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Dose indicator for CyberKnife image-guided radiation therapy.

Raphaël Moeckli1, Antoine Baillod1, Dora Gibellieri1

  • 1Institute of Radiation Physics, Lausanne University Hospital, Rue du Grand-Pré 1, CH-1007, Lausanne, Switzerland.

Medical Physics
|February 21, 2020
PubMed
Summary

This study calculated effective doses and risks from CyberKnife image-guided radiation therapy (IGRT) across various treatment sites. Results show effective doses comparable to other IGRT methods, except in specific thorax cases.

Keywords:
CyberKnifeIGRTeffective doseorgan doserisk

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiological Imaging

Background:

  • Image-guided radiation therapy (IGRT) enhances treatment precision.
  • CyberKnife systems utilize advanced imaging for accurate patient positioning.
  • Understanding radiation dose and associated risks is crucial for patient safety.

Purpose of the Study:

  • To calculate dose distributions from CyberKnife IGRT for brain, head and neck (H&N), lung, and pelvis regions.
  • To determine the effective dose and estimate the radiation-related risk for these treatment areas.
  • To compare calculated doses with existing data and other IGRT modalities.

Main Methods:

  • Developed and validated a CyberKnife IGRT kV beam model in a treatment planning system.
  • Contoured patient CTs for brain, H&N, thorax, and pelvis treatment regions.
  • Calculated dose distributions, effective dose (ICRP 103), and risk factors; measured Entrance Surface Dose (ESD).

Main Results:

  • Maximum effective doses per fraction: 0.8 mSv (brain), 1.9 mSv (H&N), 20.2 mSv (pelvis), 42.4 mSv (thorax).
  • Corresponding risk estimates: 0.004% (brain), 0.01% (H&N), 0.1% (pelvis), 0.2% (thorax).
  • Calculated ESD values were consistent with existing data.

Conclusions:

  • Validated CyberKnife IGRT kV beam models in a clinical treatment planning system.
  • Determined effective dose and risk estimates for CyberKnife IGRT across multiple treatment sites.
  • CyberKnife IGRT effective doses are comparable to conventional C-arm linac CBCT protocols, barring extreme thorax irradiation conditions.