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Commissioning and acceptance guide for the GammaPod.

Stewart Becker1,2, Pouya Sabouri1, Ying Niu3

  • 1Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, MD 21201, United States of America.

Physics in Medicine and Biology
|September 6, 2019
PubMed
Summary

The GammaPod system offers precise stereotactic radiation therapy for breast cancer patients in a prone position. Commissioning confirmed its mechanical, dosimetric, and safety systems meet clinical standards for advanced radiotherapy.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Medical Imaging

Background:

  • Stereotactic radiation therapy for breast cancer requires precise targeting and dose delivery.
  • The GammaPod device utilizes a prone positioning system with continuous couch translation and dynamic beam delivery.
  • Immobilization is achieved using negative pressure and stereotactic fiducials for accuracy.

Purpose of the Study:

  • To report the commissioning process and clinical readiness of the GammaPod system.
  • To validate the mechanical, dosimetric, radiation safety, and interlock subsystems.
  • To establish reliable methods for quality assurance of this novel radiotherapy device.

Main Methods:

  • Commissioning involved detailed testing of mechanical (couch motion, sag), dosimetric (dose calibration, profiles), radiation safety (leakage, surveys), and safety interlock subsystems.
  • Absolute dose rate was determined using the TG-21 dosimetry protocol.
  • Plan verification included comparing treatment planning system data with measurements for beam characteristics.

Main Results:

  • All tested subsystems, including mechanical accuracy and dosimetric parameters, met established criteria.
  • The difference in full-width-at-half-maximum for the 25 mm collimator was within acceptable limits (0.2 mm).
  • Radiation shielding and safety interlocks performed correctly, adhering to regulatory standards.

Conclusions:

  • The commissioning process successfully validated the GammaPod system for clinical implementation.
  • The developed methods ensure the reliable and safe delivery of stereotactic radiation therapy for breast cancer.
  • GammaPod is ready for clinical use in various breast radiotherapy techniques, including boost, partial-breast irradiation, and stereotactic radiosurgery.