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Michael F Moyers1, Wei Ren1

  • 1Department of Medical Physics, Shanghai Proton and Heavy Ion Center, Shanghai Key Laboratory of Radiation Oncology (20dz2261000), Shanghai Engineering Research Center of Proton and Heavy Ion Radiation Therapy, Shanghai 201315, China.

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This study developed rotating patient pods to enhance beam entry for stationary gantries in light ion therapy. This innovation aims to match the solid angle capabilities of rotating gantries, improving treatment precision.

Keywords:
GantryIonPodProton

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Biomedical Engineering

Background:

  • Stationary gantries in light ion therapy have limitations in beam entry solid angle.
  • Achieving a larger solid angle is crucial for optimizing treatment delivery and patient positioning.

Purpose of the Study:

  • To increase the available solid angle for beam entry with stationary gantries.
  • To match the solid angle capabilities of rotating gantries using novel patient positioning systems.

Main Methods:

  • Development of specialized pods for chest, abdomen, pelvis (CAP), and head and neck (HN) patients.
  • Integration of pods with robotic patient positioners for registration, immobilization, and rotation.
  • Enhancement of registration and immobilization techniques for pod compatibility.
  • Development of ancillary devices for pod management during planning and treatment.

Main Results:

  • Achieved a beam entry solid angle greater than 2π for head patients.
  • Obtained full 360° rotation for CAP patient pods, with supplementary patient positioner rotation.
  • Identified limitations due to collisions with radiation head and imaging systems for CAP patients.
  • Demonstrated that rotating pods with stationary gantries can approximate the solid angle of fully rotating gantries.

Conclusions:

  • Rotating pods offer a viable method to expand beam entry options for stationary gantries.
  • This approach can significantly improve treatment flexibility and potentially outcomes in light ion therapy.
  • Further refinement may overcome positional limitations for certain patient anatomies.