challenges and limitations in current motion management techniques.
  • Provided recommendations for facility-specific dosimetric characterization, motion assessment, treatment planning, and image guidance.
  • Highlighted the importance of standard operating procedures and a risk-based approach to quality management.

Conclusions:

  • Implementing robust motion management strategies is crucial for safe and accurate particle therapy.
  • Facilities must conduct thorough planning studies and adopt a risk-based methodology for quality management.
  • Continued development of motion management techniques and vendor recommendations are essential for advancing particle therapy.