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A Multidisciplinary Approach to Implement Image-Guided Craniospinal Irradiation.

Winnie Li1, Caitlin Gillan1, Cathy Carpino-Rocca2

  • 1Radiation Medicine Program, Princess Margaret Cancer Centre, Toronto, Ontario, Canada; Department of Radiation Oncology, University of Toronto, Toronto, Ontario, Canada.

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Summary

A new 3-isocenter image-guided intensity-modulated radiation therapy (IG-IMRT) technique for craniospinal irradiation (CSI) was developed and validated. This refined CSI method ensures accurate dose delivery and patient safety through a multidisciplinary, image-guided approach.

Keywords:
Craniospinal irradiationIGRTIMRT

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Area of Science:

  • Radiation Oncology
  • Medical Physics

Background:

  • Craniospinal irradiation (CSI) techniques require precise dose delivery to critical structures.
  • Advancements in radiation therapy necessitate the refinement of established treatment modalities.

Purpose of the Study:

  • To report the development and refinement of a 3-isocenter image-guided intensity-modulated radiation therapy (IG-IMRT) technique for CSI.
  • To establish planning and treatment parameters for a novel IG-IMRT CSI approach.

Main Methods:

  • Utilized a multidisciplinary approach for simulation, planning, and delivery.
  • Selected patient immobilization and simulation parameters based on treatment delivery system constraints.
  • Performed commissioning fluence verification and robustness analysis for setup error assessment.
  • Defined isocenter treatment order, imaging frequency, modality, and registration thresholds for image-guided radiation therapy (IGRT).

Main Results:

  • Film and phantom measurements confirmed dose delivery within 3% of planned dose.
  • Setup sensitivity analysis indicated a 3-mm setup tolerance is sufficient.
  • Established a superior, middle, inferior isocenter treatment order based on organ-at-risk proximity.
  • Implemented daily cone-beam computed tomography (CBCT) guidance with specific translational and rotational thresholds.

Conclusions:

  • Successfully developed and implemented an IG-IMRT CSI technique through a collaborative, iterative process.
  • Demonstrated the feasibility of integrating advanced IG-IMRT techniques into clinical practice.
  • Highlighted the importance of a multidisciplinary approach in adopting new radiation therapy technologies.